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Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz

To: rsgb_lf_gr[email protected]
Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz
From: Markus Vester <[email protected]>
Date: Thu, 12 May 2016 04:40:39 -0400
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> the coils sagged a bit into each other
 
Should we donate a few Lego blocks? ;-)
 
73, Markus
 
 
 
-----Ursprüngliche Mitteilung-----
Von: DK7FC <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Do, 12 Mai 2016 10:33 am
Betreff: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz

Hi Paul, VLF,

I have prepared my transmit site so i can run permanent transmissions now! Also the antenna current meter has been re-calibrated (actually no re-adjustment was necessary).

Just in case the extreme QRN will stop in the morning, i will run a new transmission:

f = 6470.00000 Hz
Start time: 12.05.2016   00:00:02 UTC
Symbol length: 100 s
Characters: 3
CRC 16
Coding 8K19A
Duration: 11h, 33m, 20s

Antenna current: 200 mA

Maybe this one will work better. And, to be honest, in the last transmissions the antenna current fell to about 170 mA after some time because the coils sagged a bit into each other due to the heat. But now this process should have stopped and the resonance was re-adjusted. I can measure a stable 205 mA now during the time of the observation.

73, Stefan



Am 11.05.2016 11:22, schrieb Paul Nicholson:

> I'm asking myselfe if you are working on the decode
> all the time

Yes, still working on the 19 char message.  I think I'm
about 1.3 dB short of decoding it.  Quite a challenge
because overnight 7th/8th was very noisy.

> This morning the QRN is very low, a pity that i have
> not been on the air.

The last few nights have been quiet.  Typical!

--
Paul Nicholson
--

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