There may be other options. A serpentine pattern fed at the center
could give you enough length for a 10 m or larger dipole. I've seen
serpentine F antennas on printed circuit boards. I've also seen spiral
patterns used so I know they work to some extent.
If a dipole cut for 14 MHz is ~ 400 inches long it would take 11 up and
down segments of 36" each to stuff it inside your pack. I'm sure the
serpentine factor will change the length needed but with a bit of
tweaking this could work.
Or feed it at one end for a 40 meter monopole (a counterpoise could be
woven into the pack).
73 & GL,
Kevin. KD5ONS
-
On 1/22/19 12:57 PM, Wayne Burdick wrote:
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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