Re: Can someone identify this ferrite?
Tania, I'll add to Tony's comment, that not only the material, but sometimes its physical configuration make a difference. For example, one large firm makes a ferrite SM device with superior impedance down to about 10 MHz. EVERYONE can make 100 MHz devices... but the patented construction of this one makes it useful at lower frequencies as well. In any case, I'd not rely too much on results from one sample, as that may be from one especially good batch. In fact, if you have any control over the design, I'd think it would be smarter to plan on using beads that are not quite as good (but _are_ more available) for production. That might take a couple of extra capacitors, somewhere, but it would prevent sole-sourcing and depending on one firm's idea of QC. Cortland == Original Message Follows >> Date: 10-Apr-97 20:11:09 MsgID: 1047-63432 ToID: 72146,373 From: INTERNET:tania.gr...@octel.com >INTERNET:tania.gr...@octel.com Subj: Can someone identify this ferrite? Chrg: $0.00 Imp: Norm Sens: StdReceipt: NoParts: 1 While performing emission testing, we have discovered that a certain ferrite performed better than some others, however, we cannot identify the source. It is a standard issue, almost square, clamshell type housing to be used with a cable approximately 10 mm diameter, with an outer off-white plastic case with the following markings: KG (italics) inside a rectangle, molded on one side SFC-10 sticky-on white label on the other side If anyone is familiar with this type, I would be most grateful if you could identify it. Thank you. Tania Grant, Octel Communications Corporation tania.gr...@octel.com == End of Original Message =
Dipole antenna factors below 80 MHz
Greetings, When making field strength measurements below 80 MHz, CISPR 22 says to tune the antenna to the 80 MHz resonant length. Should the antenna be calibrated at these frequencies with the 80MHz resonant length? Or does one use the antenna factors that were presumably derived using the actual resonant length? I can find no guidance in published standards on this subject. Thanks in advance, Bob Sykes EMC Engineer Gilbarco Inc. bob_sy...@gilbarco.com
RE: Can someone identify this ferrite?
Hi Tania, I am 99% sure this is a Japanese company/distributor. I have a sample bag of similar parts and there is Japanese kanji on the bag so that is a tip-off. Unfortunately, there is no more info on the bag. I don't think that any one company has a material that is that much more special than the others. But there are different materials that can significantly affect ferrite performance, and you need to choose the right one for the frequency to be attenuated. Typically, people use type 43 (from Fair-Rite) which is very similar in performance to type 28 (from Steward). These materials are optimized for lower frequency use (30 MHz to 200 MHz). If you are trying to attenuate higher frequencies, there is the less commonly used type 61 (Fair-Rite) which is similar to type 25 (Steward). These alternate materials are better optimized to the frequency range of 200 MHz to 500 MHz. If you have trouble sourcing the KG part, you may want to consider the above materials in a split bead (clamshell construction) that is similarly sized to the KG or larger. I would suspect that either 43/28 or 61/25, appropriately sized should work. And they are readily available through a number of distributors. Good luck. tony_fredriks...@netpower.com -- From: tania.grant To: emc-pstc Subject: Can someone identify this ferrite? List-Post: emc-pstc@listserv.ieee.org Date: Thursday, April 10, 1997 7:02PM While performing emission testing, we have discovered that a certain ferrite performed better than some others, however, we cannot identify the source. It is a standard issue, almost square, clamshell type housing to be used with a cable approximately 10 mm diameter, with an outer off-white plastic case with the following markings: KG (italics) inside a rectangle, molded on one side SFC-10 sticky-on white label on the other side If anyone is familiar with this type, I would be most grateful if you could identify it. Thank you. Tania Grant, Octel Communications Corporation tania.gr...@octel.com
Re: Can someone identify this ferrite?
