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

To: [email protected]
Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz
From: DK7FC <[email protected]>
Date: Fri, 13 May 2016 02:04:35 +0200
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Hi Paul,

Thanks! :-) That is correct!!! But why is the Eb/N0 so high, just the low QRN in the morning? Impressing!
I'll continue with a longer message. Before i go to 5.17 kHz i would like to pass a longer message through, like 20 chars or so.
But now let's try 6:

f = 6470.00000 Hz
Start time: 13.05.2016   00:00:02 UTC
Symbol length: 100 s
Characters: 6
CRC 16
Coding 8K19A
Duration: 15h, 33m, 20s

Antenna current: 200 mA

I'm watching the input signal of my feed back probe. It shows how the antenna current varies with rain and temperature (affects the resonance frequency). An inofficial capture is at http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/TX.jpg . -37.5 dB equals 186 mA.

73, Stefan


Am 12.05.2016 21:29, schrieb Paul Nicholson:

> f = 6470.00000 Hz
> Start time: 12.05.2016   00:00:02 UTC
> Symbol length: 100 s
> Characters: 3
> CRC 16
> Coding 8K19A

Copied 'UFB' Eb/N0 = +5.1 dB.

Carrier S/N: 11.21 dB in 24.0 uHz

--
Paul Nicholson
--


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