Thanks all for the inputs on this subject. Regards richard
From: [email protected] [mailto:[email protected]] On Behalf Of Ken Javor Sent: Tuesday, May 05, 2009 1:06 PM To: Untitled Subject: Re: AM antennas As usual, Mr. Woodgate is precisely correct. That is a technique used by many listeners who are content to place the antenna near their receiver. However, if your receiver has an antenna input separate from the ferrite wound loop, the current probe coupling technique is more efficient. Also, if you want your loop mounted remote from your radio, as in the attic, or in a metal building where the antenna needs to be near a window, then again the current probe technique makes the remote positioning possible and efficient. Ken Javor Phone: (256) 650-5261 > From: John Woodgate <[email protected]> > Date: Tue, 5 May 2009 17:53:50 +0100 > To: <[email protected]> > Subject: Re: AM antennas > > In message <c625ab7f.41090%[email protected]>, dated Tue, 5 > May 2009, Ken Javor <[email protected]> writes: > >> 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. > > If you make one of these and just stand it next to your basic AM > receiver which has a ferrite rod antenna[1], it acts as quite a good > 'amplifier' (really a field concentrator) with no power supply. The loop > and rod need to be coaxal, not necessarily coaxial. (;-) > > [1] Where did the American English term 'vari-loopstick' come from? > -- > OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk > Things can always get better. But that's not the only option. > John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK > > - > ---------------------------------------------------------------- > 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. 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. 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]>
