Hi Martin,
Am 09.06.2011 13:00, schrieb Martin Evans.:
Hi Stephan.
Well, the plan is to get my aerial working properly on receive first,
then use it to transmit as well. I am only interested in LF - 137kHz
and 160m, no higher.
Sounds good! ;-)
I think mostly the TX antenna is rather noisy compared to a separate RX
antenna, at least if you are not outside in the landscape.
It would be most convenient if I could just use the one aerial for
both because I have the usual problems with the Estates Manager (the
XYL!!).
Oh, i know about that problem ;-) Maybe you can build a single turn loop
(out of copper tube) and cover it with some flowers like roses? This
should not affect the resonance too much ;-) Or build a loop disguised
as an archway, like
http://ecx.images-amazon.com/images/I/51YGxLs6YZL.jpg :-)
I do intend to get an E probe working as well - it could go on the
pole on the house, on a smaller pole on top, and be maybe 15 meters
above ground, but this comes later.
OK. But maybe the "earth" of this pole is "contaminated" with QRN.
You'll see!
Good luck and fun. The season comes! :-)
73, Stefan
Martin GW3UCJ.
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I assume you're talking about RX antennas?
If you want to use a loop, maybe you want to build an own loop for
137 kHz that is placed as far as possible from the house. The size
(enclosed area) may be smaller. You may use a coax cable going to the
shack (maybe RG174) that is grounded in the garden, with an own LF
earth rod. Then you can use a transformer to couple the signal to
your RX.
There are several ways to do it and the best SNR that can be achieved
depends on the local noise situation.
I am rather a fan of small E probe antennas since they are easy to
build and can easily be lifted to 10 m above GND, e.g. with a small
plastic rod. But my experience with loops is small, maybe i become a
fan of them too soon :-)
73, Stefan/DK7FC
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