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Re: VLF: Back on 5.17 kHz / 58 km...

To: [email protected]
Subject: Re: VLF: Back on 5.17 kHz / 58 km...
From: DK7FC <[email protected]>
Date: Fri, 06 Jan 2017 11:54:00 +0100
In-reply-to: <[email protected]>
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Hello Markus,

In my announcement for the 8 character message i forgot to update the "duration" line. Of course it should be 23h 28min 0 sec. The transmission of the 4th was unintentionally interrupted, as explained in one of my previous mails.

I'll do some minor optimisations on the coil now and will be back again soon. There is more than one request BTW.

So i will run a carrier on 5170.001250 Hz then.

73, Stefan

Am 06.01.2017 10:48, schrieb Markus Vester:
Hi Stefan, Paul,

so that  makes a fine record of 5.17 kHz successes between the two of you! Wonder what will be possible when Stefan goes to max voltage on 2.97 kHz?

I'm trying to keep track of the 60 s PSK traces on the tree grabber. There was a 12.5 h transmission on Jan 4th, and a similar one lasting 23.5 h on 5th/6th. As the duration of 8 characters 16k25 should be 23h 28min, the latter was probably the right one.

I'd still like to look for a daytime carrier here, 1.25 mHz below or above 5170 Hz.

All the best,
Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: Paul Nicholson <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Fr, 6 Jan 2017 10:06 am
Betreff: Re: VLF: Back on 5.17 kHz / 58 km...

Stefan wrote:

> f = 5170.000000 Hz
> Start time: 04.Jan.2017 08:00:00 UTC
> Symbol length: 60 s
> Characters: 8
> CRC 16
> Coding 16K25A

> I will repeat the transmission starting [5th] 8 UTC...

Easy decode, +3.3dB with constant reference phase.

Decoder continues to run, I expect a better decode with
some phase pattern that compensates for the day/night

Paul Nicholson

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