Re: LF: Experimental software for WSPR-8 and -32

[Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>]

LF!

I just prepared the new set of files and successfully transmitted the normal WSPR-2. Got decodes from the active RX stations. So this is working at least.

Now i set up for WSPR-8 and will run a beacon in 50% TX mode on 137.43 kHz. TX pwr is 6 dB lower as usual.
Are there already some WSPR-8 reporters? Reports apprechiated.

In recent tests using WSPR-8 i was transmitting on 136.172 kHz but this covers to much BW there, about 1.5 Hz. For WSPR-32 tests we may discuss for a suitable slot. The EU-60 QRSS slow should be clean from other non-spectrogram-needing modes i find. However a few 10 or 20 Hz above that slot would allow to run splitted spectrograms on the grabbers, allowing to display the traces. Not sure who will at all send in WSPR-32? Should we use the normal digimode slot or a TA<> EU splitted slot? Ideas please.

73, Stefan/DK7FC

PS: WSPR-32 is not possible so far for me because my watchdog circuit interrupts transmissions longer than 10 minutes for savety reasons. For DFCW this is no problem due to the gaps but WSPR is a continuous transmission...


Am 21.09.2012 23:53, schrieb Markus Vester:

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)