LF: Experimental software for WSPR-8 and -32

["Markus Vester" <markusvester@aol.com>]

For those interested, the slowWSPR utilities can be downloaded at

 

http://df6nm.bplaced.net/wspr/slowWSPR.zip (97 kB)

 

There is a readme file which will hopefully give you an idea of how to proceed. But beware, this is all very improvised, please don't expect plug and play...

 

Best 73,

Markus (DF6NM)

 

From: Markus Vester

Sent: Friday, September 21, 2012 2:07 AM

To: rsgb_lf_group@blacksheep.org

Subject: 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 
2012-09-20 23:44   DK7FC   0.137508   -4   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)