Re: Decisions/Choices
Let's keep a perspective here. Whether you wish to accept it or not, we are all members of this list because we agree to the terms of being a member of this list. The administrators can be as dragonian or libertarian as they wish. Thankfully they aren't on both accounts. I think they do a good job as administrators and I think John did a good job as a member. But things happen. I don't know nor do I want to know what happened off-line. But, as far as I'm concerned, John made the decision to leave and left of his own accord. He was not tossed off the list. So with all due respect, email John offline and ask him to come back if you wish. If he does, he does. If he doesn't, then he doesn't. And that's that. But, let's move onto something else, please. Regards, Doug McKean --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: My departure
Well, I must say that I agree with the spirit of what Chris is saying, if not actually with his exact words! I believe that a give and take is healthy; a difference of opinion should not be anathema to this forum. However, we need to remain polite (not rude) and be somewhat sensitive to the various cultural diversities of the members. A digital slap may be fine among a group of friends; it is not appropriate in an international forum where the majority do not know each other. [And who said that engineering is an exact science?-- It all depends how the standard test procedure was written!] taniagr...@msn.com - Original Message - From: Chris Maxwell Sent: Friday, November 16, 2001 10:50 AM To: k.macl...@aprel.com; chris.chile...@ultronics.co.uk; j...@jmwa.demon.co.uk; emc-p...@majordomo.ieee.org Subject: RE: My departure Careful... We're playing with fire here. I don't think the list should be a place for he said---she said..."posturing" contests... I (for one) don't want a justification from the list admins. I wonder why, and I perfectly understand Aprel's curiosity; but I don't want to have it splattered all over the forum. I'm also not going to grovel to get someone back in the group. There is no one person in this world so important that the world will stop for them. If there is any "peacemaking" to be done here, I suggest that John and the admin in question work it out off-line. I suggest that if a third party get involved, that it also be off-line. (I suggest Tania. She'll straighten them out :-)) To me, the best result would be that we all hear nothing more while this gets worked out; then John jumps back into the fray with us. After all, I think that most of his posts are helpful (I must admit that the volley regarding the definitions of tetanus, lock jaw, tetanization... were a drag and probably best left off line) Come on guys (and gals)engineering is fun. People learn by playing. Occasionally people commit "fouls" when they're playing. The game doesn't stop. Warning, the next line is short and to the point, don't read it if you don't want to! (or should that be a "Caution"??? :-)er...ah...whatever Get your craniums out of your rectums (both words were spelled and used correctly) and come back out and play. After all, when you stop learning new tricks, you become an old dog. Chris > -Original Message- > From: k.macl...@aprel.com [SMTP:k.macl...@aprel.com] > Sent: Friday, November 16, 2001 8:40 AM > To: chris.chile...@ultronics.co.uk; j...@jmwa.demon.co.uk; > emc-p...@majordomo.ieee.org > Subject: RE: My departure > > > I agree wholeheartedly with Chris. And I must add that whatever this > "representation" is, it sounds very Draconian to me. Unless John is > secretly an Al-Quaeda operative, I cannot see any reason to force him > off > this group. > > Could we request a justification from the moderators, please. > > Regards to all, > Kate > > > Kathy M. MacLean > President, APREL Laboratories > -EMC-RF Safety-Antenna Design/Test-SAR/MPE-SAR/Near-Field > Tools-Acoustics-Wireless- > 51 Spectrum Way, Nepean, Ontario K2R 1E6 > (613) 820-2730 fax (613) 820-4161 > cell (613) 791-3777 > Web site: http://www.aprel.com - watch for our new web site coming > soon! > > > > > > -Original Message- > From: Chris Chileshe [mailto:chris.chile...@ultronics.co.uk] > Sent: Friday, November 16, 2001 6:04 AM > To: 'John Woodgate'; emc-p...@majordomo.ieee.org > Subject: RE: My departure > > > > > Any possibility of reconsidering your decision John? > > I think it would be a real shame to lose John's presence on the list. > While it would obviously be possible for us to contact him directly > ( and I for one have done so in the past), I have always found it > educational to read John's responses to others' queries, and then > related it all to my own products. > > True, there have been times when some of John's responses have > been somewhat 'direct' and possibly frightening for the uninitiated > newcomer, but a week on the list and you learn to expect responses > like: > > "Surely you don't expect us to replicate the entire scope of EN abc on > this > forum" > > to the less specific queries like: > > "Can someone tell me what EN abc covers" > > but as with all lists it is just a matter of time before you pick up > on the > different personalities, and learn to expect a certain 'tone' from > contributions by the likes of John, The many Chris's, Ken, Bob, Tania, > Rich, > Ed, > Kyle, Amund to mention but a few. One also knows when to expect > responses on IT, Audio, Power, Automotive, Marine, Aerospace etc. > > I would therefore like to appeal to John and the administrator - and > indeed > to Kofi > Annan should he find time in his otherwise busy schedule, to try and > work > this > out for the sake of all of us. > > Thank you. > > - Chris > > > -Original Message- > From: John Woodgate [SMTP:j...@jmwa.demon.co.uk] > Sent:
RE: Pre-amps
David -- you are correct -- the mismatch in the system and antenna factors still remain, regardless of the cable length If the antenna (or whatever load) is not 50 ohms at some frequency, and the source feeding the antenna (or whatever) is 50 ohms at that frequency, a mis-match will exist. Adding 50 ohm cable between the source and load won't change the mis-match, but depending on the cable length, may make the mis-match "look" better or worse from the source end. (Unless, of course, the cable is infinitely long in which case it will look very much better, but normally, the cable length acts as an impedance transformer.) For specific frequencies, one could use the cable as an impedance matching section between the source and load, but this is clearly unusable for broad-band applications. Mike Hopkins -Original Message- From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Friday, November 16, 2001 1:05 PM To: Pommerenke, David; 'ravinder ajmani'; marti...@appliedbiosystems.com Cc: emc-p...@majordomo.ieee.org Subject: Re: Pre-amps Note I am replying to all. What is the measurement inaccuracy associated with a mismatch if the transmission line is vanishingly short (relative to a wavelength)? -- >From: "Pommerenke, David" >To: "'Ken Javor'" , "'Ravinder Ajmani'" , marti...@appliedbiosystems.com >Cc: emc-p...@majordomo.ieee.org >Subject: RE: Pre-amps >Date: Fri, Nov 16, 2001, 8:10 AM > > Dear Ken, > > I am thinking you are missing something (hope that I am correct). > If you simply shorten the cable to zero, the problem of the missmatch, and > the effect of an error that is not corrected for by the antenna factor still > remains. > > David Pommerenke > > -Original Message- > From: Ken Javor [mailto:ken.ja...@emccompliance.com] > Sent: Thursday, November 15, 2001 5:51 PM > To: Pommerenke, David; 'Ravinder Ajmani'; marti...@appliedbiosystems.com > Cc: emc-p...@majordomo.ieee.org > Subject: Re: Pre-amps > > > If input VSWR for preamp and output VSWR for antenna are both bad, then it > seems a simple solution is to connect preamp input to antenna output and let > 50 Ohm output of preamp drive cable, solving two problems at once. Am I > missing something? > > -- >>From: "Pommerenke, David" >>To: "'Ravinder Ajmani'" , marti...@appliedbiosystems.com >>Cc: emc-p...@majordomo.ieee.org >>Subject: RE: Pre-amps >>Date: Thu, Nov 15, 2001, 7:49 AM >> > >> >> On the amps: >> >> For emissions there are the following electrical criteria: >> >> - Noise figure expect about 4 dB for a broadband amp 30 MHz - 2 GHz. >>The noise figure is often larger at the lower frequencies if the >> amplifier goes up to many GHz. >> >> - Input SWR. This is important. Most broadband amps (especially if they > go >> up to many GHz) >>have a bad input match at low frequencies. As the log-per antennas have > a >> bad mismatch too, >>you will have multiple reflections on the cable between the antenna and >> the pre-amp. >>This reflections will influence your measurement and cannot be > corrected >> for by the antenna >>factor. They may be as large as a few dB below 100 MHz. For that > reason, >> you may be forced >>to add a 3 dB attenuatore at the antenna. This increases your noise >> figure by 3 dB. >> >> - Gain. Of course, you need only as much gain as is needed to overcome > the >> cable loss (cable to >>the spectrum analyzer) and the noise figure of the spectrum analyzer. >> More gain will not help >>you. >> >> David Pommerenke >> >> -Original Message- >> From: Ravinder Ajmani [mailto:ajm...@us.ibm.com] >> Sent: Wednesday, November 14, 2001 1:27 PM >> To: marti...@appliedbiosystems.com >> Cc: emc-p...@majordomo.ieee.org >> Subject: Re: Pre-amps >> >> >> >> >> Joe, >> HP (Agilent) make good Pre-amps for different frequency ranges. If you > are >> looking for an economical solution then you may try Com Power Corp. at >> (949) 587-9800. >> >> Regards, Ravinder >> PCB Development and Design Department >> IBM Corporation >> Email: ajm...@us.ibm.com >> > *** >> Always do right. This will gratify some people and astonish the rest. >> Mark Twain >> >> >> >> >> >> MartinJP@appliedbiosyst >> >> ems.com To: >> emc-p...@majordomo.ieee.org >> Sent by: cc: >> >> owner-emc-pstc@majordom Subject: Pre-amps >> >> o.ieee.org >> >> >> >> >> >> 11/14/2001 10:14 AM >> >> Please respond to >> >> MartinJP >> >> >> >> >> >> >> >> >> >> I am having some difficulties locating manufacturers that provide preamps >> with a 20-22dB gain. >> >> What manufacturer/model do you recommend? Why? >> >> Your assistance is appreciated. >> >> Regards >> >> Joe Martin >> Applied Biosystems >> >> >> -
Re: 2.4GHz wireless headphone system
Noop, 2.4GHz falls within EN 300 440 (1GHz-40GHz), EN 300 220 covers frequencies from 25MHz-1GHz, and EN 300 330 covers 9kHz to 25MHz. Has anyone realized that some of the meaurement of EN 300 330 is extremely in-practical? Leslie --- Jacob Schanker wrote: > > Dear KC Chan: > > For the RF standards, take a look at ETSI EN 300 330 > on > Short-range devices (SRD). This is available from > www.etsi.org. > > Also look at ERC Recommendation 70-03 obtainable > from www.ero.dk. > > These should get you started. > > Jacob Z. Schanker, P.E. > 65 Crandon Way > Rochester, NY 14618 > Phone: 716 442 3909 > Fax: 716 442 2182 > j.schan...@ieee.org > > > - Original Message - > From: KC CHAN [PDD] > To: > Sent: Thursday, November 15, 2001 7:53 PM > Subject: 2.4GHz wireless headphone system > > > | > | Dear All > | > | My client is looking for the standards of a 2.4GHz > wireless > headphone system(not a SS product) for EU country. > Would like to > know what is the appropriate EMC and RF standards > under EMC > directive and R&TTE directive. > | > | Thank You > | KC Chan - PDD > | > | > | > | --- > | This message is from the IEEE EMC Society Product > Safety > | Technical Committee emc-pstc discussion list. > | > | Visit our web site at: > http://www.ewh.ieee.org/soc/emcs/pstc/ > | > | To cancel your subscription, send mail to: > | majord...@ieee.org > | with the single line: > | unsubscribe emc-pstc > | > | For help, send mail to the list administrators: > | Michael Garretson: > pstc_ad...@garretson.org > | Dave Heald > davehe...@mediaone.net > | > | For policy questions, send mail to: > | Richard Nute: ri...@ieee.org > | Jim Bacher: j.bac...@ieee.org > | > | All emc-pstc postings are archived and searchable > on the web > at: > | No longer online until our new server is > brought online and > the old messages are imported into the new server. > | > > > --- > This message is from the IEEE EMC Society Product > Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: > http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson: > pstc_ad...@garretson.org > Dave Heald > davehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on > the web at: > No longer online until our new server is brought > online and the old messages are imported into the > new server. __ Do You Yahoo!? Find the one for you at Yahoo! Personals http://personals.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: Decisions/Choices
