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Date: Mon, 11 Dec 2017 15:21:25 +0100
From: DK7FC <selberdenken@posteo.de>
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Subject: Re: VLF: Transatlantic success East to West
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Am 10.12.2017 21:07, schrieb Paul Nicholson:
> Yes indeed and it is also the longest distance message decode
> at VLF.
Oh, nice! :-)
>
> Mike has put a lot of work into his receiver and I'm very
> pleased to see this well-deserved success for him.  He's
> thought about putting up a loop receiver but the usual
> obstacle is three channel A/D.   We're both interested in
> having another look at the Octo card to see if it can
> be made to work well enough.
Yes it should. Why not? Maybe this message detection, and the next one, 
pushed the motivation in this direction (3-angle RX).

>
> > For tonite i would start the new 3 charcter message on
> > the TA path.
>
> Yes that looks about the right settings.  Three good nights
> might do it if we're lucky. But realistically it'll probably
> take more.  Slightly worryingly, the phase of the two
> 1-char messages was 173 deg and 88 deg.  Hopefully that
> first reading is upset by noise, repeats wont stack
> very well if that phase is genuine.
Despite heavy rain the first message was fully transmitted. Just 24 kV 
on the wire, you know.
So you should already know the message from your own RX. Can you already 
determine what we got on Mike's RX from that night? Maybe Eb/N0= -4.5 dB?
It would be interesting to have an overview of the daily Eb/N0 and phase.

Am 11.12.2017 11:41, schrieb Paul Nicholson:
> Spent some time with LWPC measuring the T/A path at some
> different frequencies.   The figures below are the extra loss
> on the east-to-west, compared with west-to-east.
>
> Midnight UTC:
>
>  17.4 kHz:    3 dB
>   8.2 kHz:   12 dB 
...so just a 9 dB difference? I would say it is worth to try it on 8270 
Hz! Just a few days stacked and you should see a peak growing...

73, Stefan