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

[Paul Nicholson <vlf0403@abelian.org>]

> There have been 4 sunny days now.

Maybe your transmitter works better on sunny days?

I was able to get a decode from just the last four days:

 Day     Eb/N0  Phase  S/N in 2.5kHz
 161130   -7.2  133.6 -61.8
 161201   -6.6  154.3 -61.2
 161202   -7.0  172.4 -61.7
 161203   -3.7  151.2 -58.3

decoded with Eb/N0 = -0.2 dB at list rank 969420.

No other permutation of 3 to 10 days produces a decode.

> Now i have my local feedback channel again and can
> do a local EbNaut experiment with 1 second symbols
> on 6470 Hz.

Yes to test the phase switching, compare the carrier S/N
after decoding a message, with the carrier S/N after
decoding unmodulated carrier at the same code settings.

> The plan is to run 100 mA on 2970 Hz for the first time,

I'll look for it but I don't expect to see anything. But,
it is no effort to look and we might be lucky with some
freak conditions.

--
Paul Nicholson
--