Phil, KG parts are supplied in the US by: IM Intermark (USA), Inc One Penn Plaza-Suite 4526 New York, NY 10119-0001 (212) 629-3620 (212) 967-3948 fax The person I deal with is Cristian Radu (Sales Engineer). Hope this helps, Brian Kunde LECO Corp. Tania, It sounds like a Kitagawa SFC-10. Sorry I can't help if you need a US- based supplier but they are easily available here in UK, so I doubt you will have a problem. Regards, PFORD at HVTVM GBXYR7PW at IBMMAIL Phillip Ford phil_f...@uk.xyratex.com ext 3255 tel:+44 (0)1705 443255 fax:+44 (0)1705 499315 Engineering Lab, 871/24-22X Y R A T E X *** Forwarding note from I1467402--IBMMAIL 11/04/97 06:30 *** From: tania.gr...@octel.com List-Post: emc-pstc@listserv.ieee.org Date: Thu, 10 Apr 1997 19:02:27 -0700 Subject: Can someone identify this ferrite? To: emc-p...@majordomo.ieee.org While performing emission testing, we have discovered that a certain ferrite performed better than some others, however, we cannot identify the source. It is a standard issue, almost square, clamshell type housing to be used with a cable approximately 10 mm diameter, with an outer off-white plastic case with the following markings: KG (italics) inside a rectangle, molded on one side SFC-10 sticky-on white label on the other side If anyone is familiar with this type, I would be most grateful if you could identify it. Thank you. Tania Grant, Octel Communications Corporation tania.gr...@octel.com End of mail text Additional SMTP headers from original mail item follow: Received: from ruebert.ieee.org by E-MAIL.COM (IBM VM SMTP V2R3) with TCP; Fri, 11 Apr 97 01:28:47 EDT Received: (from daemon@localhost) by ruebert.ieee.org (8.7.5/8.7.3) id WAA02000 for emc-pstc-list; Thu, 10 Apr 1997 22:08:54 -0400 (EDT) Mime-Version: 1.0 Message-Id: <00056659.3...@corp.octel.com> Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Description: cc:Mail note part Sender: owner-emc-p...@majordomo.ieee.org Precedence: bulk Reply-To: tania.gr...@octel.com X-Resent-To: Multiple Recipients X-Listname: emc-pstc X-List-Description: Product Safety Tech. Committee, EMC Society X-Info: Help requests to emc-pstc-requ...@majordomo.ieee.org X-Info: YUn?Subscribe requests to majord...@majordomo.ieee.org X-Moderator-Address: emc-pstc-appro...@majordomo.ieee.org
RE: European Directives
Doug & Arthur The website suggested by Doug is a good one but .. Beware! The contents are identified as those published in the OJ as of 1 January 96. That's "long-long-ago" in the world of conformity assessment. I'm not aware of any other, authoritive and public compilation of the information you seek (although several private sources do publish this information for a fee). Compliance Engineering Magazine (CE) does print a list occasionally, but it is not in the current issue. Regards, Art Michael, Editor * * * * * * * * * * * * * * * * * * * * * * * International Product Safety News * *Check out our current offer on the * * Safety Link at http://www.safetylink.com * * * * * * * * * * * * * * * * * * * * * * * On Fri, 11 Apr 1997, Frazee, Doug wrote: > A complete listing of European Directives is available, as well as > harmonized standards applicable to each directive > at: http://www2.echo.lu/nasd/ > > Doug Frazee > EMC Compliance Engineer > Alliant Techsystems, Inc. > Advanced Technology Applications > 401 Defense Highway > Annapolis, Maryland 21401 > USA > Tel: (410) 266-1793 > FAX: (410) 266-1853 > doug_fra...@atk.com > -- > From: Arthur Poolton (MEPCD)[SMTP:arth...@apricot.mee.com] > Sent: Friday, April 04, 1997 9:22 AM > To: 'emc-p...@ieee.org' > Subject: European Directives > > Hi, > >Does anyone out there know where I would be able to obtain a > >comprehensive listing of ALL European Directives in force and impending > >please ? > > > >Arthur Poolton > >Approvals Manager > >Mitsubishi Electric - PC Division (Apricot Computers Limited) > > > >
Re: TREG or EMC-PSTC
Tom, for me, you are asking the wrong questions, but than that is for me. I am interested only in "general" regulatory and compliance issues, which is a field of its own in our global community. I don't have time to read all the good stuff from the techies on how they diddle modems to pass the UK requirements. I'm not saying that is not good and worthwhile stuff, but if you're trying to track the global regulations for Information and Communications Technology equipment, than these details become chaff in the wind. You don't have time for it. I found that the EMC-PS forum had too much technical detail and not enough information to make it worth my while. I'm getting to a point where I start questioning the value of the TREG, if the trend for going down technical ratholes continues. Once again, I'm not saying that the technical stuff is not valuable, to the contrary, in the days that I had to get approvals for stuff, that would have been an invaluable source. It is just that the, what I call "electro-political" part of this business has grown to a size that does notpermit sidetracking on finer technical points any longer. Hence your questionaire poses a problem for me. I am interested in the general aspects of all the fields you mention, BUT NOT FROM A TECHNICAL PERSPECTIVE. Thanks anyway for giving us an opportunity to express our thoughts on this. Vic Boersma "WE NEVER ADMITTED BEING IGNORANT IN THE FIELDS WE WORKED" For a copy of our rates please hang on to your seat.
