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

from [Paul Nicholson] [Permanent Link][Original]
To: [email protected]
Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz
From: Paul Nicholson <[email protected]>
Date: Tue, 22 Nov 2016 15:25:04 +0000
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Stefan wrote:

> f = 6470.00000 Hz
> Start time: 20.11.2016   08:00:00 UTC (Daily repetition)
> Symbol length: 20 s
> Characters: 20
> CRC 16
> Coding 8K19A

It needed the sum of three repeats:

Copied 'STEFAN&[email protected]!'  Eb/N0 = +0.1 dB

S/N of the combined signal:  21.21 dB in 40.6 uHz

20th: Eb/N0 = -2.3 dB, S/N -59.6 dB in 2500Hz, phase 130.3 deg

21st: Eb/N0 = -5.4 dB, S/N -62.7 dB in 2500Hz, phase 117.9 deg

22nd: Eb/N0 = -4.3 dB, S/N -61.6 dB in 2500Hz, phase 150.6 deg


--
Paul Nicholson
--
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