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]>