Dear Colleagues, Today is Friday, seems to me that all of us are very tired, and the last couple of months stressed us more than we expected... In my opinion, the ADMINISTRATORS of this VERY PROFESSIONAL GROUP deserves 100% OUR Respect. The emc-pstc "Discussion List" is like a game: with PLAYERS, with RULES and with REFEREES... It is our choice to play or not, but IF we are playing it, then ALL OF US shall respect the rules, the players and the referees. It was our acceptance when we entered the arena to display an outstanding FAIR PLAY during each and every discussion, and to do not comment any of the referees decisions. It will make the difference between us, and others. I would suggest to close this subject and to continue our discussions on emc and pstc. Have a great weekend everybody. The Life is beautiful ! Enjoy it! Respectfully yours, Constantin Constantin Bolintineanu P.Eng. DIGITAL SECURITY CONTROLS LTD. 3301 LANGSTAFF Road, L4K 4L2 CONCORD, ONTARIO, CANADA e-mail: bolin...@dscltd.com telephone: 905 760 3000 ext 2568 Visit our web site at www.dscgrp.com -Original Message- From: geor...@lexmark.com [mailto:geor...@lexmark.com] Sent: Friday, November 16, 2001 1:19 PM To: Gary McInturff Cc: emc-p...@ieee.org Subject: Decisions/Choices Gary, Thanks for going first! I agree with your comments. The worthy administrators of this forum are charged not only with the day-to-day administration of the forum, but with maintaining the established rules for its use. In some cases they must use some judgement and make tough calls to preserve both the letter and intent of those rules. I have personally received a few off-line notes from time to time suggesting that a particular discussion is a bit outside the intent of the forum. As a participant, I feel this is their call. Each of us subscribes and participates to the degree that we choose. Many of us at one time or another may have offended others, or been offended by others. In any case, the choice to continue one's participation is personal. John has chosen not to participate, as he feels he was offended. This is his choice, and I respect his right to make that choice based on his personal beliefs etc. I am certain that John would feel the same way if someone un-subscribed because they were offended by John. John (if you're still out there), all agree on your technical competence, and willingness to share your expertise. However, the recent onslaught of notes, many of which involved hair-splitting, were beginning to wear on my nerves. I encourage you to rejoin us in this worthwhile exchange of ideas, but cut us a little slack on the hair-splitting. George Alspaugh --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: Pre-amps
I don't understand that. You only get standing waves when a mismatched transmission line is a significant fraction of a wavelength. If the transfer of power from antenna to amplifier is in question, then you could do what another list member suggested: calibrate antenna and amplifier together as a unit. Problem solved. -- >From: "Pommerenke, David" >To: "'Ken Javor'" , "'ravinder ajmani'" , marti...@appliedbiosystems.com >Cc: emc-p...@majordomo.ieee.org >Subject: RE: Pre-amps >Date: Fri, Nov 16, 2001, 12:36 PM > > Ken, > > The added uncertainty is exactly as large as if you have a piece of cable > (assume too short to have relevant losses) inbetween. > > David Pommerenke > > -Original Message- > From: Ken Javor [mailto:ken.ja...@emccompliance.com] > Sent: Friday, November 16, 2001 12:05 PM > To: Pommerenke, David; 'ravinder ajmani'; marti...@appliedbiosystems.com > Cc: emc-p...@majordomo.ieee.org > Subject: Re: Pre-amps > > > Note I am replying to all. What is the measurement inaccuracy associated > with a mismatch if the transmission line is vanishingly short (relative to a > wavelength)? > > -- >>From: "Pommerenke, David" >>To: "'Ken Javor'" , "'Ravinder Ajmani'" > , marti...@appliedbiosystems.com >>Cc: emc-p...@majordomo.ieee.org >>Subject: RE: Pre-amps >>Date: Fri, Nov 16, 2001, 8:10 AM >> > >> Dear Ken, >> >> I am thinking you are missing something (hope that I am correct). >> If you simply shorten the cable to zero, the problem of the missmatch, and >> the effect of an error that is not corrected for by the antenna factor > still >> remains. >> >> David Pommerenke >> >> -Original Message- >> From: Ken Javor [mailto:ken.ja...@emccompliance.com] >> Sent: Thursday, November 15, 2001 5:51 PM >> To: Pommerenke, David; 'Ravinder Ajmani'; marti...@appliedbiosystems.com >> Cc: emc-p...@majordomo.ieee.org >> Subject: Re: Pre-amps >> >> >> If input VSWR for preamp and output VSWR for antenna are both bad, then it >> seems a simple solution is to connect preamp input to antenna output and > let >> 50 Ohm output of preamp drive cable, solving two problems at once. Am I >> missing something? >> >> -- >>>From: "Pommerenke, David" >>>To: "'Ravinder Ajmani'" , > marti...@appliedbiosystems.com >>>Cc: emc-p...@majordomo.ieee.org >>>Subject: RE: Pre-amps >>>Date: Thu, Nov 15, 2001, 7:49 AM >>> >> >>> >>> On the amps: >>> >>> For emissions there are the following electrical criteria: >>> >>> - Noise figure expect about 4 dB for a broadband amp 30 MHz - 2 GHz. >>>The noise figure is often larger at the lower frequencies if the >>> amplifier goes up to many GHz. >>> >>> - Input SWR. This is important. Most broadband amps (especially if they >> go >>> up to many GHz) >>>have a bad input match at low frequencies. As the log-per antennas > have >> a >>> bad mismatch too, >>>you will have multiple reflections on the cable between the antenna > and >>> the pre-amp. >>>This reflections will influence your measurement and cannot be >> corrected >>> for by the antenna >>>factor. They may be as large as a few dB below 100 MHz. For that >> reason, >>> you may be forced >>>to add a 3 dB attenuatore at the antenna. This increases your noise >>> figure by 3 dB. >>> >>> - Gain. Of course, you need only as much gain as is needed to overcome >> the >>> cable loss (cable to >>>the spectrum analyzer) and the noise figure of the spectrum analyzer. >>> More gain will not help >>>you. >>> >>> David Pommerenke >>> >>> -Original Message- >>> From: Ravinder Ajmani [mailto:ajm...@us.ibm.com] >>> Sent: Wednesday, November 14, 2001 1:27 PM >>> To: marti...@appliedbiosystems.com >>> Cc: emc-p...@majordomo.ieee.org >>> Subject: Re: Pre-amps >>> >>> >>> >>> >>> Joe, >>> HP (Agilent) make good Pre-amps for different frequency ranges. If you >> are >>> looking for an economical solution then you may try Com Power Corp. at >>> (949) 587-9800. >>> >>> Regards, Ravinder >>> PCB Development and Design Department >>> IBM Corporation >>> Email: ajm...@us.ibm.com >>> >> > *** >>> Always do right. This will gratify some people and astonish the rest. >>> Mark Twain >>> >>> >>> >>> >>> >>> MartinJP@appliedbiosyst >>> >>> ems.com To: >>> emc-p...@majordomo.ieee.org >>> Sent by: cc: >>> >>> owner-emc-pstc@majordom Subject: Pre-amps >>> >>> o.ieee.org >>> >>> >>> >>> >>> >>> 11/14/2001 10:14 AM >>> >>> Please respond to >>> >>> MartinJP >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> I am having some difficulties locating manufacturers that provide preamps >>> with a 20-22dB gain. >>> >>> What manufacturer/model do you recommend? Why? >>> >>> Your assistance is appreciated. >>> >>> Regards >>>
RE: My departure
I do more listening than talking here... AND I agree with those who do NOT want you to leave!! Daren A. Nerad EMC Consultant / Engineer at Hamilton Sundstrand -Original Message- From: John Woodgate [mailto:j...@jmwa.demon.co.uk] Sent: Thursday, November 15, 2001 3:07 PM To: emc-p...@majordomo.ieee.org Subject: My departure As a result of representations from one of the administrators, which I consider totally unjustified, I am leaving the group. I regret having to break contact with those that responded favourably to my input. You are free to e-mail me if you wish. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Eat mink and be dreary! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Telecommunications Huts
I have a question regarding Telecommunications Huts, NOT the equipment that goes into them, but just the hut itself. I know that the standard for the equipment is GR-63. Telcordia has a standard, GR-43, Generic Requirements for Telecommunications Huts, that I'm waiting for a copy of. Is anyone familiar with this standard? More pointedly, do the huts themselves go through any shake and bake type testing? or other testing? Is anyone aware of an ETSI equivalent for Huts? I'm only interested in above ground, climatically controlled buildings and not remote terminals and such that would be covered by GR-487. Any help would be apreciated and I'll post any info I receive off line. Thanks --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Magnetic Field and Hard Drives
Group, If I am self-certifying and using EN61000-6-2 generic, would a Hard Disk Drive be considered as needing testing to EN61000-4-8? If yes, my equipment is 24vdc powered and the -6-2 standard states testing at the frequencies appropriate to the power supply frequency. So what frequency is DC? (dumb question, right?) Any suggestions.? It seems that the test is really aimed at CRTs which can be impacted by magnetic fields. Anyone with experience that would like to share would be appreciated. Regards, STEVE --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: My departure
I agree with Chris. Chris expressed my opinions better than I could have, and would have, if he hadn't gotten there first. John's detailed responses have been very informative and educational. He must devote a good deal of time to this group. These efforts should be appreciated not deprecated. John's curt responses have been, for the most part - and in my opinion, well deserved. Sometimes a digital "smack upside the head" is OK. Sort of saying "Hulloo - is anybody home in there?" Perhaps the moderators, or policy members will explain just what the group's policies are? This is a very valuable resource, which I thought was working very well - due to the efforts of the administrators, policy folks, and all of the participants. Jack Jacob Z. Schanker, P.E., SMIEEE, FIEAust. 65 Crandon Way Rochester, NY 14618 Phone: 585 442 3909 Fax: 585 442 2182 j.schan...@ieee.org - Original Message - From: Chris Chileshe To: 'John Woodgate' ; Sent: Friday, November 16, 2001 6:04 AM Subject: RE: My departure | | | Any possibility of reconsidering your decision John? | | I think it would be a real shame to lose John's presence on the list. | While it would obviously be possible for us to contact him directly | ( and I for one have done so in the past), I have always found it | educational to read John's responses to others' queries, and then | related it all to my own products. | | True, there have been times when some of John's responses have | been somewhat 'direct' and possibly frightening for the uninitiated | newcomer, but a week on the list and you learn to expect responses | like: | | "Surely you don't expect us to replicate the entire scope of EN abc on this | forum" | | to the less specific queries like: | | "Can someone tell me what EN abc covers" | | but as with all lists it is just a matter of time before you pick up on the | different personalities, and learn to expect a certain 'tone' from | contributions by the likes of John, The many Chris's, Ken, Bob, Tania, Rich, Ed, | Kyle, Amund to mention but a few. One also knows when to expect | responses on IT, Audio, Power, Automotive, Marine, Aerospace etc. | | I would therefore like to appeal to John and the administrator - and indeed to Kofi | Annan should he find time in his otherwise busy schedule, to try and work this | out for the sake of all of us. | | Thank you. | | - Chris | | | -Original Message- | From: John Woodgate [SMTP:j...