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.

31.12.17 Very pleased that within 24h of starting tests on 6m I got a spot 855km away in Copenhagen with just 100mW

I test WSPR-X software.
It do not decode! I see message box:
"At line 34 of file wsprd.f90 file: "Files\wsprx\save\171230_1154.c2"
Traceback: not avaiable, compile with -ftrace=frame or -ftrace=full Fortran runtime error: ////////// "
What is It?

Hi Guys,

I'm starting to run WSPR 2 days ago on 40m only with 5w into an inverted V from JN38AS.

All the reports are welcome. See on for the contact info.

73's & HNY de F4ESV Wil

I finished the construction of my loop this weekend, made the connections to the receiver yesterday afternoon and started listening to 474.200khz. I was pleasantly surprised this morning when I woke up, I received PA0A in the night, my first station on 630m. the antenna is oriented in a north-south direction. Excellent experience for me. 73 and happy new year 2018!

Timestamp Call MHz SNR Drift Pwr Grid Reporter RGrid km az
2017-12-27 21:34 PA0A 0.475626 -30 0 JO33de 2 FR5DH LG78pw 9503 135
2017-12-27 21:26 PA0A 0.475626 -26 0 JO33de 2 FR5DH LG78pw 9503 135


i turn on my wspr station this night on 40M. You can send report via email :

Best 73 from F4CVQ

2W in a vertical antenna (2m from the ground.

For me activity and fun is still there and even better on 630m !!
To date i heard 65 NA stations on 160m and 10 on 630m (On Dec-25-2016, 61 NA on 160 and 6 on 630).
I hope your satisfaction goes in the same way you are rxing or txing !!
GL all for the rest of the season, great fun to come...
73, Patrick

Is there a way to correct reception reports in the data base? My fumble fingers showed quite a few spots last evening from my Yacht off the southern coast of Chile when it was in fact it was a grid square fantasy moored securely in downtown Tucson AZ. Cheers and 73, Jim

Nice wspr last night with my bitx40 did a great job of reaching out under 2w!

What happens to the decoding signal, with QSB?
The essence of the experiment:
Turn on the receiver in the given time and look at the WSPR decoding.
1) Receive for 1:30, 1:00 (full signal around 1:50). Decoded! :woohoo:
2) Receive for 0:30. Does not decode.
3) Receive within 1 minute, shifted relative to the start signal for 30 seconds, i.e. from 0:30 to 1:30. Decoded!
In the picture a visible signal (1:50; abbreviated: 1:30, 1:00, 0:30; 1:00 with an offset).
The result:

This last week something odd happened.

WSPRNET would previously (I think this is how it works) add the last two digits on my locator square if known in it's internal database
on my transmissions. ***( I only transmit, and with a bunch of G0UPL ULtimate TX's).***

It no longer seems to be doing this.

I am in JO01MI, it now only reports JO01.

The set up here is a pair of G0UPL U2 rigs, and a U3 rig, all with their own GPS (no single point of failure) and nothing whatsoever
has been altered with then for about 4 years.

We planed to put the HAB in the air !
I will launch another stratosphäre ballon similar to STELLA4.
The payload will have 2 Cameras on Board.
Also it will have the new designed WSPR PCB on board that will transmit at 30m.
You can track the transmission on CW at 10.139,950MHz, JT9 at 10.140,450MHz and WSPR at 10.140,100MHz.
Here is the link from the QRP Labs livetracking website that will be available short before the start :

Testing the code for an Arduino driven GPS timed beacon.

10mw from an SI5351, and into a QRP-Labs 20m Low pass filter.

The GPS syncs the time, figures out the maidenhead locator, and transmits on a pre-defined schedule -

USB powered via an Arduino nano.

I test WSPR beacon on 10M band. Beacon on Si5351+Arduino+BS170 AMP radiate only 10 mW. My antenna is wire 10 m long, 4 m upper the ground. Beacon is working two weeks continiously. Some spots:
2017-12-12 17:28 R2AJA 28.126060 -27 -1 KO85xt 0.01 PG0DX/1 JO33ce 2052 275
2017-12-12 17:04 R2AJA 28.126049 -26 0 KO85xt 0.01 OZ7IT JO65df 1608 278
2017-12-08 12:38 R2AJA 28.126028 -11 -3 KO85xt 0.01 OZ1FJB JO55si 1651 279