How about a Vinyl window with a multi-turn loop around the outside frame, fed
with a smaller loop installed in the lower sill? Cap tuned with the cap
external to the frame so it could be changed for different bands.
Plus Points = completely hidden
Minus Points = very directional - non rotateable (though you could have one on
each wall of the house giving some choices)
Clint - W5CPT
----- Original Message -----
From: kd4e
To: TowerTalk@contesting.com
Sent: Monday, November 13, 2006 10:48 PM
Subject: [TowerTalk] Designing A Window Frame Antenna?
If you were to choose, or design, a metal window frame
for a fixed window to double as a useful antenna how
would you do it? Perhaps a 4' x 6' frame.
No expectations of spectacular performance, just a
little redundancy should outside antennas be damaged
during a storm. Otherwise tied to a scanner or SW
receiver. We will have a few acres in a non-deed
restricted community, but it would be fun to make
contacts from an "optimized window frame antenna".
Perhaps merely an exercise in theory ... perhaps
something useful in a deed-restricted community.
We live in an all-steel home which keeps RF noise
and desired signals out and traps RF noise and
desired transmissions (e.g. cellphone and HT) inside.
The only RF-porous areas are near doors and windows.
Our next home will be a monolithic.com dome home,
mostly concrete shell with a grounded rebar shell.
A less RF-tight container, but still unfriendly.
If one were to seek out, or design, a window frame
compatible with an HF antenna tuner how might one
best proceed?
My first thought is to use a metal window frame
isolated from the rebar cage. To increase the
electrical length a metal ribbon could be glued
to the glass.
Has lack of sleep and insufficient coffee addled
me brain?
--
Thanks! & 73,
doc, KD4E
... somewhere in FL
URL: bibleseven (dot) com
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