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Re: VLF: Transatlantic success East to West

from [DK7FC] [Permanent Link][Original]
To: [email protected]
Subject: Re: VLF: Transatlantic success East to West
From: DK7FC <[email protected]>
Date: Thu, 21 Dec 2017 22:43:10 +0100
Cc: Michael Smith <[email protected]>
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Thanks Paul,
Terrible, it becomes worese again :-( Quite a struggle. But i (we) need to stay relaxed. 
The 4th transmission is now running. Let's see what it brings.
It would be interesting to learn and predict the phase. Why do these changes happen? Just by chance? The first two nights were quite stable but why is the second almost in opposite phase? 

73, Stefan

Am 21.12.2017 19:41, schrieb Paul Nicholson:


Stefan wrote:

> f = 17470.1000 Hz
> Start time: 18.Dec.2017  21:30:00 UTC
> Symbol period: 45 s
> Characters: 2
> CRC bits: 14
> Coding 16K21A

After 3 nights:

 18/19th Eb/N0 = -4.9 dB, S/N -39.6 dB in 1Hz, phase 110.4
 19/20th Eb/N0 = -6.5 dB, S/N -41.1 dB in 1Hz, phase 125.6
 20/21st Eb/N0 = -7.8 dB, S/N -42.4 dB in 1Hz, phase -22.5

Stacking 18/19 + 19/20 gives Eb/N0 = -2.7 dB.

--
Paul Nicholson
--
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