RE: NSA fun
Have you tried ferrites on the tx coax? Also move the tx coax around, I'll bet it will be worked out with coax placement? Michael Sundstrom NOKIA TCC Dallas / EMC of: (972) 374-1462 cell: (817) 917-5021 amateur call: KB5UKT From: ext John Harrington [mailto:jharring...@f2labs.com] Sent: Thursday, September 18, 2003 2:06 PM To: emc-p...@ieee.org Subject: NSA fun Hello All I'm having some fun with an NSA measurement. I get a swing of 8dB between 30MHz and 45MHz horizontally polarized. At 30 MHz I get too little attenuation (i.e. I receive too much of the transmitted signal) and at 45MHz too much attenuation. The rest of the frequency range is good within +/-2dB and the Vertical polarization is good at all frequencies. Are there any OATS Gurus out there who could shed some light on this or at least suggest an illuminating text? Thanks John Harrington 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
FW: FCC's inquiry for broadband over the powerlines (BPL)
From: Sundstrom Michael (NMP-RD/Dallas) Sent: Friday, July 18, 2003 7:34 AM To: 'Garnier, David S (MED)' Subject: RE: FCC's inquiry for broadband over the powerlines (BPL) I'd say that the noise floor from 2 to 40 MHz is going to rise due to the broad band noise that could be generated from the unshielded transmission path. This is just a guess, after all; pumping power down unlimited length antennas will probably radiate. Michael Sundstrom NOKIA TCC Dallas / EMC of: (972) 374-1462 cell: (817) 917-5021 amateur call: KB5UKT From: ext Garnier, David S (MED) [mailto:david.garn...@med.ge.com] Sent: Thursday, July 17, 2003 6:38 PM To: emc-p...@majordomo.ieee.org Subject: FCC's inquiry for broadband over the powerlines (BPL) Hello, I don't remember seeing any discussion on the listserve concerning this... As I understand this, this is a carrier current system, digital modulation format, frquencies ranging from 2 to 40 Mhz, amplitude limits of ~40 dB to 60 dB above Class A conducted emission limits. Anybody have any experiance or comments about this? For further explanation see: http://hraunfoss.fcc.gov/edocs_public/SilverStream/Pages/edocs.html Use the search term: broadband over power line thanks, dave garnier David Garnier e GE Medical Systems ___ David S. Garnier Senior Technician PET Engineering 3000 N. Grandview Ave - M/S W-1250 Waukesha, Wi. 53188 Tel: 262.312.7246 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: Surge Suppressors on a UPS
Ed, I also hate it when I get ambushed. In the matter of the extension cord: I guess to lessen their liability they don't want any extra voltage drop from a cord? I also agree, why would I hook up a UPS that could fry my equipment with a switching event? When you find out let me know, as this sounds like something I need to know! Michael Sundstrom NOKIA TCC Dallas / EMC of: (972) 374-1462 cell: (817) 917-5021 amateur call: KB5UKT From: ext Price, Ed [mailto:ed.pr...@cubic.com] Sent: Monday, June 02, 2003 10:19 AM To: 'EMC-PSTC List' Subject: Surge Suppressors on a UPS Hi Group! Last Friday, I got ambushed in a meeting. I hate it when that happens! A question was asked about whether it's OK to put a surge suppressor on the output of a UPS that is supplying power to some expensive equipment. I opined that I didn't think it should be necessary, but that it also shouldn't hurt anything either. So then somebody asks me why all the UPS manufacturer's sites say not to use a surge suppressor. I expertly reply that gosh, I don't know, but I'll take a look. The next question nails me again. Are there any standards for UPS output power quality? Uh, well, I'll look into that too. Now, the market is light industrial, USA, but are there any applicable EN standards also? Just for some background, here's a typical entry from Tripp-Lite's FAQ list for UPS's (not to pick on Tripp-Lite; they just said it most succinctly of several sites I looked at): http://www.tripplite.com/support/faq/tech_ups.cfm Can I plug a surge suppressor or extension cord into my UPS? No. Using an extension cord will void your equipment coverage warranty, as all equipment must be plugged directly into the UPS. Tripp Lite does not recommend plugging a surge protector into a battery backup outlet of a UPS either as this can overload it. Also, when some UPS systems switch to battery power they will output a waveform that a surge suppressor may see as a surge and short-circuit the UPS. Again, this setup will void the equipment coverage warranty. Now this is getting to be a big can of worms! What do they mean by some UPS? Is there one kind that does, and another kind that doesn't; and how do you know which is which? And if some UPS will create a voltage transient (is that what they mean?) sufficient to trigger a surge suppressor, then why is it OK to let the UPS apply that transient to my protected equipment? All this talk about uninterrupted power isn't worth anything if the UPS kills my equipment when it switches to battery power mode. And who's fault is this? I mean, a surge suppressor is pretty dumb; it just sits there waiting for the voltage to go over a certain level and then it conducts. What's this about the surge suppressor may see something as a surge? That's saying the surge suppressor could mis-interpret the waveform it sees. If the surge suppressor is conducting, then I think the UPS has just done something very naughty. I also don't understand the prohibition of an extension cord. Maybe this is a legal issue, as I can't see any valid safety or regulation issues here. We regularly put a UPS in the bottom of a rack system, and then wire a stripline outlet set for the height of the rack. Isn't that the electrical equivalent of an extension cord? What am I missing? Thanks in advance! Ed Ed Price ed.pr...@cubic.com NARTE Certified EMC Engineer Technician Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (Fax) Military Avionics EMC Is Our Specialty
RE: Repeat and late messages?
Yes I'm seeing some strange posts also. Michael Sundstrom NOKIA TCC Dallas / EMC of: (972) 374-1462 cell: (817) 917-5021 amateur call: KB5UKT From: ext k.macl...@aprel.com [mailto:k.macl...@aprel.com] Sent: Wednesday, April 23, 2003 1:28 PM To: emc-p...@ieee.org Subject: Repeat and late messages? Folks - Is it just me, or have others noticed large (days) delays in the appearance of some posts, as well as random duplications? Cheers, Kate Kathy M. MacLean President, APREL Laboratories -EMC-RF Safety-Antenna Design/Test-SAR/Near-Field Tools-Acoustics-Wireless-SAR/MPE 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! 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: Real product interference source at 121 MHz
This is a multi-part message in MIME format. 121.5 MHz is the emergency com channel and the ELT alert channel for aviation. Might be bleed over? Michael Sundstrom NOKIA TCC Dallas / EMC of: (972) 374-1462 cell: (817) 917-5021 amateur call: KB5UKT ---BeginMessage--- This attachment, originally named Message Text, was removed because it is zero length. ---End Message---