RE: European Directives
A complete listing of European Directives is available, as well as harmonized standards applicable to each directive at: http://www2.echo.lu/nasd/ Doug Frazee EMC Compliance Engineer Alliant Techsystems, Inc. Advanced Technology Applications 401 Defense Highway Annapolis, Maryland 21401 USA Tel:(410) 266-1793 FAX:(410) 266-1853 doug_fra...@atk.com -- From: Arthur Poolton (MEPCD)[SMTP:arth...@apricot.mee.com] Sent: Friday, April 04, 1997 9:22 AM To: 'emc-p...@ieee.org' Subject:European Directives Hi, >Does anyone out there know where I would be able to obtain a >comprehensive listing of ALL European Directives in force and impending >please ? > >Arthur Poolton >Approvals Manager >Mitsubishi Electric - PC Division (Apricot Computers Limited) >
Job Opportunity
Radio Frequency Investigation Ltd (RFI) is an independent EMC, radio and telecommunications type approval laboratory in Basingstoke, Hampshire, England. RFI currently have vacancies for 1 - 2 positions in their Regulatory and Technical Support Services group. The positions would involve providing support and consultancy services for manufacturers in the fields of EMC, radio and telecommunication type approval. Typical work would involve carrying out regulatory investigations, preparing and reviewing test plans and preparing and assessing EMC technical construction files as part of RFI's commitment as a competent body under the EMC directive. In addition, the position involves presenting training courses to manufacturers. Any one interested in more details of these positions can get a more information by sending me a brief CV / resume. A more detailed job description is available on request. - James Cunningham Radio Frequency Investigation Ltd. Basingstoke, England Tel: +44 (0)1256 855429 (Direct Tel) E-mail: james_cunning...@rfi.co.uk Web Site: http://www.rfi.co.uk -
Enforcement of NRTL Mark on Telecom equipment
My understanding is that it is a requirement in the US/Canada that any equipment intended to connect to the telephone network must have an NRTL Mark. Can anyone advise where this requirement is called out (NEC??) and how it is enforced? Thx, JoeReceived: from sw.microcom.com (207.31.204.1) by smtp.microcom.com with SMTP (IMA Internet Exchange 2.1 Enterprise) id F87F; Thu, 10 Apr 97 17:22:11 -0400 Received: from sw.microcom.com (root@localhost) by sw.microcom.com (8.7.5/8.7.3) with ESMTP id RAA01777; Thu, 10 Apr 1997 17:20:46 -0400 (EDT) Received: from europe.std.com (europe.std.com [199.172.62.20]) by sw.microcom.com (8.7.5/8.7.3) with ESMTP id RAA01773; Thu, 10 Apr 1997 17:20:45 -0400 (EDT) Received: by europe.std.com (8.7.6/BZS-8-1.0) id QAA07708; Thu, 10 Apr 1997 16:12:13 -0400 (EDT) X-Authentication-Warning: europe.std.com: daemon set sender to treg-approval using -f Received: from world.std.com by europe.std.com (8.7.6/BZS-8-1.0) id QAA07693; Thu, 10 Apr 1997 16:12:08 -0400 (EDT) From: grant.pi...@adn.alcatel.com Received: from adn.alcatel.com (postman.adn.alcatel.com) by world.std.com (5.65c/Spike-2.0) id AA10152; Thu, 10 Apr 1997 16:12:06 -0400 Received: from by adn.alcatel.com with SMTP (1.40.112.8/16.2) id AA099543085; Thu, 10 Apr 1997 16:11:26 -0400 X-Openmail-Hops: 1 List-Post: emc-pstc@listserv.ieee.org Date: Thu, 10 Apr 97 16:11:01 -0400 Message-Id: Subject: What is RC1 ? Mime-Version: 1.0 To: emc-p...@majordomo.ieee.org, t...@world.std.com Content-Type: text/plain; charset=US-ASCII; name="What" Content-Transfer-Encoding: 7bit Sender: treg-appro...@world.std.com Precedence: list Reply-To: t...@world.std.com
Can someone identify this ferrite?
