...the carrier was unintentionally run on 5170.1 Hz since 4 UTC. It was
changed to 5170.005 Hz at 8:26 UTC.
The transmission at night was very stable. Next, the same transmission
at night and the carrier afterwards, jumping to 5170.005 Hz at 4 UTC...
73, Stefan
Am 20.10.2017 16:11, schrieb DK7FC:
Sorry, that was false:
New:
f = 5170.1000 Hz
Start time: 20.October.2017 16:00:00 UTC (daily)
Symbol period: 180 s
Characters: 1
CRC bits: 6
Coding 8K19A
Duration: 12h
Antenna current: 300 mA
Tomorrow there will be a carrier transmission between 4 UTC and 16 UTC.
73, Stefan
Am 20.10.2017 15:50, schrieb DK7FC:
...there have been some thunderstorms again last night in a range of
< 2000 km. Arround 3 UTC the cancellation effects were quite
expressed. Within 200 Hz or so, the SNR can change by 10 dB. It looks
like the dSNR/df is most expressed in the range arround 5 kHz.
A working propagation model would be useful for us. So far we can just
try to experiment with multi frequency carriers to get an impression.
Let's try a short message at night. Maybe it is a bit to optimistic to
expect that it will be decoded by Alex. But why not. We learned that
the impossible is possible. I'm not sure about the stability of the
antenna current during rain, we will see...
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