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John,
regarding your receive wire: "In the woods" seems
to suggest that it may be receiving mostly the magnetic field component, acting
as an earth loop. What is the orientation of the wire (eg SW to NE?), and
do you experience some directivity?
Best 73,
Markus (DF6NM)
Sent: Sunday, August 12, 2012 3:18 PM
Subject: Re: LF: Op32 tonight on 137kHz
Stephan,
-35 @ 0213
-36 @ 0245
Yes, just an unterminated wire. There is a ground stake at the near end,
and I use a hi-z input preamp to drive a Cat5 cable back to the shack. This is
all well out in the woods to avoid a rather noisy power line near the
house.
It works very well at MF and LF. An elevated wire picks up more signal, but
does not improve the SNR. It also causes intermodulation products with NAA on 24
kHz.
John,
Do you have the s/n levels ?
150 mtr wire on the ground ..... actually on
the ground , far end open cct ?
Tnx -G.
Sent: Sunday, August 12, 2012 1:12 PM
Subject: Re: LF: Op32 tonight on 137kHz
Stephan,
It was quite noisy here last night, with storms along the eastern
U.S. In addition to the W1TAG and W1VD decodes at 0213Z, we both had decodes
on the next cycle at 0245, and Jay had one at 0318Z. His K9AY antenna has some
advantage by rejecting noise from the west. My rx antenna here in Maine is
just a 150 meter wire on the ground.
John W1TAG/1 FN43sv
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