Tania, It sounds like a Kitagawa SFC-10. Sorry I can't help if you need a US- based supplier but they are easily available here in UK, so I doubt you will have a problem. Regards, PFORD at HVTVM GBXYR7PW at IBMMAIL Phillip Ford phil_f...@uk.xyratex.com ext 3255 tel:+44 (0)1705 443255 fax:+44 (0)1705 499315 Engineering Lab, 871/24-22X Y R A T E X *** Forwarding note from I1467402--IBMMAIL 11/04/97 06:30 *** From: tania.gr...@octel.com List-Post: emc-pstc@listserv.ieee.org Date: Thu, 10 Apr 1997 19:02:27 -0700 Subject: Can someone identify this ferrite? To: emc-p...@majordomo.ieee.org While performing emission testing, we have discovered that a certain ferrite performed better than some others, however, we cannot identify the source. It is a standard issue, almost square, clamshell type housing to be used with a cable approximately 10 mm diameter, with an outer off-white plastic case with the following markings: KG (italics) inside a rectangle, molded on one side SFC-10 sticky-on white label on the other side If anyone is familiar with this type, I would be most grateful if you could identify it. Thank you. Tania Grant, Octel Communications Corporation tania.gr...@octel.com End of mail text Additional SMTP headers from original mail item follow: Received: from ruebert.ieee.org by E-MAIL.COM (IBM VM SMTP V2R3) with TCP; Fri, 11 Apr 97 01:28:47 EDT Received: (from daemon@localhost) by ruebert.ieee.org (8.7.5/8.7.3) id WAA02000 for emc-pstc-list; Thu, 10 Apr 1997 22:08:54 -0400 (EDT) Mime-Version: 1.0 Message-Id: <00056659.3...@corp.octel.com> Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Description: cc:Mail note part Sender: owner-emc-p...@majordomo.ieee.org Precedence: bulk Reply-To: tania.gr...@octel.com X-Resent-To: Multiple Recipients X-Listname: emc-pstc X-List-Description: Product Safety Tech. Committee, EMC Society X-Info: Help requests to emc-pstc-requ...@majordomo.ieee.org X-Info: YUn?Subscribe requests to majord...@majordomo.ieee.org X-Moderator-Address: emc-pstc-appro...@majordomo.ieee.org
Deregulate or Enforce
Greetings, I talked with a colleague about the new FCC 15.32 on test of CPU boards this afternoon. We reached the following conclusion. Test Condition Margin CPU board Pass/Fail 1. cover removed less than limit pass 2. cover removed over limit not more than 3db 1) cvr inplace less than limit pass 2) cvr inplace more than limit fail 3. cover removed over limit more fail than 3db limit here means FCC Class B limit. Is this your understanding of this new rule as well? If so, I feel FCC does not deregulate in terms of selling cpu boards alone. Have not seen a cpu board only fail class b limit in air marginally. The new rule will probably make it impossible to sell current cpu boards without installing it in a chasis. Comments please, TIA. Best regards, Tom Regulatory Compliance Information Center http://www.rcic.com
Can someone identify this ferrite?
While performing emission testing, we have discovered that a certain ferrite performed better than some others, however, we cannot identify the source. It is a standard issue, almost square, clamshell type housing to be used with a cable approximately 10 mm diameter, with an outer off-white plastic case with the following markings: KG (italics) inside a rectangle, molded on one side SFC-10 sticky-on white label on the other side If anyone is familiar with this type, I would be most grateful if you could identify it. Thank you. Tania Grant, Octel Communications Corporation tania.gr...@octel.com
TREG or EMC-PSTC
As more and more colleagues joins treg or emc-pstc, I always ask myself a question. Which group should I send my question to? A general pratice we have seen here is to send it to both. Probably most of us do not care but it would be nice to know which group is more likely interested in my question anyway, or probably most of us subscribe to both groups. If you have a similar thought or don't mind putting a vote in the poll, please reply to me directly at t...@superlink.net with the following. I subscribe __ TREG __ EMC-PSTC I am interested in __ General compliance issue __ EMC/EMI __ Safety __ Telecommunication regulation __ Others I'll let you know the results. Thank you for your help. Best regards, Tom Regulatory Compliance Information Center http://www.rcic.com
