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Re: LF: 477 khz op8 deep search in km07ks last night !!

from [Markus Vester] [Permanent Link][Original]
To: <[email protected]>
Subject: Re: LF: 477 khz op8 deep search in km07ks last night !!
From: "Markus Vester" <[email protected]>
Date: Sun, 30 Nov 2014 11:40:58 +0100
Cc: "Dionysios Vlachiotis" <[email protected]>
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20140625; t=1417344064; bh=emBOX32n88B3Iq8mgbqw4RyMzST/gJetkYVB2khscmQ=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=P/+qCqntUjfrF3W3tRR+b0HKqQA5wcmzKHw64OaEXV9RnoDIX6cB16yFxF+Q44Faq gfRDEy3IZXviurhyYdoO+1bFVwGdZtWxKx4LedTa4isphEF0jJPyAdJKfLsq1r7v7z MjFSS4Qf5OnBzqfl3mJXzChSLDi0fDfKEE85d2aA=
Importance: Normal
References: <3AB526895C1F453FB6A00609FD46D3B8@eplwin764i3> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Hi Domenico,
 
this may have been due to crossmodulation from the receiver AGC, which is visible in the spectrogram: Whenever the strong signals from SV3DVO and IW4DXW were present simultaneously, there were also IM-3 sidebands appearing symmetrically around their frequencies. I presume that the the false detections are generated by the AGC reacting on SV3DVO's keying, and impressing the inverse modulation of this sequence (which happens to be similar to VE7BDQ) onto the other transmission.
 
My recommendation would be to disable the AGC in SpecLab (L4 blackbox), and also in the receiver.
 
However please set the gain such that the noise level in the spectrogram is still above about -90 dB, which is necessary to avoid rounding errors due to the integer data export from SpecLab to opds. Alternatively, you can untick "use integer numbers only" in SpecLabs "Export of FFT results" settings, providing unlimited dynamic range at the cost of larger temporary data files.
 
Best 73,
Markus (DF6NM)
 

From: IZ7SLZ
Sent: Sunday, November 30, 2014 10:44 AM
Subject: Re: LF: 477 khz op8 deep search in km07ks last night !!

Good day to all,

Here also my OPDS8 correlations for signals received on MF last night:

I had one quite good correlation of VO1NA ! Thanks Joe for your transmissions.

Can somebody help me to identify the signal that OPDS program shows 5 times with the call of VE7BDQ ?


