You can just use heliax. Works perfect.
Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ Owner - Operator Big Signal Ranch Staunton, Illinois email: [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Vic K2VCO Sent: Monday, May 20, 2013 9:07 PM To: [email protected] Subject: Re: [Elecraft] magnetic loop antennas I googled 'flexible conduit' and what I see looks like BX cable -- made out of a single flat piece of metal wrapped in a spiral shape. If this is what you are talking about, it would be AWFUL for this purpose -- it would have a very high RF resistance and so be very inefficient. There are very high currents in the loop and you have to keep the resistance at RF as low as possible -- that's why large-diameter copper tubing is good. Do you have a link to a picture of the stuff you are looking at? On 5/20/2013 6:43 PM, Bill Blomgren wrote: > I saw the great writeup on the magnetic loop antenna and the inventive High Voltage > capacitor for tuning the thing. I'm looking at one of them strictly because I'm stuck in > an apartment. > > The fact it should be good for 100 watts is perfect for what I'm looking at buying. > > I'm just wondering about the copper pipe used for the outer loop... I spotted some very > reasonably priced flexible conduit that could be used for the "loop" proper. Do what is > necessary to bond the capacitor into the rig, and it would appear to be a reasonable > alternative to the rather pricy copper pipe. (They want your first born here for that, > and the thieves are busy collecting anything that isn't nailed down. > > Thoughts on that for its larger diameter, which should help with the coupling to the > rest of the world... -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
