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

[DK7FC <selberdenken@posteo.de>]

A second transmission is running now but it is a rainy day so the 
antenna current is a bit lower. Same message, symbol length, phase 
orientation and start time as on 03.Oct.2016.
73, Stefan

Am 05.11.2016 10:39, schrieb Paul Nicholson:
> Tried to decode *** messages from the overnight carrier Oct
> 10th/11th 18:00 to 06:00 and the best result was 2 chars 50
> second symbols 16K25A with 18 bit CRC at +1.0 dB, BER 42.8%,
> constant reference phase.
>
> It was an averagely noisy night.
>
> Looks like we'll have to use daytime signal and combine
> multiple days.  Probably a method we will need for 2970 Hz.
>
> > A message is sent several times and the sequences are
> > added until a decode appears.
>
> If added coherently.  Or send with longer symbols, splitting
> the sending across multiple days.
>
> Well I can test those two methods here with simulated signal and
> noise.
>
> --
> Paul Nicholson
> --