Hook it up to your KPA1500 and you've got whole house illumination!
Martin, HS0ZED
On 23/01/2019 13:11, Wayne Burdick wrote:
Up the power to 100 W and you’ve got a personal heating appliance. Awesome.
“Without RF, life itself would be impossible.”
Wayne
----
elecraft.com
On Jan 22, 2019, at 9:04 PM, David Gilbert <xda...@cis-broadband.com> wrote:
Here's another idea.
Run a wire inside your shirt from one cuff across your back and down to the other cuff.
Wrap loading coils around each arm just above the elbow. Feed the "dipole" in
the center at the back of your neck.
I did a quick model (assuming your arms are held straight out) with 5.5 feet total length
and 2200 inductive ohms for each coil, with each coil 30% from their respective ends of
the wire. It "resonates" at around 14.15 MHz, but with only about 0.4 ohms
real feedpoint impedance. I assume it would take some sort of extra matching network to
bring that up enough that a KX2 with the internal tuner could drive it.
Ignoring the effect of a person's arm, another quick calculation says that the
arm coils would need to be roughly 11 turns of 10 gauge wire 3.5 inches in
diameter ... unless I made a mistake, which is quite possible.
It would bring new meaning to the term "compromise antenna", but I bet it would
be more effective than a super small loop the size of backpack frame.
73,
Dave AB7E
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
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