Re: VLF: Transatlantic success East to West

[DK7FC <selberdenken@posteo.de>]

Hi Paul,

Again thanks for the summary.
Ok i see, it makes no sense that way. The last > 100 transmit hours did 
not lead to a success...
Does the message decode when correcting the phase? I think not.

BTW, instead of doubling my antenna current, Mike could build up a 3 
axis RX :-) This would give us an average gain of at least 6 dB i think.
And we need to learn to predict/estimate the phase, if possible. Where 
are the propagation experts?! :-)
73, Stefan


Am 22.12.2017 17:16, schrieb Paul Nicholson:
> Stefan wrote:
>
> > f = 17470.1000 Hz
> > Start time: 18.Dec.2017  21:30:00 UTC
> > Symbol period: 45 s
> > Characters: 2
> > CRC bits: 14
> > Coding 16K21A
>
> > Can you give me a feedback from the last night?
>
> Now with 4 nights:
>
>  18/19th Eb/N0 = -4.9 dB, S/N -39.6 dB in 1Hz, phase 110.4
>  19/20th Eb/N0 = -6.5 dB, S/N -41.1 dB in 1Hz, phase 125.6
>  20/21st Eb/N0 = -7.8 dB, S/N -42.4 dB in 1Hz, phase -22.5
>  21/22nd Eb/N0 = -9.4 dB, S/N -44.0 dB in 1Hz, phase  55.6
>
> No improvement on the earlier stacking: best is still
> 18/19 + 19/20 to give Eb/N0 = -2.7 dB
>
> This isn't going to work without a repeatable night phase.
>
> --
> Paul Nicholson
> --