The problem is loop diameter. Efficiency on 20m of a 12” diameter loop would be on the order of 5%. Forget it entirely on 40m .. essentially a dummy load that would take around 1200 pf to resonate. On 17m efficiency would go up to around 11%.
I use a loop portable all the time (Alexloop, W4OP) and they work well. They’re both about 3 ft in diameter. The Alexloop is light enough to be carried around hand held ... the W4OP needs a table top or tripod. Grant NQ5T Sent from my iPhone > On Jan 22, 2019, at 3:57 PM, Wayne Burdick <[email protected]> wrote: > > > > So, just for grins, I’d like to try something completely incognerdo: no > visible antenna. A small remotely tuned loop (say 12” diameter) would seem to > be the best choice, as it would fit entirely inside a small backpack. It > could have modest efficiency while not requiring a counterpoise wire. Rigid > 1” copper pipe formed in a square would be convenient to deploy. > > The loop would be only 6 to 8” from soft tissue, so you’d want to run QRP, of > course. OTOH, we’re talking about HF. A cellphone by your ear is probably > worse. > > Any other antenna suggestions? > > Wayne > ______________________________________________________________ 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 Message delivered to [email protected]
