Hi Paul, VLF,
Time to continue and complete that experiment: The goal is 20
characters on 6.47 kHz.
I just re-built the system, the TX runs 260 mA on 6470 Hz.
Now, the nexct attempt:
f = 6470.00000 Hz
Start time: 05.10.2016 21:00:02 UTC
Symbol length: 140 s
Characters: 15
CRC 16
Coding 8K19A
Duration: 38h, 34m, 40s
Antenna current: 250 mA (ish)
73, Stefan
The last and best result so far:
Am
21.05.2016 04:15, schrieb Paul Nicholson:
Stefan
wrote:
> f = 6470.00000 Hz
> Start time: 20.05.2016 00:30:02 UTC
> Symbol length: 100 s
> Characters: 10
> CRC 16
> Coding 8K19A
Copied 'THAT WORKS'
Eb/N0 = +2.7 dB, constant reference phase
Carrier: 19.25 dB in 13.3 uHz
Error map: http://abelian.org/vlf/tmp/160520a.gif
--
Paul Nicholson
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