@jmwa.demon.co.uk] | Sent: Thursday, November 15, 2001 9:07 PM | To: emc-p...@majordomo.ieee.org | Subject: My departure | | | As a result of representations from one of the administrators, which I | consider totally unjustified, I am leaving the group. | | I regret having to break contact with those that responded favourably | to my input. | | You are free to e-mail me if you wish. | -- | Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk | Eat mink and be dreary! | | --- | This message is from the IEEE EMC Society Product Safety | Technical Committee emc-pstc discussion list. | | Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ | | To cancel your subscription, send mail to: | majord...@ieee.org | with the single line: | unsubscribe emc-pstc | | For help, send mail to the list administrators: | Michael Garretson:pstc_ad...@garretson.org | Dave Healddavehe...@mediaone.net | | For policy questions, send mail to: | Richard Nute: ri...@ieee.org | Jim Bacher: j.bac...@ieee.org | | All emc-pstc postings are archived and searchable on the web at: | No longer online until our new server is brought online and the old messages are imported into the new server. | | _ | This message has been checked for all known viruses by Star Internet | delivered through the MessageLabs Virus Scanning Service. For further | information visit http://www.star.net.uk/stats.asp or alternatively call | Star Internet for details on the Virus Scanning Service. | | _ | This message has been checked for all known viruses by Star Internet | delivered through the MessageLabs Virus Scanning Service. For further | information visit http://www.star.net.uk/stats.asp or alternatively call | Star Internet for details on the Virus Scanning Service. | | --- | This message is from the IEEE EMC Society Product Safety | Technical Committee emc-pstc discussion list. | | Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ | | To cancel your subscription, send mail to: | majord...@ieee.org | with the single line: | unsubscribe emc-pstc | | For help, send mail to the list administrators: | Michael Garretson:pstc_ad...@garretson.org | Dave Healddavehe...@mediaone.net |
RE: Pre-amps
Ken, The added uncertainty is exactly as large as if you have a piece of cable (assume too short to have relevant losses) inbetween. David Pommerenke -Original Message- From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Friday, November 16, 2001 12:05 PM To: Pommerenke, David; 'ravinder ajmani'; marti...@appliedbiosystems.com Cc: emc-p...@majordomo.ieee.org Subject: Re: Pre-amps Note I am replying to all. What is the measurement inaccuracy associated with a mismatch if the transmission line is vanishingly short (relative to a wavelength)? -- >From: "Pommerenke, David" >To: "'Ken Javor'" , "'Ravinder Ajmani'" , marti...@appliedbiosystems.com >Cc: emc-p...@majordomo.ieee.org >Subject: RE: Pre-amps >Date: Fri, Nov 16, 2001, 8:10 AM > > Dear Ken, > > I am thinking you are missing something (hope that I am correct). > If you simply shorten the cable to zero, the problem of the missmatch, and > the effect of an error that is not corrected for by the antenna factor still > remains. > > David Pommerenke > > -Original Message- > From: Ken Javor [mailto:ken.ja...@emccompliance.com] > Sent: Thursday, November 15, 2001 5:51 PM > To: Pommerenke, David; 'Ravinder Ajmani'; marti...@appliedbiosystems.com > Cc: emc-p...@majordomo.ieee.org > Subject: Re: Pre-amps > > > If input VSWR for preamp and output VSWR for antenna are both bad, then it > seems a simple solution is to connect preamp input to antenna output and let > 50 Ohm output of preamp drive cable, solving two problems at once. Am I > missing something? > > -- >>From: "Pommerenke, David" >>To: "'Ravinder Ajmani'" , marti...@appliedbiosystems.com >>Cc: emc-p...@majordomo.ieee.org >>Subject: RE: Pre-amps >>Date: Thu, Nov 15, 2001, 7:49 AM >> > >> >> On the amps: >> >> For emissions there are the following electrical criteria: >> >> - Noise figure expect about 4 dB for a broadband amp 30 MHz - 2 GHz. >>The noise figure is often larger at the lower frequencies if the >> amplifier goes up to many GHz. >> >> - Input SWR. This is important. Most broadband amps (especially if they > go >> up to many GHz) >>have a bad input match at low frequencies. As the log-per antennas have > a >> bad mismatch too, >>you will have multiple reflections on the cable between the antenna and >> the pre-amp. >>This reflections will influence your measurement and cannot be > corrected >> for by the antenna >>factor. They may be as large as a few dB below 100 MHz. For that > reason, >> you may be forced >>to add a 3 dB attenuatore at the antenna. This increases your noise >> figure by 3 dB. >> >> - Gain. Of course, you need only as much gain as is needed to overcome > the >> cable loss (cable to >>the spectrum analyzer) and the noise figure of the spectrum analyzer. >> More gain will not help >>you. >> >> David Pommerenke >> >> -Original Message- >> From: Ravinder Ajmani [mailto:ajm...@us.ibm.com] >> Sent: Wednesday, November 14, 2001 1:27 PM >> To: marti...@appliedbiosystems.com >> Cc: emc-p...@majordomo.ieee.org >> Subject: Re: Pre-amps >> >> >> >> >> Joe, >> HP (Agilent) make good Pre-amps for different frequency ranges. If you > are >> looking for an economical solution then you may try Com Power Corp. at >> (949) 587-9800. >> >> Regards, Ravinder >> PCB Development and Design Department >> IBM Corporation >> Email: ajm...@us.ibm.com >> > *** >> Always do right. This will gratify some people and astonish the rest. >> Mark Twain >> >> >> >> >> >> MartinJP@appliedbiosyst >> >> ems.com To: >> emc-p...@majordomo.ieee.org >> Sent by: cc: >> >> owner-emc-pstc@majordom Subject: Pre-amps >> >> o.ieee.org >> >> >> >> >> >> 11/14/2001 10:14 AM >> >> Please respond to >> >> MartinJP >> >> >> >> >> >> >> >> >> >> I am having some difficulties locating manufacturers that provide preamps >> with a 20-22dB gain. >> >> What manufacturer/model do you recommend? Why? >> >> Your assistance is appreciated. >> >> Regards >> >> Joe Martin >> Applied Biosystems >> >> >> --- >> This message is from the IEEE EMC Society Product Safety >> Technical Committee emc-pstc discussion list. >> >> Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ >> >> To cancel your subscription, send mail to: >> majord...@ieee.org >> with the single line: >> unsubscribe emc-pstc >> >> For help, send mail to the list administrators: >> Michael Garretson:pstc_ad...@garretson.org >> Dave Healddavehe...@mediaone.net >> >> For policy questions, send mail to: >> Richard Nute: ri...@ieee.org >> Jim Bacher: j.bac...@ieee.org >> >> All e
Decisions/Choices
Gary, Thanks for going first! I agree with your comments. The worthy administrators of this forum are charged not only with the day-to-day administration of the forum, but with maintaining the established rules for its use. In some cases they must use some judgement and make tough calls to preserve both the letter and intent of those rules. I have personally received a few off-line notes from time to time suggesting that a particular discussion is a bit outside the intent of the forum. As a participant, I feel this is their call. Each of us subscribes and participates to the degree that we choose. Many of us at one time or another may have offended others, or been offended by others. In any case, the choice to continue one's participation is personal. John has chosen not to participate, as he feels he was offended. This is his choice, and I respect his right to make that choice based on his personal beliefs etc. I am certain that John would feel the same way if someone un-subscribed because they were offended by John. John (if you're still out there), all agree on your technical competence, and willingness to share your expertise. However, the recent onslaught of notes, many of which involved hair-splitting, were beginning to wear on my nerves. I encourage you to rejoin us in this worthwhile exchange of ideas, but cut us a little slack on the hair-splitting. George Alspaugh --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: Class C harmonics testing
Master of the Obvious, but it sounds to me like it is an attempt to make the current waveform (to a limited degree) follow the the voltage waveform as opposed to being a sharp spike replenishing a filter cap. -- >From: "KC CHAN [PDD]" >To: >Subject: Class C harmonics testing >Date: Thu, Nov 15, 2001, 9:59 PM > > > For Class C harmonics testing(active input power <= 25 W), one requirement > is as follows > > " the third harmonic current, ...; moreover, the waveform of the input > current shall be such that it begins to flow before or at 60 deg., has its > last peak (if there are several peaks per half period) before or at 65 deg > and does not stop flowing before 90 deg, where the zero crossing of the > fundamental supply voltage is assumed to be at 0 deg" > > Does anyone who can explain what is the purpose of this requirement? And > what is the meaning of stop flowing before 90 deg. > > thank you > > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old > messages are imported into the new server. > --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: Pre-amps
Note I am replying to all. What is the measurement inaccuracy associated with a mismatch if the transmission line is vanishingly short (relative to a wavelength)? -- >From: "Pommerenke, David" >To: "'Ken Javor'" , "'Ravinder Ajmani'" , marti...@appliedbiosystems.com >Cc: emc-p...@majordomo.ieee.org >Subject: RE: Pre-amps >Date: Fri, Nov 16, 2001, 8:10 AM > > Dear Ken, > > I am thinking you are missing something (hope that I am correct). > If you simply shorten the cable to zero, the problem of the missmatch, and > the effect of an error that is not corrected for by the antenna factor still > remains. > > David Pommerenke > > -Original Message- > From: Ken Javor [mailto:ken.ja...@emccompliance.com] > Sent: Thursday, November 15, 2001 5:51 PM > To: Pommerenke, David; 'Ravinder Ajmani'; marti...@appliedbiosystems.com > Cc: emc-p...@majordomo.ieee.org > Subject: Re: Pre-amps > > > If input VSWR for preamp and output VSWR for antenna are both bad, then it > seems a simple solution is to connect preamp input to antenna output and let > 50 Ohm output of preamp drive cable, solving two problems at once. Am I > missing something? > > -- >>From: "Pommerenke, David" >>To: "'Ravinder Ajmani'" , marti...@appliedbiosystems.com >>Cc: emc-p...@majordomo.ieee.org >>Subject: RE: Pre-amps >>Date: Thu, Nov 15, 2001, 7:49 AM >> > >> >> On the amps: >> >> For emissions there are the following electrical criteria: >> >> - Noise figure expect about 4 dB for a broadband amp 30 MHz - 2 GHz. >>The noise figure is often larger at the lower frequencies if the >> amplifier goes up to many GHz. >> >> - Input SWR. This is important. Most broadband amps (especially if they > go >> up to many GHz) >>have a bad input match at low frequencies. As the log-per antennas have > a >> bad mismatch too, >>you will have multiple reflections on the cable between the antenna and >> the pre-amp. >>This reflections will influence your measurement and cannot be > corrected >> for by the antenna >>factor. They may be as large as a few dB below 100 MHz. For that > reason, >> you may be forced >>to add a 3 dB attenuatore at the antenna. This increases your noise >> figure by 3 dB. >> >> - Gain. Of course, you need only as much gain as is needed to overcome > the >> cable loss (cable to >>the spectrum analyzer) and the noise figure of the spectrum analyzer. >> More gain will not help >>you. >> >> David Pommerenke >> >> -Original Message- >> From: Ravinder Ajmani [mailto:ajm...@us.ibm.com] >> Sent: Wednesday, November 14, 2001 1:27 PM >> To: marti...@appliedbiosystems.com >> Cc: emc-p...@majordomo.ieee.org >> Subject: Re: Pre-amps >> >> >> >> >> Joe, >> HP (Agilent) make good Pre-amps for different frequency ranges. If you > are >> looking for an economical solution then you may try Com Power Corp. at >> (949) 587-9800. >> >> Regards, Ravinder >> PCB Development and Design Department >> IBM Corporation >> Email: ajm...@us.ibm.com >> > *** >> Always do right. This will gratify some people and astonish the rest. >> Mark Twain >> >> >> >> >> >> MartinJP@appliedbiosyst >> >> ems.com To: >> emc-p...@majordomo.ieee.org >> Sent by: cc: >> >> owner-emc-pstc@majordom Subject: Pre-amps >> >> o.ieee.org >> >> >> >> >> >> 11/14/2001 10:14 AM >> >> Please respond to >> >> MartinJP >> >> >> >> >> >> >> >> >> >> I am having some difficulties locating manufacturers that provide preamps >> with a 20-22dB gain. >> >> What manufacturer/model do you recommend? Why? >> >> Your assistance is appreciated. >> >> Regards >> >> Joe Martin >> Applied Biosystems >> >> >> --- >> This message is from the IEEE EMC Society Product Safety >> Technical Committee emc-pstc discussion list. >> >> Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ >> >> To cancel your subscription, send mail to: >> majord...@ieee.org >> with the single line: >> unsubscribe emc-pstc >> >> For help, send mail to the list administrators: >> Michael Garretson:pstc_ad...@garretson.org >> Dave Healddavehe...@mediaone.net >> >> For policy questions, send mail to: >> Richard Nute: ri...@ieee.org >> Jim Bacher: j.bac...@ieee.org >> >> All emc-pstc postings are archived and searchable on the web at: >> No longer online until our new server is brought online and the old >> messages are imported into the new server. >> >> >> >> >> >> --- >> This message is from the IEEE EMC Society Product Safety >> Technical Committee emc-pstc discussion list. >> >> Visit our web site at: http://www.ewh.ieee.o
