Thanks for the amazing response and great ideas. If someone wants to build a backpack loop antenna for 20 m sooner than I can, I promise to extensively field test it for you. If it works, it could become an Elecraft product. (AL1? :)
The KXIO2 option for the KX2 includes two open-drain outputs that could be used to slew a C-tuning motor up and down with suitable buffering. I’ll write the code for that if/when it’s needed. Wayne N6KR ---- elecraft.com > On Jan 22, 2019, at 7:43 PM, Bill Johnson <[email protected]> wrote: > > The back pack frame would be the antenna? Low power is the game. I am not > concerned. In the Vietnam era, I was in a station where we had ~5 10KW > transmitters using wave guide at ~1.9Ghz and while there were very large > dishes, the exposure was there. I would never worry about HF at 10 watts > close to my body, but there may be studies that dispute that. I am still > alive after 12 months constant exposure to agent orange. No problem. What > was I writing about? :_) > > (Emoji added in case the sarcasm was missed.) > > 73, > Bill > K9YEQ > > https://wrj-tech.com/ > > -----Original Message----- > From: [email protected] <[email protected]> On > Behalf Of Wayne Burdick > Sent: Tuesday, January 22, 2019 2:57 PM > To: Elecraft <[email protected]> > Cc: KX3 <[email protected]> > Subject: [Elecraft] Urban stealth HF: Inside-the-backpack loop antenna? > > I’ve engaged in plenty of ultralight HF pack operation, with a KX2, AX1 > antenna and a dragged counterpoise. In wide open spaces it’s a blast. But > urban settings with dogs, wire-eating cacti and overzealous Neighborhood > Watchers can distract from one’s radio experience. > > 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 > N6KR > > > > ---- > elecraft.com > ______________________________________________________________ > 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] ______________________________________________________________ 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]
