Hello Joe, i'm currently running a Spectrum Lab session centered on 477700.00 Hz. Soundcard samplerate is calibrated using GPS 1_pps and the receiver (JRC NRD-92M) is referenced by an home-made 10 MH
Domenico, You may be able to copy a weak EbNaut transmission: Frequency: 477.695 kHz coding: 8K19A message: 12 chars symbol period: 1 second start time: 18:00 repeat: XX:30 and XX:00 until 20:45 mess
Hi Domenico, group, The RL is on the ground but the tower is still there (touch wood). 477.7 8K19A 12 Chars 1 s elements starting 2130 and every half hour till dawn, fried fet, or mother nature's wra
Five out of six transmissions were copied in Nuernberg: start carr. sym. UT dB dB 18:00 (garbage) 18:30 6.7 3.5 19:00 10.3 8.2 19:30 7.1 4.2 20:00 8.3 4.8 20:30 5.3 2.6 The 19:00 transmission happene
Thanks very much Markus. I'm surprised the signal is so strong and I would guess that Domenico has a good chance to decode. Eb/N0 from symbol errors is consistently about 3dB below the carrier S/N fo
Nice going Paul... start carr. sym. UT dB dB 22:30 (garbage) 23:00 7.1 6.1 23:30 9.3 8.4 ... The reconstructed carrier vs. symbol error dB difference may perhaps be attributable to the phase variatio
No problem, that would only make a small difference to the error rate. Plenty of spare dBs on the decodes so not really much of a test of EbNaut but I'm happy to see EbSynth holding steady with the 9
Hi Paul and Joe, thanks for the signals. Got more successful decodes from Paul during the rest of the night (see table beneath). Pieces of carrier were also visible on 477.7 kHz, best around 3 to 4 U
Thanks Markus. That's a lot of work trying all those decodes, or maybe you have a script to automate the job? There's a lot of QSB on this band! Carrier off at 16:00:00 and QRTT for this band. That w
Thanks for your efforts, Markus. The TX is on again tonight with the same parameters. 73 Joe VO1NA Hi Paul and Joe, ? thanks for the signals. Got more successful decodes from Paul during the rest of
I can reproduce this using EbSynth and a weak near-field 9th harmonic signal. 2 to 3dB loss every time on a similar strength signal to last night's test. There is also an error floor showing up, abou
It's just getting dark here. The TX is now on. 477.7 kHz 8K19A 12 Chars 1 s elements on the half hour till dawn, fried fet, or mother nature's wrath. Best 73's Joe VO1NA
Hello Joe, many thanks for transmissions. Till now no EbNaut decodes here on JN80. Just some trace of your carrier on February 15 before 03.00UT and EbNaut-rx gives "**" on that period. I will contin
Also Riccardo IW4DXW from JN64 is sending an EbNaut message every every 30 minutes for 3 sessions starting 10:30 12 char, 1 s , 8K19A qrg=477695.00 Hz GL. 73, Domenico iz7slz Best 73's Joe VO1NA
The other difficulty at MF is of course the rapid phase variation and QSB, making EbNaut decodes a bit of a game of chance and luck. In that respect, this mode (at least the slow variants) seems mor
The last three transmissions from Riccardo have been decoded here: start car. sym. UT dB dB 23:00 15.7 1.8 23:30 18.5 7.9 00:00 15.4 4.8 The phase was again very variable, possibly explaining the lar
Unfortunately no significant carrier traces appeared on 477.700. Hi Markus, Domenico, Your efforts are appreciated. The higher phase stability of LF over MF on the TA path seems to be at play here.
Hello Joe, It appeared that propagation was rather poor last night. See attachment. 73, Roelof, pa0rdt The following section of this message contains a file attachment prepared for transmission using
Hello Roelof, Conditions and perhaps the aerial. The "rotated L" is on the ground and the monopole is in service until the RL is raised. There were some strong copies at your QTH, but generally weak.