Re: My departure
I second the sentiment, Woodgate is a valuable asset to this forum. -- >From: Chris Chileshe >To: "'John Woodgate'" , "emc-p...@majordomo.ieee.org" >Subject: RE: My departure >Date: Fri, Nov 16, 2001, 5:04 AM > > > > Any possibility of reconsidering your decision John? > > I think it would be a real shame to lose John's presence on the list. > While it would obviously be possible for us to contact him directly > ( and I for one have done so in the past), I have always found it > educational to read John's responses to others' queries, and then > related it all to my own products. > > True, there have been times when some of John's responses have > been somewhat 'direct' and possibly frightening for the uninitiated > newcomer, but a week on the list and you learn to expect responses > like: > > "Surely you don't expect us to replicate the entire scope of EN abc on this > forum" > > to the less specific queries like: > > "Can someone tell me what EN abc covers" > > but as with all lists it is just a matter of time before you pick up on the > different personalities, and learn to expect a certain 'tone' from > contributions by the likes of John, The many Chris's, Ken, Bob, Tania, Rich, Ed, > Kyle, Amund to mention but a few. One also knows when to expect > responses on IT, Audio, Power, Automotive, Marine, Aerospace etc. > > I would therefore like to appeal to John and the administrator - and indeed > to Kofi > Annan should he find time in his otherwise busy schedule, to try and work this > out for the sake of all of us. > > Thank you. > > - Chris > > > -Original Message- > From: John Woodgate [SMTP:j...@jmwa.demon.co.uk] > Sent: Thursday, November 15, 2001 9:07 PM > To: emc-p...@majordomo.ieee.org > Subject: My departure > > > As a result of representations from one of the administrators, which I > consider totally unjustified, I am leaving the group. > > I regret having to break contact with those that responded favourably > to my input. > > You are free to e-mail me if you wish. > -- > Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk > Eat mink and be dreary! > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old > messages are imported into the new server. > > _ > This message has been checked for all known viruses by Star Internet > delivered through the MessageLabs Virus Scanning Service. For further > information visit http://www.star.net.uk/stats.asp or alternatively call > Star Internet for details on the Virus Scanning Service. > > _ > This message has been checked for all known viruses by Star Internet > delivered through the MessageLabs Virus Scanning Service. For further > information visit http://www.star.net.uk/stats.asp or alternatively call > Star Internet for details on the Virus Scanning Service. > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old > messages are imported into the new server. > --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@me
RE: My departure
Careful... We're playing with fire here. I don't think the list should be a place for he said---she said..."posturing" contests... I (for one) don't want a justification from the list admins. I wonder why, and I perfectly understand Aprel's curiosity; but I don't want to have it splattered all over the forum. I'm also not going to grovel to get someone back in the group. There is no one person in this world so important that the world will stop for them. If there is any "peacemaking" to be done here, I suggest that John and the admin in question work it out off-line. I suggest that if a third party get involved, that it also be off-line. (I suggest Tania. She'll straighten them out :-)) To me, the best result would be that we all hear nothing more while this gets worked out; then John jumps back into the fray with us. After all, I think that most of his posts are helpful (I must admit that the volley regarding the definitions of tetanus, lock jaw, tetanization... were a drag and probably best left off line) Come on guys (and gals)engineering is fun. People learn by playing. Occasionally people commit "fouls" when they're playing. The game doesn't stop. Warning, the next line is short and to the point, don't read it if you don't want to! (or should that be a "Caution"??? :-)er...ah...whatever Get your craniums out of your rectums (both words were spelled and used correctly) and come back out and play. After all, when you stop learning new tricks, you become an old dog. Chris > -Original Message- > From: k.macl...@aprel.com [SMTP:k.macl...@aprel.com] > Sent: Friday, November 16, 2001 8:40 AM > To: chris.chile...@ultronics.co.uk; j...@jmwa.demon.co.uk; > emc-p...@majordomo.ieee.org > Subject: RE: My departure > > > I agree wholeheartedly with Chris. And I must add that whatever this > "representation" is, it sounds very Draconian to me. Unless John is > secretly an Al-Quaeda operative, I cannot see any reason to force him > off > this group. > > Could we request a justification from the moderators, please. > > Regards to all, > Kate > > > Kathy M. MacLean > President, APREL Laboratories > -EMC-RF Safety-Antenna Design/Test-SAR/MPE-SAR/Near-Field > Tools-Acoustics-Wireless- > 51 Spectrum Way, Nepean, Ontario K2R 1E6 > (613) 820-2730 fax (613) 820-4161 > cell (613) 791-3777 > Web site: http://www.aprel.com - watch for our new web site coming > soon! > > > > > > -Original Message- > From: Chris Chileshe [mailto:chris.chile...@ultronics.co.uk] > Sent: Friday, November 16, 2001 6:04 AM > To: 'John Woodgate'; emc-p...@majordomo.ieee.org > Subject: RE: My departure > > > > > Any possibility of reconsidering your decision John? > > I think it would be a real shame to lose John's presence on the list. > While it would obviously be possible for us to contact him directly > ( and I for one have done so in the past), I have always found it > educational to read John's responses to others' queries, and then > related it all to my own products. > > True, there have been times when some of John's responses have > been somewhat 'direct' and possibly frightening for the uninitiated > newcomer, but a week on the list and you learn to expect responses > like: > > "Surely you don't expect us to replicate the entire scope of EN abc on > this > forum" > > to the less specific queries like: > > "Can someone tell me what EN abc covers" > > but as with all lists it is just a matter of time before you pick up > on the > different personalities, and learn to expect a certain 'tone' from > contributions by the likes of John, The many Chris's, Ken, Bob, Tania, > Rich, > Ed, > Kyle, Amund to mention but a few. One also knows when to expect > responses on IT, Audio, Power, Automotive, Marine, Aerospace etc. > > I would therefore like to appeal to John and the administrator - and > indeed > to Kofi > Annan should he find time in his otherwise busy schedule, to try and > work > this > out for the sake of all of us. > > Thank you. > > - Chris > > > -Original Message- > From: John Woodgate [SMTP:j...@jmwa.demon.co.uk] > Sent: Thursday, November 15, 2001 9:07 PM > To: emc-p...@majordomo.ieee.org > Subject: My departure > > > As a result of representations from one of the administrators, which I > consider totally unjustified, I am leaving the group. > > I regret having to break contact with those that responded favourably > to my input. > > You are free to e-mail me if you wish. > -- > Regards, John Woodgate, OOO - Own Opinions Only. > http://www.jmwa.demon.co.uk > > Eat mink and be dreary! > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single lin
RE: My departure
Thank God that PC is limited to the US. I'd hate to think that the rest of the world was so narrow minded. Now, if we could just get rid of it! Ghery Pettit -Original Message- From: john.merr...@modicon.com [mailto:john.merr...@modicon.com] Sent: Friday, November 16, 2001 9:18 AM To: John Woodgate Cc: emc-p...@majordomo.ieee.org Subject: Re: My departure John I have appreciated your contributions to this board. Your absence only serves to lower the quality of the technical discussions here. Those that are quick to take offence must remember this is a international forum. "PC" is a US phenomenon and is not the rule for the English speaking world. Regards John Merrill --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: My departure
Rats, I was really hoping to stay out of this particular snit fit but I believe that someone needs to stand up for the list administrators as well. They have a very tough job from many different perspectives technical and unfortunately sociological as well. I haven't a clue what transpired between John and them but I have a great deal of respect for their abilities and hard work in making this work for us all. It would appear that after the conversation John didn't agree with some set of restraints that were discussed so he chose to depart the list but as far as I can tell he wasn't thrown off. I found John to be very knowledgeable, insightful and helpful and a bit acerbic at times but I have probably done the same a time or two, and would certainly like to see him continue, but it appears to be a decision made not an excommunication. Obviously, I wasn't privy to the exchange but given their past efforts I have to assume that the administrators were acting in the best interest of all. I have my asbestos underwear on so please feel free to flame me offline should you desire. Gary -Original Message- From: Brian O'Connell [mailto:boconn...@t-yuden.com] Sent: Friday, November 16, 2001 6:40 AM To: 'John Woodgate'; emc-p...@majordomo.ieee.org Subject: RE: My departure Another fine engineer shot down, in flames, by (yet another) 'PC' byte jockey... Has this become Yet Another Newsgroup/Listserv that "hammers the nail that stands up," and praises mediocrity? My Opinion Only; Nothing to do with my employer's policies. Brian -Original Message- From: John Woodgate [mailto:j...@jmwa.demon.co.uk] Sent: Thursday, November 15, 2001 1:07 PM To: emc-p...@majordomo.ieee.org Subject: My departure As a result of representations from one of the administrators, which I consider totally unjustified, I am leaving the group. I regret having to break contact with those that responded favourably to my input. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: My departure
John I have appreciated your contributions to this board. Your absence only serves to lower the quality of the technical discussions here. Those that are quick to take offence must remember this is a international forum. "PC" is a US phenomenon and is not the rule for the English speaking world. Regards John Merrill --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
SV: My departure
