> I need to feed my coax (QRP, 10 meters) out through a pane of glass, and
> for that I need a through-glass coax coupler (this is not an automotive,
> but a home window situation).

> I'm sure a FAQ, but a search on line did not resolve my question.
>
> I need to feed my coax (QRP, 10 meters) out through a pane of glass, and
> for that I need a through-glass coax coupler (this is not an automotive,
> but a home window situation).
>
> Most couplers are apparently capacitative. At 10 meters, for example,
> would I gain much by going to a microstrip coupler instead (whatever
> that is)?
>
> How good a coupling can I expect with a through-glass coupler? It sounds
> very lossy, but perhaps not.
>
> What brands of couplers would you recommend, or what is a good source
> for such couplers?
>
> --
> ...

>
> "Haines Brown" teufel.hartford-hwp.com> wrote in message
> news:87ve30i4rf.fsf@teufel.hartford-hwp.com...

>> I'm sure a FAQ, but a search on line did not resolve my question.
>>
>> I need to feed my coax (QRP, 10 meters) out through a pane of glass, and
>> for that I need a through-glass coax coupler (this is not an automotive,
>> but a home window situation).
>>
>> Most couplers are apparently capacitative. At 10 meters, for example,
>> would I gain much by going to a microstrip coupler instead (whatever
>> that is)?
>>
>> How good a coupling can I expect with a through-glass coupler? It sounds
>> very lossy, but perhaps not.
>>
>> What brands of couplers would you recommend, or what is a good source
>> for such couplers? ...

> "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 effective 2M antennas (Antenna Specialists) accomplish the
> lossless fed through because the radiator is voltage fed half wave and
> the interior coupling unit has a hi-->low Z transformer. You could do
> the same at 10M by converting the 50 Ohm feed to a higher impedance
> and then down converting outside. The downside is that this will
> likely limit your bandwidth a bit.

> I'm sure a FAQ, but a search on line did not resolve my question.
>
> I need to feed my coax (QRP, 10 meters) out through a pane of glass, and
> for that I need a through-glass coax coupler (this is not an automotive,
> but a home window situation).
>
> Most couplers are apparently capacitative. At 10 meters, for example,
> would I gain much by going to a microstrip coupler instead (whatever
> that is)?
>
> How good a coupling can I expect with a through-glass coupler? It sounds
> very lossy, but perhaps not.
>
> What brands of couplers would you recommend, or what is a good source
> for such couplers?
>
> --
>
> Haines Brown, KB1GRM ...

> 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.

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

> 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.
> ...

> "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 ...