...looks like there was no decode from DL0AO from that transmission. It
was one of the noisiest days again. I already expected that result and
repeated the same message again, running today (24 hours, ending 0
UTC). With Markus' tool to stack the resulting files, they could gain 3
dB by stacking these two transmissions.
Today the noise is much lower. Attached is a RDF spectrogram showing
the BPSK as recveived on the tree.
I'm announcing another test, again trying 3 characters, even in a
shorter time, avoiding the night time where the SNR is much lower:
f = 3675.005000 Hz
Start time: 12.August.2017 04:00:00 UTC
Symbol period: 80 s
Characters: 3
CRC bits: 7
Coding 16K21A
Duration: 16h
Antenna current: 160 mA
73, Stefan
Am 09.08.2017 16:48, schrieb DK7FC:
Hi VLF,
An attempt for a first message transfer between radio amateurs in the
range 3...4 kHz for an expected distance of 226 km, or 2.77 wavelengths:
f = 3675.005000 Hz
Start time: 10.August.2017 00:00:00 UTC
Symbol period: 120 s
Characters: 3
CRC bits: 7
Coding 16K21A
Duration: 24h
Antenna current: 160 mA
73, Stefan
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