Agree with you, Chris. I hope John will return, I've learned a lot of good safety lessons from him. Amund Fra: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]Pa vegne av Chris Chileshe Sendt: 16. november 2001 12:04 Til: 'John Woodgate'; emc-p...@majordomo.ieee.org Emne: RE: My departure Any possibility of reconsidering your decision John? I think it would be a real shame to lose John's presence on the list. While it would obviously be possible for us to contact him directly ( and I for one have done so in the past), I have always found it educational to read John's responses to others' queries, and then related it all to my own products. True, there have been times when some of John's responses have been somewhat 'direct' and possibly frightening for the uninitiated newcomer, but a week on the list and you learn to expect responses like: "Surely you don't expect us to replicate the entire scope of EN abc on this forum" to the less specific queries like: "Can someone tell me what EN abc covers" but as with all lists it is just a matter of time before you pick up on the different personalities, and learn to expect a certain 'tone' from contributions by the likes of John, The many Chris's, Ken, Bob, Tania, Rich, Ed, Kyle, Amund to mention but a few. One also knows when to expect responses on IT, Audio, Power, Automotive, Marine, Aerospace etc. I would therefore like to appeal to John and the administrator - and indeed to Kofi Annan should he find time in his otherwise busy schedule, to try and work this out for the sake of all of us. Thank you. - Chris -Original Message- From: John Woodgate [SMTP:j...@jmwa.demon.co.uk] Sent: Thursday, November 15, 2001 9:07 PM To: emc-p...@majordomo.ieee.org Subject:My departure As a result of representations from one of the administrators, which I consider totally unjustified, I am leaving the group. I regret having to break contact with those that responded favourably to my input. You are free to e-mail me if you wish. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Eat mink and be dreary! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. _ This message has been checked for all known viruses by Star Internet delivered through the MessageLabs Virus Scanning Service. For further information visit http://www.star.net.uk/stats.asp or alternatively call Star Internet for details on the Virus Scanning Service. _ This message has been checked for all known viruses by Star Internet delivered through the MessageLabs Virus Scanning Service. For further information visit http://www.star.net.uk/stats.asp or alternatively call Star Internet for details on the Virus Scanning Service. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri
Re: My departure
I concur fully with you say, John spends a lot of time answering questions why can he not tell it how it is or at least how he sees it. We are after all professional grown up's. Alan E Hutley Editor EMC Compliance journal - Original Message - From: "Chris Chileshe" To: "'John Woodgate'" ; Sent: Friday, November 16, 2001 11:04 AM Subject: RE: My departure > > > Any possibility of reconsidering your decision John? > > I think it would be a real shame to lose John's presence on the list. > While it would obviously be possible for us to contact him directly > ( and I for one have done so in the past), I have always found it > educational to read John's responses to others' queries, and then > related it all to my own products. > > True, there have been times when some of John's responses have > been somewhat 'direct' and possibly frightening for the uninitiated > newcomer, but a week on the list and you learn to expect responses > like: > > "Surely you don't expect us to replicate the entire scope of EN abc on this > forum" > > to the less specific queries like: > > "Can someone tell me what EN abc covers" > > but as with all lists it is just a matter of time before you pick up on the > different personalities, and learn to expect a certain 'tone' from > contributions by the likes of John, The many Chris's, Ken, Bob, Tania, Rich, Ed, > Kyle, Amund to mention but a few. One also knows when to expect > responses on IT, Audio, Power, Automotive, Marine, Aerospace etc. > > I would therefore like to appeal to John and the administrator - and indeed to Kofi > Annan should he find time in his otherwise busy schedule, to try and work this > out for the sake of all of us. > > Thank you. > > - Chris > > > -Original Message- > From: John Woodgate [SMTP:j...@jmwa.demon.co.uk] > Sent: Thursday, November 15, 2001 9:07 PM > To: emc-p...@majordomo.ieee.org > Subject: My departure > > > As a result of representations from one of the administrators, which I > consider totally unjustified, I am leaving the group. > > I regret having to break contact with those that responded favourably > to my input. > > You are free to e-mail me if you wish. > -- > Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk > Eat mink and be dreary! > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old messages are imported into the new server. > > _ > This message has been checked for all known viruses by Star Internet > delivered through the MessageLabs Virus Scanning Service. For further > information visit http://www.star.net.uk/stats.asp or alternatively call > Star Internet for details on the Virus Scanning Service. > > _ > This message has been checked for all known viruses by Star Internet > delivered through the MessageLabs Virus Scanning Service. For further > information visit http://www.star.net.uk/stats.asp or alternatively call > Star Internet for details on the Virus Scanning Service. > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old messages are imported into the new server. > --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For
Re: 2.4GHz wireless headphone system
Dear KC Chan: For the RF standards, take a look at ETSI EN 300 330 on Short-range devices (SRD). This is available from www.etsi.org. Also look at ERC Recommendation 70-03 obtainable from www.ero.dk. These should get you started. Jacob Z. Schanker, P.E. 65 Crandon Way Rochester, NY 14618 Phone: 716 442 3909 Fax: 716 442 2182 j.schan...@ieee.org - Original Message - From: KC CHAN [PDD] To: Sent: Thursday, November 15, 2001 7:53 PM Subject: 2.4GHz wireless headphone system | | Dear All | | My client is looking for the standards of a 2.4GHz wireless headphone system(not a SS product) for EU country. Would like to know what is the appropriate EMC and RF standards under EMC directive and R&TTE directive. | | Thank You | KC Chan - PDD | | | | --- | This message is from the IEEE EMC Society Product Safety | Technical Committee emc-pstc discussion list. | | Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ | | To cancel your subscription, send mail to: | majord...@ieee.org | with the single line: | unsubscribe emc-pstc | | For help, send mail to the list administrators: | Michael Garretson:pstc_ad...@garretson.org | Dave Healddavehe...@mediaone.net | | For policy questions, send mail to: | Richard Nute: ri...@ieee.org | Jim Bacher: j.bac...@ieee.org | | All emc-pstc postings are archived and searchable on the web at: | No longer online until our new server is brought online and the old messages are imported into the new server. | --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: My departure
C'mon Woody, be a good Brit, put up a stiff upper lip and get back in the game. If you can dish it out, you gotta be able to take it. If you received a private message from one of the administrators, then I'm speaking in total ignorance. If the "representations" are of the public variety which we all have read, then I have seen nothing which I consider "unjustified", just a couple of engineers expressing their own opinions. It's like your byline, OOO - Own Opinons Only. Frank -Original Message- From: John Woodgate [mailto:j...@jmwa.demon.co.uk] Sent: Thursday, November 15, 2001 2:07 PM To: emc-p...@majordomo.ieee.org Subject: My departure As a result of representations from one of the administrators, which I consider totally unjustified, I am leaving the group. I regret having to break contact with those that responded favourably to my input. You are free to e-mail me if you wish. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Eat mink and be dreary! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: Class C harmonics testing
In response to below By definition it is impossible for a third harmonic to create more than two peaks per half cycle and if the distortion is only third harmonic then the peaks can never be separated by more than 45 deg. Even more confusion is created from the ambiguity of the statement which fails to state whether the lag is relating to the voltage or current waveform. a typical example of how not to inform and how to confuse. On behalf Dave Fynn Technical Editor EMC Compliance Journal - Original Message - From: "KC CHAN [PDD]" To: Sent: Friday, November 16, 2001 3:59 AM Subject: Class C harmonics testing > > For Class C harmonics testing(active input power <= 25 W), one requirement is as follows > > " the third harmonic current, ...; moreover, the waveform of the input current shall be such that it begins to flow before or at 60 deg., has its last peak (if there are several peaks per half period) before or at 65 deg and does not stop flowing before 90 deg, where the zero crossing of the fundamental supply voltage is assumed to be at 0 deg" > > Does anyone who can explain what is the purpose of this requirement? And what is the meaning of stop flowing before 90 deg. > > thank you > > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: My departure
I echo Kate's opinion, I think the group deserves to understand what happened so that these things don't happen in the future. Regards Kevin Kevin Keegan KES & Associates - Original Message - From: To: ; ; Sent: Friday, November 16, 2001 8:40 AM Subject: RE: My departure > > I agree wholeheartedly with Chris. And I must add that whatever this > "representation" is, it sounds very Draconian to me. Unless John is > secretly an Al-Quaeda operative, I cannot see any reason to force him off > this group. > > Could we request a justification from the moderators, please. > > Regards to all, > Kate > > > Kathy M. MacLean > President, APREL Laboratories > -EMC-RF Safety-Antenna Design/Test-SAR/MPE-SAR/Near-Field > Tools-Acoustics-Wireless- > 51 Spectrum Way, Nepean, Ontario K2R 1E6 > (613) 820-2730 fax (613) 820-4161 > cell (613) 791-3777 > Web site: http://www.aprel.com - watch for our new web site coming soon! > > > > > > -Original Message- > From: Chris Chileshe [mailto:chris.chile...@ultronics.co.uk] > Sent: Friday, November 16, 2001 6:04 AM > To: 'John Woodgate'; emc-p...@majordomo.ieee.org > Subject: RE: My departure > > > > > Any possibility of reconsidering your decision John? > > I think it would be a real shame to lose John's presence on the list. > While it would obviously be possible for us to contact him directly > ( and I for one have done so in the past), I have always found it > educational to read John's responses to others' queries, and then > related it all to my own products. > > True, there have been times when some of John's responses have > been somewhat 'direct' and possibly frightening for the uninitiated > newcomer, but a week on the list and you learn to expect responses > like: > > "Surely you don't expect us to replicate the entire scope of EN abc on this > forum" > > to the less specific queries like: > > "Can someone tell me what EN abc covers" > > but as with all lists it is just a matter of time before you pick up on the > different personalities, and learn to expect a certain 'tone' from > contributions by the likes of John, The many Chris's, Ken, Bob, Tania, Rich, > Ed, > Kyle, Amund to mention but a few. One also knows when to expect > responses on IT, Audio, Power, Automotive, Marine, Aerospace etc. > > I would therefore like to appeal to John and the administrator - and indeed > to Kofi > Annan should he find time in his otherwise busy schedule, to try and work > this > out for the sake of all of us. > > Thank you. > > - Chris > > > -Original Message- > From: John Woodgate [SMTP:j...@jmwa.demon.co.uk] > Sent: Thursday, November 15, 2001 9:07 PM > To: emc-p...@majordomo.ieee.org > Subject: My departure > > > As a result of representations from one of the administrators, which I > consider totally unjustified, I am leaving the group. > > I regret having to break contact with those that responded favourably > to my input. > > You are free to e-mail me if you wish. > -- > Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk > > Eat mink and be dreary! > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old > messages are imported into the new server. > > _ > This message has been checked for all known viruses by Star Internet > delivered through the MessageLabs Virus Scanning Service. For further > information visit http://www.star.net.uk/stats.asp or alternatively call > Star Internet for details on the Virus Scanning Service. > > _ > This message has been checked for all known viruses by Star Internet > delivered through the MessageLabs Virus Scanning Service. For further > information visit http://www.star.net.uk/stats.asp or alternatively call > Star Internet for details on the Virus Scanning Service. > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send ma
