|
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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