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.

The Falkland Islands (IOTA SA-002) is not a particularly long distance from Johannesburg, but it is my first contact with my new/old Flex-1500 SDR after settling all the arguments in the laptop's brain between the various softwares and VACs and VSPs and goodness knows what else:

2015-06-08 05:12 VP8ALJ 3.594094 -19 0 GD18bh 10 ZR6LU KG43 7517 105

I set up my 200mw Ultimate 3S outside this morning, with a 20m hamstick and wire radials. Less than an hour out I am spotted by TWO Australian stations... 7700 miles ( 12,400 KM ) ... I am truly hooked by this mode :-)


Hello All,

Following Joe's ( K1JT ) post about WSPR Mode in WSJT-X (, I've made available the packages (in PPA form) to install WSJT-X ( includes the new WSPR and C++ decoder ) and kvasd-installer to install the KVASD Binary used by WSJT-X.

As you may have heard, a number of us have been WSPRing from within program WSJT-X in recent weeks. Up to now you could do this only if you built the program yourself, from source code. Many people have been asking when a version of WSJT-X including WSPR might be made more widely available, so here's an update.

2 spots for a great day:

- first on 630m and later in the season
2015-06-02 03:00 WG2XJM 0.475775 -28 0 EN91wr 5 F59706 JN07th 6206 54
tnx Eric (NO3M- part 5 license)

- then T2RG (Bob-VK2RG)from Tuvalu rare dxcc on wspr
2015-06-02 12:26 T2RG 21.096175 -24 0 RI91 5 F59706 JN07th 15694 357
tnx Bob for the first effective dxped with wspr

73, Patrick, F59706


Summer is almost here and me and the usual suspects are back on the 'impossible' band. If anyone wish to take part, and need testing, want me to change frequency,etc, please drop me a mail(djchrismarc at gmail).

I am using omni directional horizontal antenna and i will try to be on the air almost 24/7(no tx when away, sorry).

Here my waterfall, updated every 60 seconds:

Use the F5 button to your heart content.

Here Brian's (G0MJI):

Yesterday I blogged about attempting to reduce drift by encasing the components of the Si5351A synth board with foam. In the long run, this approach had a discernible, yet minimal benefit.

Today I took the second approach I wished to examine. I took a nickel plated brass threaded spacer and filed a flat edge on it. Then I removed the top insulation from the synth board and attached the spacer, with epoxy, to the 27 MHz crystal on the synth board. I've attached a picture showing the modification. The white material on the board is residual latex caulk from the previous test.

I really like my Ultimate3S beacon... but the drift rate has been a bit of a bother. It has been hovering at -3 and -4 ever since I built it. I mounted my WSPR transmitter in a plastic case, and I thought it would be stable after running for an hour or so. It seems that the oscillator gets calibrated after a WSPR transmission, when it has been warmed up a little by the BS170 PA FET's. Then it cools a little while the FET's are off. Then it warms up again when the next WSPR transmission occurs.

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" !