Hello Markus and Paul, VLF,
Many thanks for the feedback. What a great result!
Paul, after the EbNaut transmission i sent '73' in DFCW-90, which is a
typical mode for LF operation. Do you see the message in a spectrogram,
like Markus did at DL0AO? Best setting may be something like 20 mHz and
10 sec/pixel.
On my tree (meanwhile shutdown because the old accu is empty!) the E
field is still not really usable but the loops work very well on that
frequency. Mixing both loops and optimising the settings gives carrier
S/N: 48.05 dB in 282.5 uHz for the carrier transmission!
So i could see a clear trace from a 1 W transmitter!
I'll produce a spectrogram from the postprocessed data...
Maybe Jacek got something too? :-)
73, TNX, Stefan
Am 16.03.2019 15:29, schrieb Paul Nicholson:
Stefan wrote:
> The carrier is now running since 09:31 UTC at 5170.1 Hz.
Enormous signal here -
http://abelian.org/vlf/tmp/190316a.png
S/N 33.6 dB in 278uHz, -2dB in 1Hz, -36dB in 2.5kHz.
> Message:
> *f = 5170.1 Hz
> Symbol period: 2 s
> Characters: 14
> CRC bits: 14
> Coding 16K21A
> start at 10:30:00.3 UTC.
Decoded rank 0 BER 8.9% constant reference phase.
carrier Eb/N0: 10.3 dB
carrier S/N: 29.3 dB in 264.8 uHz, -6.5 dB in 1Hz, -40.5 dB in 2.5kHz
--
Paul Nicholson
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