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| Subject: | Re: VLF: Carrier on 3675.005 Hz / EbNaut - YES |
| From: | Markus Vester <[email protected]> |
| Date: | Sat, 12 Aug 2017 17:08:20 -0400 |
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It looks like we got a valid decode of Stefan's 16 hour transmission from the DL0AO cardioid antenna.
I had also attempted an early decode from a file ending 18:12 UT. This one appeared to be even better (rank 0, +2.2 dB carrier EbN0), perhaps because it ended before the QRN increased. We had no success with the earlier 24 h transmissions on Aug 10th and 11th, neither single days nor both stacked - surely due to much higher QRN levels than today. BTW Each decode attempt also produced several false hits with relatively good ranking, so a longer CRC might be preferable. All the best, Markus (DF6NM) -----Ursprüngliche Mitteilung----- Von: DK7FC <[email protected]> An: rsgb_lf_group <[email protected]> Verschickt: Fr, 11. Aug 2017 15:32 Betreff: Re: VLF: Carrier on 3675.005 Hz / EbNaut
...looks like there was no decode from DL0AO from that transmission. It
was one of the noisiest days again. I already expected that result and
repeated the same message again, running today (24 hours, ending 0
UTC). With Markus' tool to stack the resulting files, they could gain 3
dB by stacking these two transmissions.
Today the noise is much lower. Attached is a RDF spectrogram showing the BPSK as recveived on the tree. I'm announcing another test, again trying 3 characters, even in a shorter time, avoiding the night time where the SNR is much lower: f = 3675.005000 Hz Start time: 12.August.2017 04:00:00 UTC Symbol period: 80 s Characters: 3 CRC bits: 7 Coding 16K21A Duration: 16h Antenna current: 160 mA 73, Stefan Am 09.08.2017 16:48, schrieb DK7FC: Hi VLF,
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