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.

With 37db and an self-made ofcd about length: 78m I have had the confirmation of receipt on 40m band of VK6ZRY (13577 km)end VK6BN (13593 km).
Not badly as I begin.
73 Massimo.

I am fairly new to wspr, I have been running the software periodically for a couple of weeks, and have started pondering how to relate this information to "real world" scenarios. I have come across a figure of -10dB SNR as a minimum usable signal level to decode PSK31 transmissions. If I look at most the spots where I have been received, I am usually well into the "minus teens or twenties". Has anybody looked at whether there is a predictable correlation between changes in transmit power and changes in received SNR? I transmit at 37dBM (5W). If I were to double my transmit power (3dB increase), would there be a predictable amount of change in SNR at the stations that receive me, or are there too many factors that affect my receive strength at any given station. Ultimately, I would like to see if we could use this wspr data to predict, for example, how much power should I expect to need to use to get a reliable PSK31 signal into Germany, from North Carolina, on 40m with enough strength to be received.

Today I installed WSPR 2.0 to experiment with QRP. I think this will be my favorite...
After some "technical problems" it worked properly with 5 watts even on the 80m Band (I have no appropriate
antenna for 80m). Well, today's goal was just to become familiar with WSPR. It is generic and "feels good".
I am positively surprised of that radiowave propagation and I will fine tune the system asap.

hello, to all i'm a newbie of wspr from italy. i trasmit from jn56mj with 5 watt in a long wire antenna beam est/west .next fays i will operative on 6 and 2 meter with an vertical antenna for 6 meter and 17 el. yagi for 2 meter. stay tuned !

Well, my 80m Carolina Windom seems to work well with 0.5w so thought I'd use that for a bit of CW practice. For WSPR today just using 0.5w into a directly attached Miracle antenna. Shack noise already rather apparent.

This is my little configuration for WSPR mode receiption: YAESU FRG-100 and homebrewed 70cm long active rod antenna in middle of the house in basement floor.

I am interested in comments of other members as to minimum practical transmit power for 160 WSPR. Thanks, Tom N8TL

Coolest thing since sliced bread!

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