RE: RE: My departure
Although I agree with sentiments expressed so far, I would not be as distressed with John Woodgates departure if he was quickly replaced by someone of equal luminosity such as "JANET WOODHOG" ;-) All kidding aside...I think John should stay (If it matters to the moderators...I am a card-carrying ieee member) -Lauren -- Lauren Crane Product Safety and Regulatory Compliance Engineer/Consultant __ Your favorite stores, helpful shopping tools and great gift ideas. Experience the convenience of buying online with Shop@Netscape! http://shopnow.netscape.com/ Get your own FREE, personal Netscape Mail account today at http://webmail.netscape.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: My departure
John, I was alarmed and saddened to read your posting this morning. I, for one, feel that the loss of your valued input and comments will be sorely missed. I also feel that considering your past contributions to the group, although pointed at times, this action is not warranted. To the adminstrator(s), I sincerely hope this did not come from something petty. And, unless the reason for this action is so unrevocable by violating the Charter and Guidelines of the EMC_PSTC group (I can't see how any of John's posting did that), please keep John and his valued comments and insight with the group. Maybe the adminsitrator(s) would care to share with the group their reasoning for this action. And, whatever the outcome, I, for one, have enjoyed John's knowledgable and insightful postings. John came into the group with a literal bang and IMO, it will be a shame for him to exit the group this way. Sincerely, Ron Pickard rpick...@hypercom.com j...@jmwa.demon.co.uk Sent by: To: emc-p...@majordomo.ieee.org owner-emc-pstc@majordomcc: o.ieee.org Subject: My departure 11/15/01 02:06 PM Please respond to jmw As a result of representations from one of the administrators, which I consider totally unjustified, I am leaving the group. I regret having to break contact with those that responded favourably to my input. You are free to e-mail me if you wish. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Eat mink and be dreary! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: My departure
Thirded (but only for the US :<)). Scott "James, Chris" wrote: > Seconded!! > > Chris James > __ > Chris James > Engineering Services Manager > Dolby Laboratories, Inc. (UK) > www.dolby.com > > -Original Message- > From: Chris Chileshe [mailto:chris.chile...@ultronics.co.uk] > Sent: 16 November 2001 11:04 > To: 'John Woodgate'; emc-p...@majordomo.ieee.org > Subject: RE: My departure > > Any possibility of reconsidering your decision John? > > I think it would be a real shame to lose John's presence on the list. > While it would obviously be possible for us to contact him directly > ( and I for one have done so in the past), I have always found it > educational to read John's responses to others' queries, and then > related it all to my own products. > > True, there have been times when some of John's responses have > been somewhat 'direct' and possibly frightening for the uninitiated > newcomer, but a week on the list and you learn to expect responses > like: > > "Surely you don't expect us to replicate the entire scope of EN abc on this > forum" > > to the less specific queries like: > > "Can someone tell me what EN abc covers" > > but as with all lists it is just a matter of time before you pick up on the > different personalities, and learn to expect a certain 'tone' from > contributions by the likes of John, The many Chris's, Ken, Bob, Tania, Rich, > Ed, > Kyle, Amund to mention but a few. One also knows when to expect > responses on IT, Audio, Power, Automotive, Marine, Aerospace etc. > > I would therefore like to appeal to John and the administrator - and indeed > to Kofi > Annan should he find time in his otherwise busy schedule, to try and work > this > out for the sake of all of us. > > Thank you. > > - Chris > > -Original Message- > From: John Woodgate [SMTP:j...@jmwa.demon.co.uk] > Sent: Thursday, November 15, 2001 9:07 PM > To: emc-p...@majordomo.ieee.org > Subject:My departure > > As a result of representations from one of the administrators, which I > consider totally unjustified, I am leaving the group. > > I regret having to break contact with those that responded favourably > to my input. > > You are free to e-mail me if you wish. > -- > Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk > > Eat mink and be dreary! > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old > messages are imported into the new server. > > _ > This message has been checked for all known viruses by Star Internet > delivered through the MessageLabs Virus Scanning Service. For further > information visit http://www.star.net.uk/stats.asp or alternatively call > Star Internet for details on the Virus Scanning Service. > > _ > This message has been checked for all known viruses by Star Internet > delivered through the MessageLabs Virus Scanning Service. For further > information visit http://www.star.net.uk/stats.asp or alternatively call > Star Internet for details on the Virus Scanning Service. > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old > messages are imported into the new server. > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subs
RE: Conducted emissions - frequencies lower than 150kHz
Is "Minks" the plural for 'Mink' or is it always "Mink" in both singular and plural? Have I been misinformed? Regards - Chris _ This message has been checked for all known viruses by Star Internet delivered through the MessageLabs Virus Scanning Service. For further information visit http://www.star.net.uk/stats.asp or alternatively call Star Internet for details on the Virus Scanning Service. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: My departure
John, Your departure will be loss to this forum, and I hope measures have been taken to offer you the possibility of reconsidering. Thank you for you help in the past, both on and off this forum. Enci --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: Pre-amps
Greetings, I believe David is correct here, the effect of the mismatch between antenna and preamp is still there and so all the available energy from the antenna will not be transferred to the preamp. However, the effects of the length of cable will be gone as with zero length there can be no standing wave. So if the preamp has a pretty good 50 input impedance you will gain nothing by adding a 3dB pad. This could be a trade off if the input impedance is terrible - which has less loss (= lower noise) the 3dB pad and its mismatch losses to both antenna and preamp, or the single antenna to preamp mismatch loss? At least with zero cable it would be a stable value. If different cable lengths are used, the transferred impedance will be also be different meaning that the mismatch losses could well change too. Getting the preamp as close as possible to the antenna is always best I think. With a zero, or very short fixed length cable the measurement set up will be as repeatable as possible while reducing the noise floor. Does this help or confuse? Colin.. -Original Message- From: Pommerenke, David [mailto:davi...@ece.umr.edu] Sent: Friday, November 16, 2001 9:10 AM To: 'Ken Javor'; 'Ravinder Ajmani'; marti...@appliedbiosystems.com Cc: emc-p...@majordomo.ieee.org Subject:RE: Pre-amps Dear Ken, I am thinking you are missing something (hope that I am correct). If you simply shorten the cable to zero, the problem of the missmatch, and the effect of an error that is not corrected for by the antenna factor still remains. David Pommerenke -Original Message- From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Thursday, November 15, 2001 5:51 PM To: Pommerenke, David; 'Ravinder Ajmani'; marti...@appliedbiosystems.com Cc: emc-p...@majordomo.ieee.org Subject: Re: Pre-amps If input VSWR for preamp and output VSWR for antenna are both bad, then it seems a simple solution is to connect preamp input to antenna output and let 50 Ohm output of preamp drive cable, solving two problems at once. Am I missing something? -- >From: "Pommerenke, David" >To: "'Ravinder Ajmani'" , marti...@appliedbiosystems.com >Cc: emc-p...@majordomo.ieee.org >Subject: RE: Pre-amps >Date: Thu, Nov 15, 2001, 7:49 AM > > > On the amps: > > For emissions there are the following electrical criteria: > > - Noise figure expect about 4 dB for a broadband amp 30 MHz - 2 GHz. >The noise figure is often larger at the lower frequencies if the > amplifier goes up to many GHz. > > - Input SWR. This is important. Most broadband amps (especially if they go > up to many GHz) >have a bad input match at low frequencies. As the log-per antennas have a > bad mismatch too, >you will have multiple reflections on the cable between the antenna and > the pre-amp. >This reflections will influence your measurement and cannot be corrected > for by the antenna >factor. They may be as large as a few dB below 100 MHz. For that reason, > you may be forced >to add a 3 dB attenuatore at the antenna. This increases your noise > figure by 3 dB. > > - Gain. Of course, you need only as much gain as is needed to overcome the > cable loss (cable to >the spectrum analyzer) and the noise figure of the spectrum analyzer. > More gain will not help >you. > > David Pommerenke > > -Original Message- > From: Ravinder Ajmani [mailto:ajm...@us.ibm.com] > Sent: Wednesday, November 14, 2001 1:27 PM > To: marti...@appliedbiosystems.com > Cc: emc-p...@majordomo.ieee.org > Subject: Re: Pre-amps > > > > > Joe, > HP (Agilent) make good Pre-amps for different frequency ranges. If you are > looking for an economical solution then you may try Com Power Corp. at > (949) 587-9800. > > Regards, Ravinder > PCB Development and Design Department > IBM Corporation > Email: ajm...@us.ibm.com > *** > Always do right. This will gratify some people and astonish the rest. > Mark Twain > > > > > > MartinJP@appliedbiosyst > > ems.com To: > emc-p...@majordomo.ieee.org > Sent by: cc: > > owner-emc-pstc@majordom Subject: Pre-amps > > o.ieee.org > > > > > > 11/14/2001 10:14 AM > > Please respond to > > MartinJP > > > > > > > > > > I am having some difficulties locating manufacturers that provide preamps > with a 20-22dB gain. > > What manufacturer/model do you recommend? Why? > > Your assistance is appreciated. > > Regards > > Joe Martin > Applied Biosystems > > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > >
RE: My departure
Another fine engineer shot down, in flames, by (yet another) 'PC' byte jockey... Has this become Yet Another Newsgroup/Listserv that "hammers the nail that stands up," and praises mediocrity? My Opinion Only; Nothing to do with my employer's policies. Brian -Original Message- From: John Woodgate [mailto:j...@jmwa.demon.co.uk] Sent: Thursday, November 15, 2001 1:07 PM To: emc-p...@majordomo.ieee.org Subject: My departure As a result of representations from one of the administrators, which I consider totally unjustified, I am leaving the group. I regret having to break contact with those that responded favourably to my input. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: My departure
John, I have enjoyed your contributions to this forum and have learned a few things from you as well. People who find your direct responses to occasionally be offensive have a serious self-image problem and need to lighten up. The purpose of this forum is provide an avenue for the open exchange of knowledge and unique experiences between compliance engineering professionals. I believe you have served this purpose better than most and I hope you re-consider your decision not to participate any longer. Jim Hulbert Senior Engineer - EMC Pitney Bowes --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: Pre-amps
