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.

As you will see by the database VK3OT/SIX and VK5PJ have ben conducting experiments on the 6M band over 450 km from Adelaide PF95 and Hamilton QF12.
For those who dont know the path is not line of sight. it is over flat ground desert for hundreds of KM with a slight rise at each end. I am 800 feet AMSL and VK5PJ about 250 feet.
He is running 1 watt to a 9 el M2 yagi. I am listening on an identical antenna (from same batch in 1989) and using a TS690SAT as VK3OT and an FTV1000/FT1000MP with 2ppm osc as VK3SIX.

In addition to my MEPT on 10.140073MHz which has 8 Unit, QRSS, Hell and WSPR modulation and a Power Out of 37mW. I have been running a DDS controlled MEPT which can virtually go anywhere, 1.8 to 50MHz.

Currently this TX is just below the 28MHz WSPR Window on 28.125995MHz, Power Out 300mW. It uses 5 Unit modulation to produce QRSS, Hell and WSPR. Even the better commercial rigs can easily be almost 100Hz out on the dial reading, consequently I am decoded by some stations as I appear in their passband and missed by others who are out in the other direction.

Several times in the last couple of weeks, when I have left WSPR running overnight, it has shut itself down during the night. The computer is still running, Spectran is still running, but WSPR has stopped.

I'm wondering if anyone else has noticed this happening.


As I had hoped, the 200HZ filter on the K3 seems to offer better WSPR decodes. I seem to be copying the very weakest stations much better, and have had decodes at the -30 level since installing. Perhaps it's premature - it's only been in a few hours - but it certainly seems to be a lot sharper than my 400HZ filter dialed down to 200HZ, and that is a plus for WSPR. Hopefully, some QRPP signals will tell the tale over the next few days.



I recently installed the DX Engineering vertical, a 43 ft, rather shiny piece of Aluminum on the ground in the backyard. I have 24 buried radials from 20 to 60 feet long. I am receiving much better on WSPR, and am consistently getting excellent multiple reports with my preferred 500mW of power.

I have also ordered the 200 Hz 5-pole filter for the K3, and this will be my preferred WSPR filter set. I am hoping the very even rolloff of a standard WSPR BW filter will help me copy a lot more stations.



Hi all, monitoring here in Bristol just noticed my clock was out, have adjusted and as at 11:04 UTC 04/05 should be spot on... antenna is nothing flash just a few bits of wire hanging off of a 5m length of RG213. G call is hopefully in the post...
David - ZL1BT/G

Testing 160 path Edmonton AB - Dartmouth NS
-consistent path from 0300-0900z
-Avg SNR -24db

When I`m active on 10mb or 15mb I can note more drift on WSPR transmissions by many stations, like this:

I couldn't find an appropriate transistor to control the PTT on the FT-920 from the serial port and I stumbled on the rigcltd pages on the Internet.

rigstld is a Linux rig control daemon and so I have spent a few days working out where to add the code into
It's quite straightforward, only about 8 new lines, and now I have the PTT controlled through the CAT port without any messing around with a soldering iron(!)

However, occasionally I am getting this error:

Expression '*odev = open( odevName, flags )' failed in 'src/hostapi/oss/pa_unix_oss.c', line: 821
Expression 'OpenDevices( idevName, odevName, &idev, &odev )' failed in 'src/hostapi/oss/pa_unix_oss.c', line: 864
Expression 'PaOssStream_Initialize( stream, inputParameters, outputParameters, streamCallback, userData, streamFlags, ossHostApi )' failed in 'src/hostapi/oss/pa_unix_oss.c', line: 1239
An error occured while using the portaudio stream
Error number: -9985
Error message: Device unavailable

but I am not sure if this is related to the CAT control I have added or a problem with the sound install on my system.

One of the many problems getting wspr and wsjt to compile on a AMD64 machine has been the need to use the G95 fortran compiler.
In the last month I've found on a .deb for AMD64.
I can now get wspr6 to compile, but still difficulties with wsjt7 and wspr.
The current OS here is Ubuntu 9.04 AMD64 which is due to be released sometime around 24/04/09.
The problems I'm encountering compiling wsjt7 and wspr are building the portaudio modules.

Really I am very impressed by the wspr. I am active of cw to 100 % and the truth is that I hallucinate when I see that month they are listening in vk with only 100mw with my dipole.
And everything with my old man FT817ND and one interface USB rig expert standard.
What I cannot fit still it is my newly FT950 not if it is for the DSP that is not a good ally for the use in wspr.

I've generated a short video of using VOAAREA to predict received signal levels for my 200 mW WSPR transmissions. Comparing spots from the WSPR database to the predictions has been very interesting and show a pretty good correlation.

You can find a writeup of my results and a link to the video on my personal blog at:

WSPR & Propagation Predictions

Feedback appreciated!

In the quest for a simple WSPR homebrew transmitter, I had to step through the process of generating WSPR without a computer.

My on-the-air transmission of last night (2009-04-06) has proven that it is possible. Given that a WSPR beacon emits a cyclic time-invariant signal, its sound can be pre-recorded and re-played endlessly with a simple MP3 player.