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From: Jan Panteltje <alien@comet.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Dutch-like language [OT]
Date: Thu, 05 Dec 2024 13:54:48 GMT
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On a sunny day (Thu, 5 Dec 2024 12:50:33 +0000) it happened
liz@poppyrecords.invalid.invalid (Liz Tuddenham) wrote in
<1r43bxx.8z68ij1kp3c1yN%liz@poppyrecords.invalid.invalid>:

>Jan Panteltje <alien@comet.invalid> wrote:
>
>
>> I should make a good wire antenna, have an antenna tuner,
>> but so many other projects.
>
>From the photograph you linked to, showing your garden, it looks as
>though you are hemmed-in on all sides by houses.  A long wire might
>work, but it also could act as a conduit for noise picked up from your
>neighbour at the distant end.  You need to keep it as high as you can
>without attracting the attention of the local authorities.
>
>Long lightweight alloy poles are sold for television aerials and one of
>those can be fixed to the shed or a fence post without needing guy
>ropes. as long as the wire isn't too tight.  You can buy the plastic
>equivalent of 'egg' insulators or just use a length of monofilament
>nylon fishing line.  With an ATU, the length isn't so critical.

This recoding shows my 27 MHz GPA mouned on the side house
rising above the Christmas tree I planted in 1998? or so.. old address.
Recoding was ctually a test for my Canon camera..
I still have that antenna, not mounted here ...




>The biggest problem is usually the lead-in.  I managed to bring mine
>into the loft in the gap between two tiles and then used co-ax to
>connect it to the receiver.  There is a mis-match at the aerial end, but
>the downlead matches the receiver input impedance, so the downlead
>doesn't form part of the aerial and doesn't pick up interference inside
>the house.
>
>
>> There is a project on the web that subtracts local RF noise from the
>antenna signal
>
>There were plans published for some of these in The Netherlands during
>WWII under the name "Moffenzeef".

Found it (in Dutch):
 https://nl.wikipedia.org/wiki/Moffenzeef

Any length of wire you can tune in with an antenna tuner I think.
 https://panteltje.nl/pub/ebay_QRP_antenna_tuner_IXIMG_0552.JPG

SWR meter I build long ago:
 https://panteltje.nl/panteltje/pic/swr_pic/
also shows my RCI-2970 shortwave transceiver 120 W PEP