Hi Joe, the attached plot shows the frequency stability of your opds trace received last night http://df6nm.bplaced.net/LF/opds32_151110_0736.png . Each data point is the interpolated peak of a singl
Joe, more of the same from last night, this time with frequency and level plots. Again we see some frequency variation of similar size as yesterday. It is not clear how much of that is due to propaga
Hi Markus (and thank-you to Chris, Urlich, Iban and Graham for reports/relays) Your critiques of my signals are very thorough and masterful. I am most grateful. There is a concensus amongst you, Dome
Hi Joe plaese be sending the cats bank account numbre and sort cod e so we may pay his inheritance :-)) Alan G3NYK Hi Markus (and thank-you to Chris, Urlich, Iban and Graham for reports/relays) Your
73 Alan! Joe Hi Joe plaese be sending the cats bank account numbre and sort cod e so we may pay his inheritance :-)) Alan G3NYK Hi Markus (and thank-you to Chris, Urlich, Iban and Graham for reports
Hi Joe, an interesting change happened last night: as far as I can see, your frequency has shifted to nominal 137477.000 at 22:45 UT, and appeared to be rather stable thereafter. Regarding EbNaut tra
Thanks, that's a bug - it shouldn't need -S or -r when sending or receiving unmodulated symbols as text. Fixed now in version 0.2 http://abelian.org/ebnaut/ebnaut.c Now you can do, for example echo '
Hi Markus, Convinced that the oscillator had drifted since calibration 2 years ago, I tweaked the DOXCO up 0.05 Hz and was happy to see the result on your OPDS page. Thanks for the tips on getting st
Hi Paul, Problem solved! I really messed up the encoded file but ebnaut still gave the callsign and cat's name. Amazing, isn't it! I'll be on 477.7 for the next 2 days and will get back to work on th
Joe, well maybe the "crystal drift" is not the whole story... I measured both your Op-32 and QRSS transmissions (nominally on 137477 and 137777 Hz respectively), before and after the OCXO tweak. Oper
Even though I vaguely understand how it works I always find it fascinating to see. By flipping bits in test.txt you are adding binary noise, and the input of 0's and 1's to the decoder effectively fo
Hi Markus, You've found my problem I think. The 32 bit frequency word was correct for 137.777 but one bit low for 137.477 kHz. Today the DOXCO was restored to its original calibration and the bit err