Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

Re: LF: 8270Hz

To: [email protected]
Subject: Re: LF: 8270Hz
From: Paul Nicholson <[email protected]>
Date: Tue, 12 Jan 2016 20:29:44 +0000
In-reply-to: <[email protected]>
References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2

Uwe wrote:

> Carrier on: 2016-01-09 17:00:00
> Message start: 2016-01-09 17:05:00
> Coding 8K19A
> Duration 02:37:52:00
> Chars 10
> Bits 1184
> Period 8,0

That should be 19 chars.

I spent 3 days trying to decode, but without success.
The following carrier measures 16.4 dB in 1 hour and
that should give me Eb/N0 around 0.1 dB which has a good
chance of decoding.   But for some reason it doesn't
decode.   Maybe the signal was a dB or so weaker than the
following carrier.  It must have been very close to the
limit.  Or perhaps the symbol timing is a bit out.

Also I used all of your recent long carrier transmissions,

 2015-12-30_00,+6h
 2015-12-30_20,+11h
 2016-01-01_00,+7h
 2016-01-05_00,+7h
 2016-01-06_00,+7h
 2016-01-09_20,+11h

and tried a 49 hour integration, non-coherent in 278 uHz,
using signal recorded by Mike Smith at Forest Virginia,
but nothing showed above noise.  The west-to-east path
is going to be a tough nut to crack, especially across
6667 km.

Mike is contemplating building a loop receiver similar to
mine which will help by maybe 6dB or more.

Really, someone should be looking for this carrier in
Canada or Newfoundland.  That has a much better chance.

--
Paul Nicholson
--



<Prev in Thread] Current Thread [Next in Thread>