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Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz

To: [email protected]
Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz
From: DK7FC <[email protected]>
Date: Sat, 14 May 2016 14:37:23 +0200
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Hi Paul,

Hmm, that's a pity. Maybe it would be useful to run a beacon, periodically the same message in shorter symbols, maybe 40s. A single character would be already fine, like 'R'. This would take 3:33:20 to be sent. I could do this each 4 hours. Or i can send a simple carrier for a few days. However i want to build a circuit which keeps the antenna current constant, even during rain, so the ERP stays constant!
73, Stefan

Am 14.05.2016 12:59, schrieb Paul Nicholson:
Stefan wrote:

> f = 6470.00000 Hz
> Start time: 13.05.2016   00:00:02 UTC
> Symbol length: 100 s
> Characters: 6

I haven't been able to decode this one.   The average noise
was 3.7 dB higher than the previous successful message, so
there should still be a couple of dB to spare.

I've tried a wider range of phase search in case the
day/night phase change was more than expected.

So far it seems that 6.47 is more variable and unpredictable
than 8.27 which is opposite to what I'd expect.

--
Paul Nicholson
--





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