The Weak Signal Propagation Reporter Network is a group of amateur radio operators using K1JT's MEPT_JT digital mode to probe radio frequency propagation conditions using very low power (QRP/QRPp) transmissions. The software is open source, and the data collected are available to the public through this site.

Hello every body, and happy new year for all.

In the little spare time during xmats (between drinks and happiness) I developed the initial structure for the graph plotting, and 2 simple graph (attached to this post) for evaluation, the plots shows only data for dec 1 to dec 16 (that's all data i have downloaded before xmats holidays, remember I only have Internet in my work place, a dialup at 33kbps)

Tell me what you think about it, and give me ideas for new plots.


For more than month I am running RX WSPR with my ZetaSDR receiver, and Rocky software on 80 m. Despite the "antenna" which is just ~17m of wire in building closed environment and industrial site, results are quite good. When conditions are better WSPR stations of Uk and around are received even in daytime. Planning to run test on fullsize 80 m antenna. The only problem is that frequency of received station is displayed incorrectly by several Hz, because Rocky can not change freq in Hz. Will see a solution for that.

MY bug list!

Bug #1
Intermittently Missing audio devices in dropdown menu.

Crash #1
Hello everyone,

I have gotten WSPR SVN version to build on my x64 system with the
following software below.

WSPR will intermittently display the blue spectrum data and process only
3 intervals before giving a Segmentation fault error and crashing.

Has anyone see this problem before?
I'm currently stuck at this point.

Any advise would be appreciated.



My system configuration:

Ubuntu 9.10 x64

Linux 2.6.31-16-server #53-Ubuntu SMP Tue Dec 8 05:08:02 UTC 2009 x86_64

ii python2.5-dev 2.5.4-1ubuntu6
i python-numpy 1:1.3.0-3
ii python-imaging-tk 1.1.6-3ubuntu1
ii python-pmw 1.3.2-3
ii libportaudio2 19+svn20090620-0ubuntu1
ii libportaudio2 19+svn20090620-0ubuntu1
ii libsamplerate0-dev 0.1.7-2
ii portaudio19-dev 19+svn20090620-0ubuntu1
ii g95 0.92-20090618

Moved house in july 2009. No antennas at the moment but I'll give it another try.
Made me an FD4 antenna. The problem is that the antenna is not installed. It is just lying on the lawn from east to west.
But it kinda works :-)

Now monitoring 30m with the preamp from the ic725 switched on and tuned with the mfj 941e.

I am so happy that someone picked up my 200 µW signal on 80 m! Here are the bigears:
2010-01-02 14:50 3.594008 -19 0 JN59ns 0.001 DF6MK JN68ik 188 142
2010-01-02 14:44 3.594008 -28 0 JN59ns 0.001 DF6MK JN68ik 188 142
2010-01-02 14:34 3.594008 -26 0 JN59ns 0.001 DF6MK JN68ik 188 142
2010-01-02 14:34 3.594008 -32 0 JN59ns 0.001 DH5RAE JN68pv 185 121

WSPR is so much fun - tnx de Johannes DL9NEF

1508 -26 -2.2 10.140298 0 GW4SDO IO83 30 in JN89oo

Do not be deceived by the statistics of randomly fluctuating quantities.

At signal levels close to the WSPR threshold, successive measurements of S/N will not be identical. This is a measurement issue, and is true even in the absence of actual signal fading. Upward and downward fluctuations are equally likely and will have similar magnitudes when stated as power levels. But when stated in dB, downward fluctuations will be much larger than upward ones.

Suppose the average ratio of signal to noise is 0.0015, with measurement-to-measurement fluctuations of +/-0.0010. (These are perfectly reasonable numbers for a marginal WSPR signal.) Then in dB we have

S/N (upward) = 10*log(0.0025) = -26.0 dB
S/N (average) = 10*log(0.0015) = -28.2 dB
S/N (downward) = 10*log(0.0005) = -33.0 dB

So occasionally you'll see WSPR report S/N values as low as -33 dB, because of measurement fluctuations, even if the "true" S/N was -28 dB.


now starting WSPRing today for the first time and after a time of running all rx-reports show a drift of -1 of my signal. I think it could be a thermal effect on the trx (transmitting 2 minutes with 5 watts output could heat a little bit up inside of this nice trx).

Are there any known issues with this trx? Is the Yaesu FT-857D known for "running away" a little bit?

I take an eye on it.

2009-12-28 19:23 switch from 50µW to 1mW
20:36 to 10mW
20:57 to 5 mw
21:47 to 2.5mw
23:00 to 1mw
sorry I had to test with a new local station.

Last night I saw DM3XRF (new wspr menber) spotting me at 1mW with -4dB SNR. I increased my weinschel attenuator to 23dB =50µWatt.
And yes this morning I got 1 spot with-13dB SNR so plenty room to go lower..
Indeed -13dB 304 km gives 6.08 Km/µWatt. 16dB (-29dB min) room so with 2.5µW it could be possible!
Congrats Peter, but pls provide us with details off your bigear.

2009-12-28 07:50 ON8DC 3.594055 -13 0 JO21be 0.001 DM3XRF JN39pi 304 131

After "fiddling around" with some difficulties, I have it running now. Before XMAS my SDR-IQ RX arrived from the U.S. (RFSpace company). Using the VAC(Virtual Audio Cable) software I got the AF fed into WSPR and it is running very fine now. RXwise only of course.
Anyone else is using the SDR-IQ here ??
GL es 73 de Christoph DF9CY

The 40m low power activity on the XMAS days were fantastic. I found it almost unbelievable, of what my little Softrock_RXTX6.1 is capable TXwise with the 450mW as well as RX wise. I have a high noise level from halogen light switching PSUs here otherwise receiving could be better. Despite my antenna - which is a full size dipole for 40m - is up only about 6m, my signal was heard down in VK7 and ZL. Thanks to all for participating to the activity.
73 de Christoph DF9CY

final results are listed down. intresting remark "best ear" is DK5AI with 4.47Km/µW 4.4Mi Km/W. If I take into acount that his SNR is -21dB and the best could be -29dB He can theoreticly spot me with 16µW
Same excercise PA0HCK could recieve me in theory with 13µW finally ON7AN with 10µW.

2009-12-26 13:20 ON8DC 3.594069 -25 0 JO21be 0.001 ON7AN JO20ek 85 168
2009-12-26 13:00 ON8DC 3.594069 -24 0 JO21be 0.001 ON7AN JO20ek 85 168
2009-12-26 12:40 ON8DC 3.594069 -28 0 JO21be 0.001 ON7AN JO20ek 85 168
2009-12-26 12:32 ON8DC 7.040053 -25 0 JO21be 0.001 DK3SML JN49sf 443 117
2009-12-26 12:32 ON8DC 7.040055 -29 0 JO21be 0.001 G4ENZ IO81vv 445 283
2009-12-26 12:00 ON8DC 3.594069 -22 -1 JO21be 0.001 ON7AN JO20ek 85 168
2009-12-26 08:00 ON8DC 3.594074 -21 0 JO21be 0.001 DL0TUH JO43xl 471 55
2009-12-26 02:20 ON8DC 3.594077 -28 0 JO21be 0.001 DL0TUH JO43xl 471 55
2009-12-26 01:20 ON8DC 3.594073 -21 0 JO21be 0.001 DL0TUH JO43xl 471 55

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