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| To: | [email protected] |
|---|---|
| Subject: | Re: VLF: Alphas are back |
| From: | DK7FC <[email protected]> |
| Date: | Wed, 07 Aug 2019 15:45:44 +0200 |
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| In-reply-to: | <6DB8451D7F3D3947A5918808A59621EA845B2F9A@servigilant.vigilant.local> |
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Attached is a short mp3 audio file where you can listen to all 4 tones.
Signals coming from the H field were filtered, noise-blanked,
down-shifted by 12 kHz and then resampled to 12 kS/s. The recording is
from yesterday, 10:15 UTC.
Produced using: vtread -T2019-08-06_10:15:03,+60 /raw | vtcat -p | vtmix -c0,1,0 | vtfilter -h bp,f=14000,w=4000 | vtblank -a25 -d0.0005 -t100 | vtcat -S49 | vtmult -f12000 | vtmix -c1,-j | vtresample -r12000 -g100 | vtraw -ow | lame -b64 -mm - - > 4Alphas_shifted12k.mp3 73, Stefan
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