I thought he was referring to this part of your statement... > you will have multiple reflections on the cable between the antenna and > the pre-amp. > This reflections will influence your measurement and cannot be corrected > for by the antenna > factor. thus removing the cable, removes the reflections... not necessarily the mis-matches, just the reflections on the cable. Could the pre-amp-antenna combination be considered a 'unit' for antenna factors ??? - Bill At 09:10 AM 11/16/2001 , Pommerenke, David wrote: Dear Ken, I am thinking you are missing something (hope that I am correct). If you simply shorten the cable to zero, the problem of the missmatch, and the effect of an error that is not corrected for by the antenna factor still remains. David Pommerenke -Original Message- From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Thursday, November 15, 2001 5:51 PM To: Pommerenke, David; 'Ravinder Ajmani'; marti...@appliedbiosystems.com Cc: emc-p...@majordomo.ieee.org Subject: Re: Pre-amps If input VSWR for preamp and output VSWR for antenna are both bad, then it seems a simple solution is to connect preamp input to antenna output and let 50 Ohm output of preamp drive cable, solving two problems at once. Am I missing something? -- >From: "Pommerenke, David" >To: "'Ravinder Ajmani'" , marti...@appliedbiosystems.com >Cc: emc-p...@majordomo.ieee.org >Subject: RE: Pre-amps >Date: Thu, Nov 15, 2001, 7:49 AM > > > On the amps: > > For emissions there are the following electrical criteria: > > - Noise figure expect about 4 dB for a broadband amp 30 MHz - 2 GHz. > The noise figure is often larger at the lower frequencies if the > amplifier goes up to many GHz. > > - Input SWR. This is important. Most broadband amps (especially if they go > up to many GHz) > have a bad input match at low frequencies. As the log-per antennas have a > bad mismatch too, > you will have multiple reflections on the cable between the antenna and > the pre-amp. > This reflections will influence your measurement and cannot be corrected > for by the antenna > factor. They may be as large as a few dB below 100 MHz. For that reason, > you may be forced > to add a 3 dB attenuatore at the antenna. This increases your noise > figure by 3 dB. > > - Gain. Of course, you need only as much gain as is needed to overcome the > cable loss (cable to > the spectrum analyzer) and the noise figure of the spectrum analyzer. > More gain will not help > you. > > David Pommerenke > > -Original Message- > From: Ravinder Ajmani [mailto:ajm...@us.ibm.com] > Sent: Wednesday, November 14, 2001 1:27 PM > To: marti...@appliedbiosystems.com > Cc: emc-p...@majordomo.ieee.org > Subject: Re: Pre-amps > > > > > Joe, > HP (Agilent) make good Pre-amps for different frequency ranges. If you are > looking for an economical solution then you may try Com Power Corp. at > (949) 587-9800. > > Regards, Ravinder > PCB Development and Design Department > IBM Corporation > Email: ajm...@us.ibm.com > *** > Always do right. This will gratify some people and astonish the rest. > Mark Twain > > > > > > MartinJP@appliedbiosyst > > ems.com To: > emc-p...@majordomo.ieee.org > Sent by: cc: > > owner-emc-pstc@majordom Subject: Pre-amps > > o.ieee.org > > > > > > 11/14/2001 10:14 AM > > Please respond to > > MartinJP > > > > > > > > > > I am having some difficulties locating manufacturers that provide preamps > with a 20-22dB gain. > > What manufacturer/model do you recommend? Why? > > Your assistance is appreciated. > > Regards > > Joe Martin > Applied Biosystems > > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson: pstc_ad...@garretson.org > Dave Heald davehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old > messages are imported into the new server. > > > > > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To canc
RE: Pre-amps
Dear Ken, I am thinking you are missing something (hope that I am correct). If you simply shorten the cable to zero, the problem of the missmatch, and the effect of an error that is not corrected for by the antenna factor still remains. David Pommerenke -Original Message- From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Thursday, November 15, 2001 5:51 PM To: Pommerenke, David; 'Ravinder Ajmani'; marti...@appliedbiosystems.com Cc: emc-p...@majordomo.ieee.org Subject: Re: Pre-amps If input VSWR for preamp and output VSWR for antenna are both bad, then it seems a simple solution is to connect preamp input to antenna output and let 50 Ohm output of preamp drive cable, solving two problems at once. Am I missing something? -- >From: "Pommerenke, David" >To: "'Ravinder Ajmani'" , marti...@appliedbiosystems.com >Cc: emc-p...@majordomo.ieee.org >Subject: RE: Pre-amps >Date: Thu, Nov 15, 2001, 7:49 AM > > > On the amps: > > For emissions there are the following electrical criteria: > > - Noise figure expect about 4 dB for a broadband amp 30 MHz - 2 GHz. >The noise figure is often larger at the lower frequencies if the > amplifier goes up to many GHz. > > - Input SWR. This is important. Most broadband amps (especially if they go > up to many GHz) >have a bad input match at low frequencies. As the log-per antennas have a > bad mismatch too, >you will have multiple reflections on the cable between the antenna and > the pre-amp. >This reflections will influence your measurement and cannot be corrected > for by the antenna >factor. They may be as large as a few dB below 100 MHz. For that reason, > you may be forced >to add a 3 dB attenuatore at the antenna. This increases your noise > figure by 3 dB. > > - Gain. Of course, you need only as much gain as is needed to overcome the > cable loss (cable to >the spectrum analyzer) and the noise figure of the spectrum analyzer. > More gain will not help >you. > > David Pommerenke > > -Original Message- > From: Ravinder Ajmani [mailto:ajm...@us.ibm.com] > Sent: Wednesday, November 14, 2001 1:27 PM > To: marti...@appliedbiosystems.com > Cc: emc-p...@majordomo.ieee.org > Subject: Re: Pre-amps > > > > > Joe, > HP (Agilent) make good Pre-amps for different frequency ranges. If you are > looking for an economical solution then you may try Com Power Corp. at > (949) 587-9800. > > Regards, Ravinder > PCB Development and Design Department > IBM Corporation > Email: ajm...@us.ibm.com > *** > Always do right. This will gratify some people and astonish the rest. > Mark Twain > > > > > > MartinJP@appliedbiosyst > > ems.com To: > emc-p...@majordomo.ieee.org > Sent by: cc: > > owner-emc-pstc@majordom Subject: Pre-amps > > o.ieee.org > > > > > > 11/14/2001 10:14 AM > > Please respond to > > MartinJP > > > > > > > > > > I am having some difficulties locating manufacturers that provide preamps > with a 20-22dB gain. > > What manufacturer/model do you recommend? Why? > > Your assistance is appreciated. > > Regards > > Joe Martin > Applied Biosystems > > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old > messages are imported into the new server. > > > > > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is br
RE: My departure
I agree wholeheartedly with Chris. And I must add that whatever this "representation" is, it sounds very Draconian to me. Unless John is secretly an Al-Quaeda operative, I cannot see any reason to force him off this group. Could we request a justification from the moderators, please. Regards to all, Kate Kathy M. MacLean President, APREL Laboratories -EMC-RF Safety-Antenna Design/Test-SAR/MPE-SAR/Near-Field Tools-Acoustics-Wireless- 51 Spectrum Way, Nepean, Ontario K2R 1E6 (613) 820-2730 fax (613) 820-4161 cell (613) 791-3777 Web site: http://www.aprel.com - watch for our new web site coming soon! -Original Message- From: Chris Chileshe [mailto:chris.chile...@ultronics.co.uk] Sent: Friday, November 16, 2001 6:04 AM To: 'John Woodgate'; emc-p...@majordomo.ieee.org Subject: RE: My departure Any possibility of reconsidering your decision John? I think it would be a real shame to lose John's presence on the list. While it would obviously be possible for us to contact him directly ( and I for one have done so in the past), I have always found it educational to read John's responses to others' queries, and then related it all to my own products. True, there have been times when some of John's responses have been somewhat 'direct' and possibly frightening for the uninitiated newcomer, but a week on the list and you learn to expect responses like: "Surely you don't expect us to replicate the entire scope of EN abc on this forum" to the less specific queries like: "Can someone tell me what EN abc covers" but as with all lists it is just a matter of time before you pick up on the different personalities, and learn to expect a certain 'tone' from contributions by the likes of John, The many Chris's, Ken, Bob, Tania, Rich, Ed, Kyle, Amund to mention but a few. One also knows when to expect responses on IT, Audio, Power, Automotive, Marine, Aerospace etc. I would therefore like to appeal to John and the administrator - and indeed to Kofi Annan should he find time in his otherwise busy schedule, to try and work this out for the sake of all of us. Thank you. - Chris -Original Message- From: John Woodgate [SMTP:j...@jmwa.demon.co.uk] Sent: Thursday, November 15, 2001 9:07 PM To: emc-p...@majordomo.ieee.org Subject:My departure As a result of representations from one of the administrators, which I consider totally unjustified, I am leaving the group. I regret having to break contact with those that responded favourably to my input. You are free to e-mail me if you wish. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Eat mink and be dreary! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. _ This message has been checked for all known viruses by Star Internet delivered through the MessageLabs Virus Scanning Service. For further information visit http://www.star.net.uk/stats.asp or alternatively call Star Internet for details on the Virus Scanning Service. _ This message has been checked for all known viruses by Star Internet delivered through the MessageLabs Virus Scanning Service. For further information visit http://www.star.net.uk/stats.asp or alternatively call Star Internet for details on the Virus Scanning Service. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. ---
RE: My departure
Seconded!! Chris James __ Chris James Engineering Services Manager Dolby Laboratories, Inc. (UK) www.dolby.com -Original Message- From: Chris Chileshe [mailto:chris.chile...@ultronics.co.uk] Sent: 16 November 2001 11:04 To: 'John Woodgate'; emc-p...@majordomo.ieee.org Subject: RE: My departure Any possibility of reconsidering your decision John? I think it would be a real shame to lose John's presence on the list. While it would obviously be possible for us to contact him directly ( and I for one have done so in the past), I have always found it educational to read John's responses to others' queries, and then related it all to my own products. True, there have been times when some of John's responses have been somewhat 'direct' and possibly frightening for the uninitiated newcomer, but a week on the list and you learn to expect responses like: "Surely you don't expect us to replicate the entire scope of EN abc on this forum" to the less specific queries like: "Can someone tell me what EN abc covers" but as with all lists it is just a matter of time before you pick up on the different personalities, and learn to expect a certain 'tone' from contributions by the likes of John, The many Chris's, Ken, Bob, Tania, Rich, Ed, Kyle, Amund to mention but a few. One also knows when to expect responses on IT, Audio, Power, Automotive, Marine, Aerospace etc. I would therefore like to appeal to John and the administrator - and indeed to Kofi Annan should he find time in his otherwise busy schedule, to try and work this out for the sake of all of us. Thank you. - Chris -Original Message- From: John Woodgate [SMTP:j...@jmwa.demon.co.uk] Sent: Thursday, November 15, 2001 9:07 PM To: emc-p...@majordomo.ieee.org Subject:My departure As a result of representations from one of the administrators, which I consider totally unjustified, I am leaving the group. I regret having to break contact with those that responded favourably to my input. You are free to e-mail me if you wish. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Eat mink and be dreary! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. _ This message has been checked for all known viruses by Star Internet delivered through the MessageLabs Virus Scanning Service. For further information visit http://www.star.net.uk/stats.asp or alternatively call Star Internet for details on the Virus Scanning Service. _ This message has been checked for all known viruses by Star Internet delivered through the MessageLabs Virus Scanning Service. For further information visit http://www.star.net.uk/stats.asp or alternatively call Star Internet for details on the Virus Scanning Service. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.ne
