The problem I see is Uncontrolled contents of backpack detuning the loop. Sent from my iPad
> On Jan 22, 2019, at 10:56 PM, Wayne Burdick n...@elecraft.com [KX3] > <kx3-nore...@yahoogroups.com> wrote: > > 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 <k9...@live.com> 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: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On >> Behalf Of Wayne Burdick >> Sent: Tuesday, January 22, 2019 2:57 PM >> To: Elecraft <elecraft@mailman.qth.net> >> Cc: KX3 <k...@yahoogroups.com> >> 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:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html Message >> delivered to k9...@live.com > > __._,_.___ > Posted by: Wayne Burdick <n...@elecraft.com> > Reply via web post • Reply to sender • Reply to group • > Start a New Topic • Messages in this topic (1) > > Have you tried the highest rated email app? > With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email app > on the market. What are you waiting for? Now you can access all your inboxes > (Gmail, Outlook, AOL and more) in one place. Never delete an email again with > 1000GB of free cloud storage. > VISIT YOUR GROUP > • Privacy • Unsubscribe • Terms of Use > > SPONSORED LINKS > > > > . > > > __,_._,___ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
