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Re: VLF: Alphas are back

To: [email protected]
Subject: Re: VLF: Alphas are back
From: DK7FC <[email protected]>
Date: Wed, 07 Aug 2019 15:45:44 +0200
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/simple;; s=2017; t=1565185546; bh=XcijTAjEwSGkeXwKFdrnyt2snyFDbwXgnsKzJwNNNGk=; h=Date:From:To:Subject:From; b=jiDTy7m9a2B/FxQHfliaH95U3mwje6xZspNaBkkGtg/B2+tKHk6MR3DIbtacNh8lW Lj0dKhnJkaxzjHxdb11jDKdbJ0K5gPmOcd2UpYC3jrGLpTffotCPxDEGD/xWxVGgjq nfroYSkOHE+bOXu8+OXSIvAHGP7IbgBz4kK4bblYsxBXgzrpETWgi8YOV/kGQQSe+w mkrHW8b6IbmOSpGCddZiF/31r8WUDq9xDL0QIjqSd5qlHzFO2u/aT1r6jL1mxWMBkH YMuIw/B6RH6Zz2PBoONOr/L0tWwB6DeNHfp91cvgSlM6kZ3xxp+1og8ppHlZiwS6ut qkHemHJwus2bQ==
In-reply-to: <[email protected]cal>
References: <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]cal>
Reply-to: [email protected]
Sender: [email protected]
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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

Attachment: 4Alphas_shifted12k.mp3
Description: audio/mpeg

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