Close, but those loops were not tuned, to my knowledge. Ken Javor Phone: (256) 650-5261
________________________________ From: Ralph McDiarmid <[email protected]> List-Post: [email protected] List-Post: [email protected] List-Post: [email protected] Date: Tue, 5 May 2009 09:06:20 -0700 To: Untitled <[email protected]> Conversation: AM antennas Subject: RE: AM antennas Isn’t that preciously what was used in the 1930’s console (floor) radios? “A decent-sized multi-turn loop (say a foot to a meter in diameter) that is tuned to resonance at the frequency of interest (using an air variable cap or remotely controlled varactor tuning) can be quite efficient, as well as providing a high degree of front-end filtering for your receiver – very useful if trying to receive a weak remote station in the presence of a nearby stronger signal.” Ralph McDiarmid, AScT Compliance Engineering Group Xantrex Technology Inc From: [email protected] [mailto:[email protected]] On Behalf Of Ken Javor Sent: Tuesday, May 05, 2009 6:38 AM To: Untitled Subject: Re: AM antennas I believe the preference is a matter of personal needs – there is no absolute “best choice.” A vertical wire cut to a quarter wavelength over a ground plane at least a quarter wavelength in radius will give the best sensitivity, but unless you have lots of money and room, and one favorite station to listen to, that is not a practical solution. A shorter wire with a tuner can offset some of the losses associated with an electrically short wire, but most tuners are built for the shortwave, not medium wave bands. An untuned loop will have relatively poor sensitivity, which is why built-in AM loops are wound on a ferrite rod core. Also they are very small and fit within the radio enclosure. But they are hardly efficient. A decent-sized multi-turn loop (say a foot to a meter in diameter) that is tuned to resonance at the frequency of interest (using an air variable cap or remotely controlled varactor tuning) can be quite efficient, as well as providing a high degree of front-end filtering for your receiver – very useful if trying to receive a weak remote station in the presence of a nearby stronger signal. These loops need a coupler to drive the receiver; in my experience, the best coupler is an EMI test current probe; it is much more efficient than the coupling loops traditionally used for this purpose. Ken Javor Phone: (256) 650-5261 ________________________________ From: Richard Stone <[email protected]> List-Post: [email protected] List-Post: [email protected] List-Post: [email protected] Date: Tue, 5 May 2009 09:24:01 -0400 To: "Pettit, Ghery" <[email protected]>, Kim Boll Jensen <[email protected]>, EMC PSTC <[email protected]> Conversation: AM antennas Subject: AM antennas Hello group Is there a preferred AM antenna (Loop or Vertical Type) to connect locally to receiver for best reception thru out New England area incl. NY. Thanks Richard, From: [email protected] [mailto:[email protected]] On Behalf Of Pettit, Ghery Sent: Friday, May 01, 2009 11:01 AM To: Kim Boll Jensen; EMC PSTC Subject: RE: EN 55022 A1 and CISPR 22 Kim, This is not correct. We purchased EN 55022:2006 through BSI and got the same as you did. When it was pointed out to them they quickly withdrew the standard and re-issued it without the limits above 1 GHz. It should be pointed out that Amendment 2 to CISPR 22:2005 adopted the European common modifications that are contained in EN 55022:2006, so if you take CISPR 22 Edition 5 and add Amendment 2 you basically have EN 55022:2006. Ghery S. Pettit, NCE From: [email protected] [mailto:[email protected]] On Behalf Of Kim Boll Jensen Sent: Friday, May 01, 2009 4:58 AM To: EMC PSTC Subject: EN 55022 A1 and CISPR 22 Hi all I think we got into a special problem. When we bought EN 55022 (before A1 was harmonized) we got CISPR 22 ed. 5.2 as the main standard attached. This version contains A1 and A2 of CISPR 22. The problem is that the EN 55022: 2006 is based on CISPR 22 ed. 5.0 without A1 and A2 and therefore without requirements for emission over 1 GHz. The Danish Standard from where we bought the standard have informed us that it is CENELEC that have decided to include the ed. 5.2 and not ed. 5.0 and therefore this must be a EU problem since all EN 55022: 2006 then should contain the ed. 5.2. Is this correct? And if it is correct how can we know, if we got the right standards and not future requirements ? We have over the last year claimed to costumers that there was requirements for emission over 1 GHz from 1/10 2009 and now we can see that this requirements is first from 1/10 2010 (dow of EN 55022 A1). I see this as a very big problem since A1 could have been stopped or just not implemented and we would then have been testing for wrong requirements. Do you know if there are other standards which contains wrong versions of basic standards ? And lastly; what is the wording of CISPR 22 A2, because we will also need to remove this text from our ed. 5.2. Best regards, Mr. Kim Boll Jensen Bolls Rådgivning Ved Gadekæret 11F DK-3660 Stenløse Phone: +45 48 18 35 66 [email protected] www.bolls.dk - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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