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
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