IZ7SLZ JN80NU Opera-32 correlation  by DF6NM

   date      time   call   distance  frequency bandwidth  snr    correlation

2014-11-30 08:00:42 SV3DVO   489km 478494.556Hz  40mHz -36.5dBOp  72% 19.6dB
2014-11-30 07:35:45 SV3DVO   489km 478494.589Hz  57mHz -35.7dBOp  84% 20.4dB
2014-11-30 07:10:50 SV3DVO   489km 478494.587Hz 116mHz -37.6dBOp  95% 20.3dB
2014-11-30 06:45:53 SV3DVO   489km 478494.593Hz  69mHz -32.4dBOp  82% 20.7dB
2014-11-30 06:20:58 SV3DVO   489km 478494.593Hz  48mHz -26.5dBOp  89% 21.7dB
2014-11-30 05:56:01 SV3DVO   489km 478494.593Hz  23mHz -30.5dBOp  77% 19.7dB
2014-11-30 05:30:56 SV3DVO   489km 478494.583Hz  42mHz -25.0dBOp  89% 21.9dB
2014-11-30 05:06:02 SV3DVO   489km 478494.596Hz  19mHz -20.4dBOp 100% 20.9dB
2014-11-30 04:41:00 SV3DVO   489km 478494.579Hz  69mHz -25.6dBOp  93% 20.5dB
2014-11-30 04:16:03 SV3DVO   489km 478494.591Hz  50mHz -19.3dBOp  80% 21.5dB
2014-11-30 03:51:08 SV3DVO   489km 478494.606Hz  55mHz -19.0dBOp  91% 21.7dB
2014-11-30 03:26:11 SV3DVO   489km 478494.596Hz 116mHz -22.5dBOp  78% 21.6dB
2014-11-30 03:01:16 SV3DVO   489km 478494.600Hz  63mHz -19.1dBOp  93% 21.5dB
2014-11-30 02:45:35 VO1NA   5445km 478478.592Hz 477mHz -33.7dBOp  72% 16.3dB :-)
2014-11-30 02:43:48 VE7BDQ  9286km 478500.746Hz 614mHz -32.5dBOp  99% 15.7dB :-\
2014-11-30 02:37:27 IW4DXW   610km 478500.504Hz 687mHz -99.9dBOp  87% 20.1dB
2014-11-30 02:36:19 SV3DVO   489km 478494.612Hz  38mHz -19.8dBOp  77% 20.7dB
2014-11-30 02:12:30 IW4DXW   610km 478500.538Hz  99mHz -30.1dBOp  59% 20.2dB
2014-11-30 02:11:24 SV3DVO   489km 478494.661Hz  21mHz -20.4dBOp  94% 21.0dB
2014-11-30 01:56:08 PA3ABK  1543km 478526.709Hz 563mHz -18.4dBOp 100% 20.8dB
2014-11-30 01:53:56 VE7BDQ  9286km 478500.278Hz 566mHz -36.8dBOp 100% 15.6dB
2014-11-30 01:47:35 IW4DXW   610km 478500.502Hz 668mHz -21.4dBOp  97% 21.1dB
2014-11-30 01:36:40 G0NBD   2056km 478528.494Hz 435mHz -18.3dBOp  48% 15.7dB
2014-11-30 00:58:10 SV3DVO   489km 478494.665Hz  13mHz -21.1dBOp 100% 22.0dB
2014-11-30 00:49:31 SV3DVO   489km 478494.661Hz  15mHz -19.3dBOp  86% 22.0dB
2014-11-30 00:43:52 G3XDV   1796km 478463.135Hz  13mHz -37.5dBOp 100% 17.9dB
2014-11-30 00:39:54 SV3DVO   489km 478494.671Hz  11mHz -19.8dBOp 100% 21.5dB
2014-11-30 00:31:25 SV3DVO   489km 478494.680Hz  13mHz -18.1dBOp  94% 21.9dB
2014-11-30 00:24:29 G6AVK   1736km 478501.659Hz  15mHz -40.4dBOp  83% 17.0dB
2014-11-30 00:22:15 SV3DVO   489km 478494.698Hz  11mHz -18.7dBOp 100% 21.7dB
2014-11-30 00:13:42 SV3DVO   489km 478494.703Hz  15mHz -18.4dBOp  84% 22.1dB
2014-11-30 00:04:26 IW4DXW   610km 478500.532Hz  13mHz -18.7dBOp  58% 17.7dB
2014-11-30 00:04:26 SV3DVO   489km 478494.696Hz  15mHz -21.0dBOp 100% 21.0dB
2014-11-29 23:58:40 G3XDV   1796km 478463.169Hz  13mHz -34.7dBOp  97% 18.7dB
2014-11-29 23:55:04 SV3DVO   489km 478494.682Hz  34mHz -20.2dBOp  92% 21.6dB
2014-11-29 23:49:54 VE7BDQ  9286km 478500.532Hz  15mHz -31.3dBOp 100% 15.6dB
2014-11-29 23:44:15 SV3DVO   489km 478494.686Hz  15mHz -19.7dBOp  80% 21.0dB
2014-11-29 23:43:33 IW4DXW   610km 478500.519Hz 404mHz -36.3dBOp  86% 20.7dB
2014-11-29 23:34:56 SV3DVO   489km 478494.675Hz  42mHz -22.7dBOp  89% 21.4dB
2014-11-29 23:20:00 SV3DVO   489km 478494.669Hz  40mHz -21.6dBOp 100% 21.7dB
2014-11-29 23:11:26 SV3DVO   489km 478494.644Hz  40mHz -21.5dBOp  87% 21.7dB
2014-11-29 22:58:09 SV3DVO   489km 478494.629Hz  59mHz -18.3dBOp 100% 21.9dB
2014-11-29 22:55:57 VE7BDQ  9286km 478500.673Hz 641mHz -34.1dBOp 100% 15.9dB
2014-11-29 22:49:36 IW4DXW   610km 478500.471Hz  57mHz -19.2dBOp  97% 17.8dB
2014-11-29 22:48:17 SV3DVO   489km 478494.637Hz  19mHz -15.8dBOp 100% 22.1dB
2014-11-29 22:38:56 SV3DVO   489km 478494.633Hz  32mHz -17.0dBOp  89% 21.8dB
2014-11-29 22:28:55 SV3DVO   489km 478494.629Hz  32mHz -16.1dBOp  88% 22.0dB
2014-11-29 22:21:54 VE7BDQ  9286km 478500.713Hz 574mHz -34.2dBOp 100% 16.0dB
2014-11-29 22:15:33 IW4DXW   610km 478500.437Hz 633mHz -31.2dBOp  96% 20.8dB
2014-11-29 22:01:18 PA3ABK  1543km 478526.562Hz 454mHz -24.0dBOp  89% 20.6dB
2014-11-29 21:47:59 VE7BDQ  9286km 478500.444Hz  51mHz -31.5dBOp 100% 15.8dB
2014-11-29 21:45:59 SV3DVO   489km 478494.669Hz  21mHz -21.4dBOp 100% 20.3dB
2014-11-29 21:41:38 IW4DXW   610km 478500.383Hz 723mHz -31.3dBOp  85% 21.3dB
2014-11-29 21:25:59 SV3DVO   489km 478494.608Hz  15mHz -18.3dBOp 100% 21.9dB
2014-11-29 21:16:33 SV3DVO   489km 478494.596Hz  65mHz -30.0dBOp  98% 21.7dB
2014-11-29 21:08:17 IW4DXW   610km 478500.368Hz 568mHz -20.6dBOp  77% 20.8dB
2014-11-29 20:54:33 SV3DVO   489km 478494.621Hz  19mHz -19.9dBOp  98% 21.6dB
2014-11-29 20:54:04 PA3ABK  1543km 478501.566Hz 549mHz -99.9dBOp  78% 18.3dB
2014-11-29 20:44:14 SV3DVO   489km 478494.638Hz  21mHz -18.3dBOp 100% 21.7dB
2014-11-29 20:41:21 VE7BDQ  9286km 478500.380Hz  34mHz -23.2dBOp  94% 15.6dB
2014-11-29 20:38:28 G3XDV   1796km 478484.392Hz  15mHz -37.1dBOp  99% 17.4dB
2014-11-29 20:35:00 IW4DXW   610km 478500.164Hz 711mHz -30.5dBOp  68% 20.0dB
2014-11-29 20:01:38 IW4DXW   610km 478500.359Hz 687mHz -20.1dBOp  85% 20.4dB
2014-11-29 19:39:37 G0NBD   2056km 478525.299Hz 372mHz -21.7dBOp  61% 16.7dB
2014-11-29 19:28:20 IW4DXW   610km 478500.160Hz 694mHz -20.9dBOp  76% 21.0dB

73 and good Sunday
Domenico/ iz7slz
JN80NU Putignano - Apulia (Italy)


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