"Haines Brown" wrote in message
...
Wimpie writes:

Why not using inductive coupling? You can get reasonable coupling as
wires are just mm away from eachother, so you don't need high Q factor
circuit.

Didn't occur to me. Are you suggesting a couple coils sharing an axis,
one just inside the window and the other outside? Would the two coils
simply be designed for a 50-ohm impedance at, say, 10 meters?

I can imagine wrapping a 50-ohm coil on pvc, and inserting it into a
larger diameter pvc that is capped and which has a coax connector passing
through it. and the whole attached to the glass with silicone
adhesive. One on either side of the glass.

Matching indoor only is possible (so you don't need matching outside
to interface to 50 Ohm coaxial cable).

Not sure of your point. It seems I need to match outside.

Another problem just occurred to me. I'll use a MFJ magnetic loop, and
its tuner, if I recall, depends on an uninterrupted electical connection
through the coax. If so, I'm stuck.
--

Haines Brown, KB1GRM

Haines,

Just read the other postings about inductive coupling and I think that would
be the best way to go with a standard wire antenna like a half wave dipole,
vertical, etc.

I can't see any way of getting a magnetic loop antenna to work because you
need a direct DC path for power and tuning commands from the tuning unit to
the loop.

Might be better to put your ingenuity to better use by finding somewhere
hidden to run a thin bit of coax through the wall. Behind a switch plate,
power socket, joint fillet, alongside a pipe. There must be somewhere to put
a 1/4 inch hole that can be concealed later? For QRP work, you might get
away with a short through wall length of really thin coax, the 1/8 inch
stuff used to connect signal assemblies inside equipment.

If you are really brave, a masonry drill at high speed will cut through
glass with a bit of soapy water acting as a lubricant. Take your time and
try and brace the other side with a wooden block or elses a big bullseye
chip will be thrown out when the drill breaks through. Fill the hole with
transparent quick set epoxy when it is no longer needed.

Mike G0ULI