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Re: VLF: 8270.1 Sunday 16:10

To: [email protected]
Subject: Re: VLF: 8270.1 Sunday 16:10
From: Paul Nicholson <[email protected]>
Date: Sun, 24 Jan 2016 18:36:50 +0000
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> Frequency: 8270.1 Hz
> Start time 16:10:01
> Polynomial: 4K19A, CRC 16 bit
> 13 characters
> Symbol Duration: 10 s

I wasn't able to decode this one here.  Signal calculator
says it's probably a few dB too weak.  You would have to
use at least 40 second symbols with that code and message
length.

Better to use 20 seconds and an 8K code (more constraints
beats the increased symbol errors).

10 seconds and a 16K better still if you can switch phase
fast enough.

Could not decode at Bielefeld or Cumiana either.

--
Paul Nicholson
--

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