For those interested, the
slowWSPR utilities can be downloaded at
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)
Sent: Friday, September 21, 2012 2:07 AM
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)
