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.

I am very much developing an interest in digital modes. I have enjoyed playing with JT65 although it is a bit tedious and time consuming. It is very good at developing patience. I like the WSPR stuff because it gives me a handle on propagation. 73 and good luck


I'm up and running 24/7 on 6m, running 5w to a PAR Omniangle at about 10m. There have been a couple openings over the past few days, but the spots don't really reflect that.

I'm hoping that a few more US stations will be able to get up and running on a full-time basis.

73 - Al, K2ZN

Yesterday I fired up again the WSPR multiband beacon after changing the DDS AD9851 with a SI5351a OCXO.

The beacon is an Ultimate 3 with the OCXO mod to have a better stability.

Programmed through an Arduino Mega as ISP the firmware 3.08 to use the OCXO on the 328p.

Spent hours to calibrate the temperature of the oven and now I am very happy with it.

During the test the frequency stays stable varing 0,01 Hz up and down @ 10.140.265 after 1 hour of use.

The measured temperature in the OCXO oven chamber is around 47 degrees celsius.

So much for hoping to run my WSPR beacon 24/7 365 days a year!

I was trying to assist in tracking one of the project space balloons, which sent JT9 data on 30m, and with my beacon going, I wouldn't be able to hear it. The balloon, launched from Melbourne, is now some way to the North East of New Zealand, and no longer audible here. Next stop for it probably South America if it stays inflated!

My WSPR beacon is now enabled and active again.

73 - Rob VK2GOM

After myriad unsuccessful attempts to get my Softrock Ensemble to receive properly (despite successful transmissions), I decided to designate my IC-746 for WSPR and other modes. Easy cabling and handshake with Signalink USB brought quick joy.

I do notice that my receive noise sometimes jumps to 20db for a short time, and then returns to its sweet spot of -25db. Not sure why.

I'm a retired Broadcast Television Engineer / Ham, who has been experimenting with PSK31, JT65, and APRS for a while. I just recently was given an Ultimate3S kit by a friend, and have commenced testing WSPR with 250mW on 20m. I've been impressed so far with the propagation, given the low power, and the fact that I am only using a 20m vertical mounted on a tripod INSIDE my house.

This can only get better.

I've seen the banding phenomenon before - but was quite surprised to see it with an added effect similar to the Scottish Flag. I do live in close proximity to an OTHR [over the horizon radar] receiving station, with the transmitter being 100km away. PS: I started a new topic as this seems to be the only way to add an attachment.

So I've let the FT-817 run Tx for a day. The last Rx I got was 0048Z with a local station (JH1HRJ) after that the band seemed dead. I get VK4TVL around 0900Z but on this day I was not able to hear him/her.

The attached file shows the waterfall I saw when I checked the laptop running WSPR-X. There is very pronounced "banding". On "normal" days everything will just be covered with noise (i.e. the bands aren't perceivable).

I am trying to write a false spot detector/suppressor for my WSPR World Watch Android app.

Here is a set of obviously bad decodes :- (See attached png.)

Just downloaded the sources from v1.6.1 and compiled this new experimental version.
Works excelent here with my Ft-817ND interfaced with mircoHAM USBIII at Ubuntu Vivid on a 64Bit machine. I was able to change for ham radio purposes completely to Linux now.
Thank you very much Joe and all the other developers who made this possible.

What was the name of that song ? ---- I think it was by "The Drifters" !

The latest version ( decodes both wspr2 and wspr15 files. It will auto detect the mode with a .c2 file. To decode a 15-minute .wav file, use the -m option. I have tested this on exactly 3 cases, so I'd appreciate feedback from anyone who tries the wspr15 mode.

Steve, k9an

For those who are using the k9an-wsprd decoder, I'm pleased to report that Joe Taylor (K1JT), creator of the WSJT and WSPR programs, has made some changes to the code which resulted in a huge speedup of the decoder. Execution times are now 4 to 8 times faster than before, depending on the noise and interference characteristics. Joe has built the new decoder into an experimental version of another of his programs, WSJT-X, and it's likely that this program will be available for WSPR use fairly soon.

Hello all wspr Op.

Thanks to much work done by people programming the RPi it is possible to get started
with WSPR in a very reasonable and inexpensive way.

Just running the RPi as a tx with its 10 mw output via a filter I have received lots of spots out to a radius of 1500 Km.

QRP MEPT on 20m, 10 minutes frames, Ultimate2 with GPS and 2.07 firmware.
Tx'ing WSPR on 14097130, then DFCW on 14000830 (followed by Hell on 14064300).
Start no earlier than 0700 UTC until no earlier than 1000 UTC.
Daniele IZ5WWB

Can anyone point me in the right direction please?

I am looking to develop, if possible, a WSPR station for use whilst operating /MM on a sailboat on an Atlantic crossing event. The potentially very low power consumption of WSPR lends itself to meet the constraints we need to apply. Specifically the event requires that no engine power is used for the whole crossing, which could be many weeks and is weather dependent, so power consumption is a critical issue.

Tnx to VK2IJC's clear instructions I got the Pi-2 whispering!
The downloading of the WSPR files and the compiling were done from the Command Line Interface.
I could not start WSPR from the CLI. When I went to the GUI, and then to the Terminal, the WSPR-program started fine.
Tnx Indrajit !

73, Robert