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Re: LF: RE: WSPR-8 Test

To: [email protected]
Subject: Re: LF: RE: WSPR-8 Test
From: Stefan Schäfer <[email protected]>
Date: Fri, 21 Sep 2012 14:43:38 +0200
In-reply-to: <7E7DFBB4D102A04DB5ADC88D66628A4A0FB28B8C@ICTS-S-MBX5.luna.kuleuven.be>
References: <7E517D8BC1054A3388F253523A03931E@White> <7E7DFBB4D102A04DB5ADC88D66628A4A0FB28B8C@ICTS-S-MBX5.luna.kuleuven.be>
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HI Rik,

Am 21.09.2012 08:34, schrieb Rik Strobbe:

Hello Marcus, Stefan,

 

very interesting.

Some WSPR-8 followed by WSPR-2 sequences during daytime would show if the gain is 6dB as one could expect.

That's it. Today i want to provide exactly such a test signal, i.e. WSPR-8 at 50% TX and WSPR-2 at 50% TX between the gap.
I will lower the TX power by 6 dB. This should be sufficient anyway :-)

Markus will provide a zip file which contains all the files needed for automatic speed conversion and replay in the normal speed! So everyone can try WSPR-8 and WSPR-30 soon.

73, Stefan/DK7FC

 

73, Rik  ON7YD - OR7T


Van: [email protected] [[email protected]] namens Markus Vester [[email protected]]
Verzonden: vrijdag 21 september 2012 2:07
To: [email protected]
Onderwerp: LF: WSPR-8 Test

First decodes using 8-minute WSPR:
 
2012-09-21 00:00 
 DK7FC 
 0.137508 
 +7 
 0 
 JN49ik 
 1 
 DF6NM 
 JN59nj 
 175 
 91 
 2012-09-20 23:52 
 DK7FC 
 0.137508 
 +3 
 0 
 JN49ik 
 1 
 DF6NM 
 JN59nj 
 175 
 91
 
Between 23:36 and 23:43:20, Stefan was transmitting 8-times slow WSPR with low power on 136172 Hz. This was recorded here to an IQ file using SndInput from DL4YHF, and replayed 8x fast during the next 2-minute, slot starting 23:44. In the process the audio was frequency shifted from 670 to 2000 Hz, and added to the normal audio data for WSPR.  Thus with the 4x acceleration, Stefan's transmission appeared 8 instead of 2 Hz above center.
 
This is all still a bit improvised, but the concept seems to work.
 
Best 73,
Markus (DF6NM)
 
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