RE: 2.4GHz wireless headphone system
If the product fits the definition of a Short Range Device, the following ETSI standards apply: EN 300 440-1 EN 300 440-2 EN 301 489-1 EN 301 489-? check which one of the series applies to your product You can download the standard from the ETSI web site for free. Richard Woods Sensormatic Electronics Tyco International -Original Message- From: KC CHAN [PDD] [mailto:kcc...@hkpc.org] Sent: Thursday, November 15, 2001 7:53 PM To: emc-p...@majordomo.ieee.org Subject: 2.4GHz wireless headphone system Dear All My client is looking for the standards of a 2.4GHz wireless headphone system(not a SS product) for EU country. Would like to know what is the appropriate EMC and RF standards under EMC directive and R&TTE directive. Thank You KC Chan - PDD --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: My departure
Any possibility of reconsidering your decision John? I think it would be a real shame to lose John's presence on the list. While it would obviously be possible for us to contact him directly ( and I for one have done so in the past), I have always found it educational to read John's responses to others' queries, and then related it all to my own products. True, there have been times when some of John's responses have been somewhat 'direct' and possibly frightening for the uninitiated newcomer, but a week on the list and you learn to expect responses like: "Surely you don't expect us to replicate the entire scope of EN abc on this forum" to the less specific queries like: "Can someone tell me what EN abc covers" but as with all lists it is just a matter of time before you pick up on the different personalities, and learn to expect a certain 'tone' from contributions by the likes of John, The many Chris's, Ken, Bob, Tania, Rich, Ed, Kyle, Amund to mention but a few. One also knows when to expect responses on IT, Audio, Power, Automotive, Marine, Aerospace etc. I would therefore like to appeal to John and the administrator - and indeed to Kofi Annan should he find time in his otherwise busy schedule, to try and work this out for the sake of all of us. Thank you. - Chris -Original Message- From: John Woodgate [SMTP:j...@jmwa.demon.co.uk] Sent: Thursday, November 15, 2001 9:07 PM To: emc-p...@majordomo.ieee.org Subject:My departure As a result of representations from one of the administrators, which I consider totally unjustified, I am leaving the group. I regret having to break contact with those that responded favourably to my input. You are free to e-mail me if you wish. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Eat mink and be dreary! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. _ This message has been checked for all known viruses by Star Internet delivered through the MessageLabs Virus Scanning Service. For further information visit http://www.star.net.uk/stats.asp or alternatively call Star Internet for details on the Virus Scanning Service. _ This message has been checked for all known viruses by Star Internet delivered through the MessageLabs Virus Scanning Service. For further information visit http://www.star.net.uk/stats.asp or alternatively call Star Internet for details on the Virus Scanning Service. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: CE-mark compliance
John We often come across large systems or machines where we ask the manufacturer for certification details for the components, they sometimes are unable to get much information from their suppliers, a common example is for transformers where it is unlikely that they have been tested, except as an end of line production test and are only supplied with a DOC. We do not accept these but are always asked. I am sorry to hear that you are leaving this forum. My feeling is that your input was extremely useful and it will be missed (where do you get the time to do the research, or is it all in your head). It is particularly useful to have somebody on standards committees to show us all how it works. Regards Glenn Moffat TUV International UK Tel: +44 121 634 8000 Fax: +44 121 634 8080 I read in !emc-pstc that i...@uk.tuv.com wrote (in ) about 'CE-mark compliance', on Thu, 15 Nov 2001: > Test houses generally do >not accept a Declaration of Conformity for any product unless further proof >is available in the form of acceptable test results (from a 3rd party >laboratory or approved in-house laboratory). There is normally no reason for a test house to be asked to 'accept' a DOC, unless the manufacturer commissions it to use the DOC to support a claim of conformity to some other requirements, such as Australian. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Eat mink and be dreary! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Correct submissions
Group, If a piece of telecoms equipment has the facility to use for example a headset that is not supplied with the product, for emc purposes it is necessary to perform conducted and radiated Immunity with a head set, however I have sampled 5 different headsets on the market (there are many more out there) with dramatic differences to the 1Khz demodulated tone on the line and acoustic (some have a comfortable pass, some fail). With this in mind how would an EMC submission be handled. Jon Jones Senior Approvals Engineer --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: My departure
John, you must do what you must do but I for one will be sorry to see you leave. Bob Heller 3M Product Safety, 76-1-01 St. Paul, MN 55107-1208 Tel: 651- 778-6336 Fax: 651-778-6252 === John Woodgate cc: (bcc: Robert E. Heller/US-Corporate/3M/US) Subject: My departure 11/15/2001 03:06 PM Please respond to John Woodgate As a result of representations from one of the administrators, which I consider totally unjustified, I am leaving the group. I regret having to break contact with those that responded favourably to my input. You are free to e-mail me if you wish. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Eat mink and be dreary! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Class C harmonics testing
For Class C harmonics testing(active input power <= 25 W), one requirement is as follows " the third harmonic current, ...; moreover, the waveform of the input current shall be such that it begins to flow before or at 60 deg., has its last peak (if there are several peaks per half period) before or at 65 deg and does not stop flowing before 90 deg, where the zero crossing of the fundamental supply voltage is assumed to be at 0 deg" Does anyone who can explain what is the purpose of this requirement? And what is the meaning of stop flowing before 90 deg. thank you --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
2.4GHz wireless headphone system
Dear All My client is looking for the standards of a 2.4GHz wireless headphone system(not a SS product) for EU country. Would like to know what is the appropriate EMC and RF standards under EMC directive and R&TTE directive. Thank You KC Chan - PDD --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: Conducted emisions - frequencies lower than 150kHz
Minks are members of the weasel family. Ever smell a weasel or an undescented ferret? -- >From: "Nerad, DarenHS-SNS" >To: "'John Woodgate'" , emc-p...@majordomo.ieee.org >Subject: RE: Conducted emisions - frequencies lower than 150kHz >Date: Thu, Nov 15, 2001, 2:11 PM > > > Why not eat mink? > What do they do with the meat from the minks raised for their fur? > Although, I speak without first hand knowledge, I've heard the only part of > the pig they don't use is the squeal! (in particular on farms) > > Daren A. Nerad > EMC Engineer > Consultant at > Hamilton Sundstrand > 815.226.6123 > > > -Original Message- > From: John Woodgate [mailto:j...@jmwa.demon.co.uk] > Sent: Thursday, November 15, 2001 2:34 AM > To: emc-p...@majordomo.ieee.org > Subject: Re: Conducted emisions - frequencies lower than 150kHz > > > > I read in !emc-pstc that bogdan matoga wrote (in > <3bf31b67.a7262...@pacbell.net>) about 'Conducted emisions - frequencies > lower than 150kHz', on Wed, 14 Nov 2001: >>John: Why would you want to eat mink? > > The tag is a false Spoonerism (rearrangement of initial letters for > humorous (?) effect) of 'Eat, drink and be merry!' > > Time for a new tag, I think. Watch the space below.(;-) > -- > Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk > > Eat mink and be dreary! > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old > messages are imported into the new server. > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old > messages are imported into the new server. > --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: Pre-amps
If input VSWR for preamp and output VSWR for antenna are both bad, then it seems a simple solution is to connect preamp input to antenna output and let 50 Ohm output of preamp drive cable, solving two problems at once. Am I missing something? -- >From: "Pommerenke, David" >To: "'Ravinder Ajmani'" , marti...@appliedbiosystems.com >Cc: emc-p...@majordomo.ieee.org >Subject: RE: Pre-amps >Date: Thu, Nov 15, 2001, 7:49 AM > > > On the amps: > > For emissions there are the following electrical criteria: > > - Noise figure expect about 4 dB for a broadband amp 30 MHz - 2 GHz. >The noise figure is often larger at the lower frequencies if the > amplifier goes up to many GHz. > > - Input SWR. This is important. Most broadband amps (especially if they go > up to many GHz) >have a bad input match at low frequencies. As the log-per antennas have a > bad mismatch too, >you will have multiple reflections on the cable between the antenna and > the pre-amp. >This reflections will influence your measurement and cannot be corrected > for by the antenna >factor. They may be as large as a few dB below 100 MHz. For that reason, > you may be forced >to add a 3 dB attenuatore at the antenna. This increases your noise > figure by 3 dB. > > - Gain. Of course, you need only as much gain as is needed to overcome the > cable loss (cable to >the spectrum analyzer) and the noise figure of the spectrum analyzer. > More gain will not help >you. > > David Pommerenke > > -Original Message- > From: Ravinder Ajmani [mailto:ajm...@us.ibm.com] > Sent: Wednesday, November 14, 2001 1:27 PM > To: marti...@appliedbiosystems.com > Cc: emc-p...@majordomo.ieee.org > Subject: Re: Pre-amps > > > > > Joe, > HP (Agilent) make good Pre-amps for different frequency ranges. If you are > looking for an economical solution then you may try Com Power Corp. at > (949) 587-9800. > > Regards, Ravinder > PCB Development and Design Department > IBM Corporation > Email: ajm...@us.ibm.com > *** > Always do right. This will gratify some people and astonish the rest. > Mark Twain > > > > > > MartinJP@appliedbiosyst > > ems.com To: > emc-p...@majordomo.ieee.org > Sent by: cc: > > owner-emc-pstc@majordom Subject: Pre-amps > > o.ieee.org > > > > > > 11/14/2001 10:14 AM > > Please respond to > > MartinJP > > > > > > > > > > I am having some difficulties locating manufacturers that provide preamps > with a 20-22dB gain. > > What manufacturer/model do you recommend? Why? > > Your assistance is appreciated. > > Regards > > Joe Martin > Applied Biosystems > > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old > messages are imported into the new server. > > > > > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old > messages are imported into the new server. > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson:pstc_ad
