Hello Jim,
Ok, thanks for the info. Yes, have seen that 137.7 is on a DCF sideband,
unfortunately...
And my backgound noise here in the city is quite disappointing. Have to
work on the /p station, i.e. the UHF handheld TRX. The automatic
variometer is another important step. And i shall add some kind of
second PTT from the RS232, to enable the UHF link keying from remote.
Then i can set the QRG (from 136.172) to 136.5 and the variometer
automatically turns to resonance. Then enabling the UHF link and so i do
not need to drive to the institute to enable the system for /p use. All
could be done from home then and i can start with the bike to a quiet
location.
This will be done soon, so that there can be plenty of CW contacts for
me in the quiet season which starts now...
Thanks for calling/trying!
Cu soon.
73, Stefan/DK7FC
Am 10.09.2011 12:03, schrieb James Moritz:
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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