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Re: VLF: Trying the impossible, once more

To: [email protected]
Subject: Re: VLF: Trying the impossible, once more
From: DK7FC <[email protected]>
Date: Fri, 13 Oct 2017 14:37:33 +0200
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Thanks for the good report. The same transmission is repeated today. And tomorrow, a last time.

There was a decode at RC4HAA, even with good Eb/N0, but the message is wrong! Looks like their phase is not stable, the PPS pulse looks not as it should. The sample rate is corrected but there is a high jitter. You can see it on the Alpha trace. Anyway i think about a transmission on 8270 Hz with the other coil (700 mA), to try to leave a trace on their spectrogram. If something appears, it could be convincing that it is worth to put some more effort in the system by generating a clean PPS+NMEA signal for SpecLab...

73, Stefan

Am 13.10.2017 00:36, schrieb Paul Nicholson:

Stefan wrote:

> f = 6470.100000 Hz
> Start time: 12.October.2017  06:00:00 UTC
> Symbol period: 180 s
> Characters: 1
> CRC bits: 0
> Coding 8K19A

A great signal in Todmorden, Eb/N0 = 15.9, phase -114.3.

Has the potential to go a long way!   It actually decodes
correctly here after only 980 seconds of signal, about 5.5
symbols out of 192.

--
Paul Nicholson
--


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