My EFHW [granted, it is technically only one half-wave on 80 m] got a
pretty good write up in QST not long ago, after I had it installed, and
he elevated the far end into a tree. While his review was pretty
qualitative [:-(] which has become more common in QST these days, he
still got the same impedance sweep 3-30 MHz as I do. So, I'm not sure
the electrical characteristics are all that dependent on dielectric loss
in my fence. The fence is very dry wood, our relative humidity runs in
single digits most of the time, it was 6% last evening.
At any rate, it looks like I'm going to sell my KPA500/KAT500, just have
to get up the nerve to part with them. The antenna is rated at 500W
ICAS [whatever that means quantitatively these days], but I'm loathe to
nuke Toady, the neighbor's Lab whose run is directly on the other side
of the fence. I do occasionally turn on a couple of lamps in the
bedroom on capacitative switches on 80 with 100W, that's enough.
My only connection with MyAntennas was to write them a $140 check, but I
really am surprised how well it performs in a highly non-optimal
configuration. All this "matching bafflegab" was unheard of when I was
a young ham. You fed your dipole with 75 ohm twin-lead, coupled it to
the PA with a 2 or 3 turn link coil, and as the reactance of the link
changed the resonance, you compensated by "re-dipping the plate."
Of course, when I was a young ham, dirt was pretty young too. :-)
73,
Fred K6DGW
- Northern California Contest Club
- CU in the Cal QSO Party 1-2 Oct 2016
- www.cqp.org
On 8/4/2016 4:48 PM, Lynn W. Taylor, WB6UUT wrote:
What happens if the antenna is well above ground, away from any fences?
On 8/4/2016 3:55 PM, Guy Olinger K2AV wrote:
If we are just dodging the HOA, vs creating a remote site, or not
operating
at all, what you describe seems quite reasonable. One half wave on 80,
two
on 40, three on 30m, four on 20m, etc. allow a rather simple feed
mechanism, and any sloppiness will be mitigated to some degree in the
unavoidable dielectric loss of the fence and ground.
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