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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: Sun, 15 May 2016 23:43:25 +0200
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Ok Paul, thanks, and interesting as usual.

For the next attempt i can run 250 mA i think. Last night it was about 230 mA, a bit more than expected.
For a super long message, taking a few days, i.e. many day-night-day
changes, would you think that going from 100s to 200s will improve
things by about 3 dB?
How long do you record the VLF soundcard stream? Would it be possible,
for example, to transmit a 1 week long message, without an announcement
before the start? If not, what are the time limits?
I would like to try something heavy and use 200s symbols. We could train
that as long we are using such high frequencies :-)
73, Stefan


Am 15.05.2016 21:23, schrieb Paul Nicholson:
Reconstructed carrier of the successful 2016-05-14_21:40:02
message

 http://abelian.org/vlf/tmp/160515a.gif

S/N is 19.15 dB.

The unsuccessful message 2016-05-13_00:00:02

 http://abelian.org/vlf/tmp/160515b.gif

S/N is 11.67 dB.

Noise was 4.63 dB higher and the signal 2.86 dB weaker.

About 3dB too weak to decode.

Looking forward to the 19 char decode. With these signal
and noise variations, there's an element of luck involved!

--
Paul Nicholson
--





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