To: | [email protected] |
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Subject: | Re: LF: SAQ |
From: | Domenico IZ7SLZ <[email protected]> |
Date: | Fri, 26 Oct 2018 00:20:50 +0200 |
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Hi Stefan, Thanks for informations on your temporary setup for SAQ. For this last SAQ reception, I have used vlfrx-tools to acquire (vtcard) and record (vtwrite) the VLF signal coming from E-probe antenna.Then filters, NB and vtvorbis have been used for stream the 'RF' to the other pc where Spectrum Lab is running. vtfilter -v -h bp,f=17200,w=3000 @input:1 | # Pre-filter before blanking vtfilter -v -a th=5 | # hum filter vtblank -v -a15 -d0 -t300 | # sferic blanker settings vtresample -v -r 48000 | # Reduce to 48000 sample pairs/sec vtvorbis -v -ep -t -q1 -kn 1236 #port 1236 So, in a similar way as your setup Stefan, Spectrum Lab here uses this stream, a bp filter with a frequency shift (to obtain a central frequency of 700 Hz) and an AGC (slow) before the D/A converter (see attached screenshot). Maybe there is a better way to stream the raw audio to a Windows PC but this i'm using is working ok. I also use this method to stream LF audio
(filtered and timestamped by vlfrx-tools)
into another pc where SL and OPDS are running. Any suggestions and improvements are welcome. 73, Domenico IZ7SLZ On Thu, 25 Oct 2018, 09:30 DK7FC, <[email protected]> wrote: Hi Domenico,
saq-setup.JPG |
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