| Re: through glass coax coupling |
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Group: rec.radio.amateur.antenna · Group Profile
Author: Haines BrownHaines Brown Date: Apr 3, 2008 05:12
"Mike Kaliski" tesco.net> writes:
> "Haines Brown" teufel.hartford-hwp.com> wrote in message
> news:87ve30i4rf.fsf@teufel.hartford-hwp.com...
> Automotive couplers for two metres manage with a 2 inch by 2 inch
> plate either side of the glass. It could be worth trying 6 inch by 6
> inch plates on the domestic window and see what signal level gets
> out. Reception shouldn't be a problem if you can get 50%% or more of
> your transmission power out through the glass.
The suggestions for a panel to insert into a partially opened window and
to close the window on twin lead seem out. It's a steel casement type
window that must be fully shut, and even if twin-lead were to get around
the edge, it would be sandwiched in steel. I don't own the wall, so even
if a hole could be put in it (which it can't), I don't own it.
On the positive side, this is a single pain of ordinary class, and I
could make a capacitative coupler over 12" square and still get too near
the steel frame. It's a curtained window, and so appearance is not
important.
A question. Is this coupling purely capacitative at this frequency (the
more surface area the better), or is it somewhat tuned (try different
sizes to see what signal level gets out).
An obvious question, how can the coax be connected to the sheets of
metal? That is, what happens to the braid? Or could there be two sheets
next to each other on both sides of the glass, say one foot square each,
with one for the coax center conductor and one for its braid?
> The only advantage that a commercial coupler might have is that the
> visual asthetics might be a bit better than a home brewed effort.
I was hoping to see a commercial coupler to figure out how they are
constructed, but so far have seen only one for XP radio, and it is not
clear what's up with it.
--
Haines Brown, KB1GRM
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