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 have.

Playing this evening with mixing white noise with the output of an IQ WSPR instance and viewing it on HDSDR. I adjusted the mix so that the decode was showing me at "-29 dB" and decoding reliably. The trace was just barely visible on the WSPR waterfall. Out of curiosity I brought up HDSDR and tuned the signal and the attached is what it looks like. An unexpectedly prominent spike poking up out of the noise. Using the MDS methodology and measuring in a 500 Hz bandwidth I found this signal to be +6 dB S+N/N as measured on an RMS voltmeter at the audio out terminals.

Cut it, put it up to tune it, thought it was too hot to do anything physical, so stuck WSPR on.

JH1GYE bidirectional. TYVM!

(That's on 20m, but on what is more or less untuned randomness I was pleased)

I unexpectedly hit a milestone today. I have been experimenting with the Ultimate3 WSPR kit that I built last week. I added attenuators to enable variable power WSPRing (an area of interest for me right now) and got this spot today:

2014-07-16 18:06 WR6J 14.097157 -28 0 CM97ag 0.005 DF2JP JO31hh 8968 30

I know others have managed 10 million miles/watt - but this was a milestone I had hoped to reach at some point. I have measured the output quite accurately with a scope and so I'm confident that it was 5mW. Antenna here is a vertical end fed half wave.

Just finished our 11 Band 5 Watts beacon,
the board is using GPS and is for stationary and mobile operation.
The DDS is running from 100kHz to 160 MHz.
The 5W PA has filters for 630m to 6m (11 bands) and has a connector
for a separate receiver (a mobile WSPR RX is our next project).
Configuration software supports Win, Linux, Mac and also Android on Smartphones.
All schematics and software are available for free for all Hams.
vy 73 Kurt, DJ0ABR (

First mobile WSPR!

Ultimate 2 w/T1 tuner helping out the 5/8wave Larsen 2m mag mount parked atop Schooley's Mountain. Nearly 6000km - not bad!
Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
2014-07-14 23:42 KQ2RP 14.097197 -28 0 FN20 0.1 ON7KO JO21ce 5949 50

For those who like to play with software... I have configured my wspr decoder so that can be used as a drop-in replacement for the wsprd decoder used by wspr-x. For those who are interested in using small, slower computers for wspr decoding, the k9an-wsprd program has a quick mode that limits the amount of time trying to decode very weak signals. It also has a "wideband" mode that will decode signals that are up to 50 Hz outside of the wspr sub-band. The code is available at

Just about done outfitting my Ultimate 2 beacon for portable ops. GPS module installed. GPS connector ported out the back of the case. 12V to 5V converter assembled. Hooked up with battery on the back deck to check for time/locator lock.

WSPR appears to have no support for the popular Yaesu FT-2000 transceiver. Am I missing something ?

I was very pleased this morning to see that I had been spotted twice overnight, by HB9TJM and CN8LI. In turn I was pleased to see on my screen that I had detected and reported CN8LI's signals at varying strengths this morning. It's very satisfying to know that you are being heard, and in turn providing feedback to another station on his signal. Considering my poor QRA and antenna location (I'm in a valley and my V2000 antenna is only 3 m high surrounded by buildings on 2 sides), this is good!

I have recently (loosely) translated Joe's wspr decoder algorithm to C. It is available at:

My version is not a direct translation, but it uses the same sequential decoding algorithm and performance seems to be comparable to wsprd, which is the decoder routine used by wspr-x. If you decide to try it out, I'd be interested in feedback.

73, Steve k9an

I tried twice with two different 10 M loops and had poor results. Both of these are indoor loops.

My first 10M loop was right above me around the ceiling of the shack, right up next to the drywall ceiling. I could not get the antenna to tune above 26mhz, I woudl cut it shorter and no thing would change... Very weird. I'm guessing the ceiling it self was messing with the antenna to the point of no return.

After being off air for a couple of years after my old Icom failed, I am back on the air. Started on WSPR about 12 hours ago.
My new rig is TS120S about 30 years old maybe more, but goes well. Am restricted to 20M by my antenna type, but thats fine it's always been the best band forever! Seems like I specialise in old gear, even the PC is about 10 years old and running XP.

Having played around with multiple power on successive WSPR transmissions, I am now transmitting two WSPR signals at different power levels simultaneously from the same transmitter. I have modified the WSPR code to encode two separate WSPR frames 100Hz apart at different amplitudes to create a single wav file that gets transmitted in the usual way. My tests overnight ran at 1W and 50mW. The idea is that one can't really make fair comparisons between signals transmitted at different times - since propagation and local noise levels vary minute by minute.

When I started toying with WSPR yesterday, I did not grasp the full number of uses WSPR would have in store me. Propagation is the obvious one, however testing different antennas and seeing the gain change shape and direction, seeing TX power levels and distance mapping, coax vs ladder Line loss/gain and having real data for differing radios TX and RX differences over time will really allow me (everyone) the ability to identify what works and whats just dreaming or guessing.

I'm using my FT-817ND at .5 watts into my main 20M vertical for this first test. I'll later construct a full wave loop antenna for 10M or 20M and assign this antenna and radio to WSPR. I'm also going to attempt to install/compile the WSPR software on my BeagleBone Black and also dedicate this set up to WSPR.

That is until I receive the Ultimate3 QRSS/WSPR kit in the mail and get that running, then I'll incorporate it into the WSPR set up..

I can see people's WSPR transmissions on my screen, I'll have to give it a bit and see if my TX was received as well.