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.

John K3KQV wrote this night a new ligne to the historical datas of the record distance. Well done with 100 mw !!

2015-04-11 02:26 K3KQV 1.838076 -25 0 FN00 0.1 F59706 JN07th 6214 54

2015-02-19 06:14 W3TIM 1.838108 -26 0 FM18cl 0.1 G8DYK IO85te 5719 45
2015-02-17 07:12 W3TIM 1.838107 -25 0 FM18cl 0.2 F59706 JN07th 6260 53
2014-12-08 02:44 W1FVB 1.838014 -27 0 FN44ej 0.2 G8HUH IO81mg 4992 56
2013-10-09 02:34 W1FVB 1.838027 -26 0 FN44ej 0.5 F59706 JN07th 5467 59

A few users have recently posted questions about timeout problems when reporting "spots" to the server.

I have been working a little on fixing some of the problems with WSPR-X lately. As part of that effort, I enabled some debugging statements. One of them saves the processing time returned by the server when (my) "spots" are reported. This is the time reports that it used to just store the "spot" info in it's database, the network transit time is NOT included. I thought it would be helpful to share that info here.

I love WSPR.

what can be done to make this a contestable mode?

I am ready willing and able to help move this along.


A new record for me 16Mm, heard by VK2XN in Australia. Are some exceptional atmospheric conditions going on?

2015-04-10 16:06 M0WLH 14.097093 -23 -1 IO93ah 0.02 VK2XN QF59ar 16601 53

I have been slowly convincing a FT690R that WSPR is a good idea.
Having a 40Hz droop on your single is embarrassing to say the least. Upgrading the regulators supplying the main PLL is slowly helping and now down to less than 20Hz frequency drift, with receiving stations starting to decode my transmissions. One regulator to go!

Looking through my 20m activity and spotted this...

2015-04-09 20:44 G7EVW 14.097067 -20 0 IO94fv 0.005 VK2EFM QF56pn 16832 53

Well done G7EVW

...finished yesterday my 500mW WSPR PA incl. a 30m harmonic filter.
Started yesterday evening for 24h and got surprised to get reports from 5000km to 18000km.
Fun, fun, fun...

see pics on

This is the second time now this happened, 1 spot, but 6020Km away.

Can somebody confirm this happened?

As so far it's just 2 times on different dates.

2015-04-06 23:42 ON2HB 7.040078 -24 0 JO21oc 0.001 KX3DX FN20km 6020 292

I find this mind blowing, 1mW and such a distance, AMAZING!!!

It's quite a big jump from the ~2000Km I normally do.

But did it really happen?? Not some prank of somebody.

Bas - ON2HB

New to WSPR and trying to get my FT-840 working but I cannot seem to get the settings correct.... probably cause radio is not one of the Yaesu's on the drop down.......

oh well.... I will keep trying !!

2015-04-06 06:30 ZL4OL 3.594167 -24 0 RE54gg 5 F59706 JN07th 19150 286
2015-04-06 06:20 ZL4OL 3.594167 -20 0 RE54gg 5 F59706 JN07th 19150 286
2015-04-06 06:12 ZL4OL 3.594167 -21 0 RE54gg 5 F59706 JN07th 19150 286
I publish these spots of the morning to mark the situation. A real surprise because this is my first ZL on 80m WSPR.
Thanks to Mike.
73, Patrick, F59706

For several days, i have systematic an error msg when loading my spots to (see jpeg) and that every 10 minutes. Who has the same phenomenon? an idea of why??
73, Patrick, F59706

Today while monitoring the 10m band I noticed diagonal lines across the WSPR display (see attached screen grab). Could this be aircraft scatter?

I am located in FN41 between Boston and New York city, so I see a fair amount of domestic and international flights close by.

Sometimes 160m propagation has curious effects. That night I received on 160m the signal of John (K3KQV) from 02:10z to 05:30z with a kind of double peak. The first one at 04:12z (snr-5) is atypical, the second one at 05:20z (snr-9) is the usual peak framed by the beginning the twilight (TS) and the sunrise (SR).
I also wonder about the real power of John. An snr of -5 with 1w is a record. Unfortunately I did not find any email address to contact him :-(
Good luck to all, season soon closed ...
73, Patrick

Hi Folks:
I've seen this a couple times, and wonder if anyone else has.. At some point, The spectrum still scrolls, but shows nothing for hours, not even a base line, but the decoder is still decoding signals.. I pull the radio out of the mic jack on the computer, plug it back in, and the spectrum starts working.. That's all I have to do. Scratching my head.. de KB2MEN

VK3HZ and VK3XDK offers a very affordable eerie of modules to improve your radio accuracy and stability.
It allows to replace the internal clock reference of most of the market transceivers by a reference locked to a 10 MHz signal from a GPS or Rubidium clock.

If you like high stability for VHF WSPR, this will interests you.

Yan - XV4Y.

Operating from Maui, 40 meters, transmit mode only.
Antenna is ATAS 25 on second floor patio - see attached photo.
Aloha, 73, Jeff, AC7IJ

Hi all,

I was trying to find a way to get less then 5w out of the TS-590S.
But there is no setting to reduce it further, not even in the service menu.
Also I don't want to install a reducer as that is a kind of waste of energy.

But then I saw the DRV button and was wondering what it does.
It turns out that it outputs between 0,05 and 1mW depending on your power setting.
This power is delivered to the DRV output at the back of the transceiver when the DRV button is pushed a few seconds.
The normal power-output is then disabled.

2 Meter WSPR activity now comes to Texas - We will be running our WSPR stations Sundays and Mondays, so join us if you can in the East Texas (and general ArkLaTex) areas on 2 Meter WSPR!

Myself (KD6RF) in Gilmer Texas and Jim WB5WPA in the Allen (Dallas) Texas area, have been making the link on a regular basis - a 150 kM distance, all using low power and modest antennas. Last weekend, Christopher KF5KAX also joined us for some good "spots".

I am now up and running on WSPR permanently (I hope!) with my newly built Ultimate 3S on 30m. All built in an afternoon.

After a few initial hiccups regarding control of the firmware, I am now operational.

I initially mistakenly set the power too low, probably only around 50 or 70mW but was still making the trip into VK5. I have now used my Digital storage oscilloscope and a precision 50R load and set the power using that. I have set it as close as I can to 180mW (8.5V p-p into 50R), and labelled my transmissions as 23dBm (200mW) which is as close as the dBm scale allows.