Re: VLF: First VLF detection DL > EA

[DK7FC <selberdenken@posteo.de>]

Very well Paul. A 15 dB improvement.
Maybe Jacek will have much better results as well, when improving the 
filters. and Eddie/G3ZJO?!
Am 01.12.2017 23:36, schrieb Paul Nicholson:
> The 17470.1 Hz signal from DK7FC is quite disappointing here
> in Todmorden.  I was expecting lots of ERP and a great S/N.
>
> Daytime S/N is between -28dB and -20dB in 1Hz.
> Daytime phase repeats within about +/- 25 deg.
>
> Nighttime, S/N is poor, best is about -29 dB and about
> half the nights it is not significant above noise. 
When applying the new filter, what are the S/N results from that older 
carrier transmission?

73, Stefan




Am 06.12.2017 13:02, schrieb Paul Nicholson:
> I wrote:
>
> > Decoded 'E' here, Eb/N0 = +11.7 dB.  Have to work on my
> > sferic blanker to put in some notches as Stefan suggested.
>
> I notched out JXN and HWU (or whatever it's called) with
>
>  vtfilter -e eqmap -h bp,f=17470,w=3000 -h bs,f=16400,w=600 
> -hbs,f=18300,w=800
> and re-ran.  Blanker drop factor went from 2.5% to 18% and now
> decodes with Eb/N0 = 26.8 dB!
>
> Maybe that's the problem with this band then, just getting
> the right filtering before the blanker.
>
> --
> Paul Nicholson
> --