To: | [email protected] |
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Subject: | Re: VLF: First VLF detection DL > EA |
From: | DK7FC <[email protected]> |
Date: | Wed, 06 Dec 2017 13:51:39 +0100 |
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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 abouthalf 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) withvtfilter -e eqmap -h bp,f=17470,w=3000 -h bs,f=16400,w=600 -hbs,f=18300,w=800and 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 -- |
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