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| To: | "[email protected]" <[email protected]> |
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| Subject: | Re: ULF: Finally 100 mA on 2.97 kHz / 65 km ULF experiment |
| From: | David Hine <[email protected]> |
| Date: | Fri, 9 Dec 2016 20:52:14 +0000 (UTC) |
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This may seem VERY silly, but do you see your signals sometimes when not transmitting? If you do please let me know. Also does the received frequency / timings between transmissions get changed very slightly? Silly questions? -but not quite so silly at ULF -there are explanations if you notice these things Please let me know. Regards, David From: DK7FC <[email protected]> To: [email protected] Cc: Renato Romero <[email protected]> Sent: Friday, 9 December 2016, 14:43 Subject: Re: ULF: Finally 100 mA on 2.97 kHz / 65 km ULF experiment
After doing a lot of modifications here on the TX side, the effect
still exists. I can't get rid of the unstable phase shown on the VLF
tree grabber. One thing to mention is that the phase seems to change slowly, no sudden phase jumps. Thus the peak is 40 dB S/N in 47 uHz. So obviously there were much less uncorrected phase glitches than expected in the first moment when i saw the effect. Just to be sure i downgraded to the last SpecLab version, the one i used since the last month. But the effect still exists. Next to note is the i never saw the effect in my last tests. I still have captures showing a very clear trace on 2970 Hz during the 31 km experiment. OK that was in September. The QRN levels may have been a bit higher and the signal was 7 dB weaker. So maybe the effect was just hidden in the noise? Next i found that some SpecLab configurations seem to be corrupted by forth and back installing old (V2.90b2) and new (V2.92b2) version. So i am now using the old version and a config file that was never opened in the new version. It all seems to work fine on the TX side but i can still see the effect. BTW i even disabled the NB and checked if this makes a change. But thill the same result. The TX schedule for the experiment is: 07.DEC: TX 2970.000 Hz (antenna current between 105...110 mA all the time) since 13:30 UTC. The recording has started about 15 UTC. 08.DEC: EbNaut 5ch, 80s, 8K19A @ 2970.000 Hz starting 7 UTC, ending 18:22:40 UTC. Then, carrier at 2970.000 Hz. Some interruptions happened in the late carrier. 09.DEC: 0 UTC starting DFCW-10800 (3h per element), 'dit' at 2969.9975 Hz, 'dah' at 2970.000 Hz. The message is 'FC'. Between F and C there is a break of 7 hours. In this time, starting 15 UTC: EbNaut 2ch, 68s, 8K19A @2970.000 Hz. 10.DEC: End of DFCW message 'FC' at 13 UTC. Then, EbNaut 5ch, 80s, 8K19A @ 2970.000 Hz starting 13 UTC (repetition of the message of 08.DEC.) 11.DEC: End of EbNaut message at 0:22:40 UTC. Then, carrier on 2970.000 Hz until 20 UTC. The recording will stopp in the late morning, due to space limitations of the 32 GB USB-stick. >From the local recording i tried to decode the 5ch EbNaut message. But it didn't decode. I just got a '*****' message and a false decode. This is strange. The dots are quite concentrated in the two horizontal lines which indicates a stable phase. See attachment. Also the signal peak is strong and narrow. But in the red field there is nothing to see... This EbNaut message was transmitted with the new PSK config in SL. It is the reason why i will repeat the message in the end of the experiment again, using the old settings and version. I should have done more pre-tests before starting the experiment. But now it is running. Well, the main goal is to detect a clear trace of my signal in a spectrogram running at 300 uHz or so. The signals do not look bad on the local grabber, not at all, despite the strange (propagation?) effect. I'm still optimistic... 73, Stefan Am 08.12.2016 11:31, schrieb Markus Vester:
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