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Dear Jim, LF,
yes, life here (especially in DL) would also be
much easier if we decided to gather around the DCF39 nulls. There are
minima near 137.53, 137.57, 137.73, 137.77 (ie a few Hz below the
TA waterhole). My current workaround is setting the noise blanker
threshold to trigger on every FSK transition, but the disadvantage is
that this creates ugly 0.1 Hz spaced sidebands around strong
signals.
Best 73,
Markus (DF6NM)
Sent: Saturday, September 10, 2011 12:03 PM
Subject: LF: Re: M0BMU / DD7PC / DK7FC
Dear Stefan, Marco, LF Group,
Yes... I started
calling CQ on 137650Hz and then saw DD7PC ("M" copy) and
replied, but
perhaps Marco uses a narrower spectrogram window than I do...
The reason for
this frequency was that there is a null in the amplitude of
DCF39's
sidebands at about 137.64kHz, so received SNR is considerably better
at this
slightly lower frequency - Marco would have been "O" copy if he was
using
the lower frequency.
I also heard DK7FC RST 559 working DD7PC (not
audible) on 136.5kHz. I tried
calling in CW also, but apparently the noise
level is too high.
Cheers, Jim Moritz
73 de M0BMU
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