how about code to run a screwdriver ????antenna that is.
I use my k2 /kxpa100 in my VW screwdriver up on the roof rack,.....
woeks great but could be elecraftmatic !!!!
On 1/22/2019 10:56 PM, Wayne Burdick 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
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