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.

Hi all,
I'm testing Raspberry Pi WSPR Transmitter now as follows;
My additional task is improving the FET Linear Amplifier.

ja9mat Hidehiko.

Over two years ago, we installed a 30m QRSS transmitter in our shack and it’s been running almost continually since then. The site is very close to the sea and the aerial is a resonant monoband dipole oriented roughly north-south and at about 40ft AGL.

As of the 8th July 2013, G0PKT is running the new 2.02k firmware in a Hans Summers “Ultimate 2” transmitter and so as well as sending QRSS, we’re now running a WSPR cycle every ten minutes.

Testing WSPR Beacon with external 10 MHz GPS DO based on W3PM Arduino Mega 2560 & DDS60 WSPR/QRSS Signal Source v3.2, 50 mw into 203 foot Random Wire Antenna, 5' high.

73, Javier

This project provides a simple means of generating an audio WSPR signal using either an Arduino Nano or Arduino Uno to drive a SSB transmitter for mobile or portable WSPR beaconing. Automatic compound callsign and GPS derived 6 digit locator encoding are included.

Additional information is at:

73, Gene

le bonjour en ce samedi 29 juin 2013

Am I the only person who found the article in June 2013 Radcom by Andy Talbot strange. If I didn't know better it might have come over that some people have an agenda against free experimentation.

The article made certain assumptions about the (implied) misunderstanding (we are wearing the wrong trousers apparently) of operators on bands above HF. What if the operators already knew and understood the issues raised, but wished to experiment regardless?

When I obtained my license it was with the understanding that we would use it for experimental purposes.

Yest I had tried on 21.09460 @ 15.23 UTC with 5W power. I had copied two stations DO1WWW.
But I couldnt see the spot in map when I checked online.

Received the Ultimate2 QRSS kit from Hans on Monday.
Pieced it together and hooked it up to the 30m dipole which is mounted under my roof @ 8m height.
Need to learn the software capabilities a bit, the GPS which I hooked-up is not communicating with the board.
Need to look into that.
At least some OM are picking up the 150mW WSPR signal.
Will shut it down after an hour or so, must first lookinto spectral purity & stability.

The Softrocks, and many other Si570 based designs are a bit temperature dependent.
I am trying to tx on 10140277 Hz with my portable rig. To check the frequency I will just read the frequency reported back to me..
As you all know the result is not very clear. One stn will tell I am on 289 Hz and another is telling me I am on 258 Hz.
I am all alone in the woods with my little softrock and on frequency unknown!

What I have done to resolve this may be of help to some of my dear wspring friends as well, so that is why this is written.


I have turned on my WSPR beacon on 80m with a little more than 1W into an OCF Dipole not very high above ground.
I know that's not the best time for low-band DX but I just had enough spare time to finish the PA which was sitting in a box for many months...
Hope to have reports despite condx.

Yan - XV4Y.

Wow CN8LI @ 1320 +10dB. Even better at 1336 and 1348 +12db.

I've built a new Ultimate 2 kit from Hans G0UPL. Trying out first WSPR mode transmissions on 14097115. 150 mW into a G0FAH dipole up 40'. Hope to be spotted.


The source code for firmware 1.12 is available for download.
The new feature in this release is the ability to run the beacon in "cycling mode" where it goes through the bands (frequencies) you selected.
Several sets of bands are programmable and can be selected at startup time.

Two radios transmitting simultaneously, one exciting a 'reference' antenna and another a test antenna using two different freqs to differentiate the results at the spotting stations.

Ref Ant - A dipole center at about 30', dipole is horizontal
Test Ant - An EH Antenna, center line about 25 feet, EH antenna oriented vertically.

Quick webpage with more info:

(1) The EH Antenna is fed via a coupling loop (Link coupled) near the EH "Tuning coil" and is not directly connected as normally depicted on most websites.
(2) The low frequency radio was on the EH antenna, the higher freq radio was on the dipole antenna
Update 6-11-2013: More plots of SNR of the Dipole vs the EH Antenna at various stations:
(1) Plot of 40m WSPR snr at K9AN ........ (2) Plot of 40m WSPR snr at W4DJW
(3) Plot of 40m WSPR snr at WB2EEE .. (4) Plot of 40m WSPR snr at F1VMV
(5) Plot of 40m WSPR snr at K7TSW ..... (6) Plot of 40m WSPR snr at VE6PDQ

This is the really wild one; notice how the EH still holds the path whereas the dipole has died away:
(7) Plot of 40m WSPR snr at AK4UR 1691 km at 64 deg.

I am running a GPS-disciplined Softrocks RXTX from Singapore on 20 meters at 14.0975. Details of the GPS reference modification are here: