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

[DK7FC <selberdenken@posteo.de>]

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
> --