In fact, impedance transformer was by-passed also. Now it is fixed. I have driver stage to the variometer through the transformer. Neon lamp lights up more ! Please check next transmission Thank you.
Bingo! Were getting closer to the threshold... no detectable peak in the squared rawsyms spectrum but an instant decode. Very nice! I'm off to bed now but data will be saved during the rest of the ni
Hi Edgar, yes, sure. On the RX side, you could use one of your IDC's with a Rubidium-derived LO (eg 125 kHz), and preferably 1pps lock for the SpecLab samplerate.. On the TX side, a stable and known
Thanks, I was wondering about those. The tx is 155km from here. Those sidebands might turn out to be useful markers. Decoded easily: Eb/N0=7.5 ber=0.19 decode time 22 seconds Quite a strong signal, t
Hi Domenico, for the successful 23 UT decode, error count and symbol EbN0 could be improved by slightly tweaking the time and frequency offsets. Unfortunately, none of the subsequent transmissions (0
Having decoded the 20:00 UT 22 character message, I re-encoded it and used the symbols to phase modulate the received signal. The result is an unmodulated carrier which I can take measurements from.
Today I ended my brief foray into 137 kHz. The battery was going flat on the rx so I took it down. Reception at LF seems quite easy compared to VLF: much lower noise levels and much less interference