Hello Paul, |
Thanks, that's great, just 3 days of about 8 hours each, for a 20
character message. But what was the message? I need to know it so i can
see it as a valid detection.
The daily transmissions are a good choice and i have my LF and MF
receivers available for receptions in the evening and night and early
Tomorrow and during the weekend i have no time to play on the roof so
let's use these days for a longer transmission.
Since we are already doing crazy things which are not possible (most HF
or even GHz guys would think like that), let's keep it that way and try
f = 5170.000000 Hz
Start time: 13.Jan.2017 08:00:00 UTC (daily repetition)
Symbol period: 6 s
Characters: 100 (!)
CRC bits: 8
Duration: 8h, 20m, 48s
Antenna current: ~ 225 mA
After the 75 character message you said that 0 CRC bits would have been
a better choice. So i'm reducing the CRC bits here to 8, i can't go
lower with the current EbNaut-tx version.
Am 12.01.2017 19:47, schrieb Paul Nicholson:
> f = 5170.000000 Hz
> Start time: 10.Jan.2017 08:00:00 UTC
> Symbol period: 24 s
> Characters: 20
> CRC bits: 16
> Coding 8K19A
Decoded after stacking three of the daily transmissions.
Eb/N0 = -0.7dB BER 34.7% at rank 71540 with constant
S/N (three days combined) 20.00 dB in 33.8 uHz.
10th -5.8 dB phase 24.5 -63.9dB in 2500Hz
11th -5.3 dB phase 22.8 -63.5dB in 2500Hz
12th -4.9 dB phase 16.8 -63.0dB in 2500Hz