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. now fine. The trick: add your user to the group "dialout". Antenna is still the selfmade "Springy" indoor antenna as mentioned before...

We are very excited to announce the RFzero - a multipurpose Arduino RF platform that can do WSPR from 100 kHz to 1 GHz in a cost effective way and at the same time with a responsible RF spectrum and stability performance.

For more information please visit

You can use one of the dozen example programs or tweak them to fit your specific need for WSPR but also for CW, FT8, JT9 or PI4. Soon we will also have an example program for a QO-100 dual LO solution.

Now running DX Commander. Still working on adding 17M element and need to tune up 20 meters. 40, 15 and 30 are running well.

I built an endfeeded halfwave mono-band indoor antenna by uing a childrens toy from the 70ths: springy, the stair walking spring (picture). TRX is a qcx kit from Hans G0UPL, 5W. Got Iceland and Gran Canaria tonight :-D

Hope to see you, 73 de Tommes DD1TOM

Hello WSPR friends,

we have some standard filters that are available on database spot query function such as:

- Band
* dropdown fields = LF, MF, 160m, 80m, 60m, 40m, 30m, 20m, 17m, 15m, 12m, 10m, 6m, 4m, 2m, 70cm, 23cm

- Count
* input field integer values from 1 to 1000

- Call
* input field alphanumeric

- Reporter
* input field alphanumeric

- In Last
* dropdown fields = Hour, 12 Hours, 24 Hours, Week, Two Weeks

Hi all.
I just released my latest low power, low cost WSPR transmitter.
This one has a built in GPS with built in antenna and is optimized for low current consumption and weight.
It can be powered from a single LiPo or from USB.
It cost only 39$ and operate on a single band as set with a low pass filter (sold separately).
Any band from 137kHz to 70 MHz
More info here :

In the past week I've been using the new loop by ciro.The loop is on the lawn surrounded on the south by trees and houses to the west. The ear is at 1:3 to 1 using around 15 watts on different bands .



After much procrastination, I finally got my TAPR 30m tx connected to an antenna yesterday.

I didn't really expect much from 200mW going through an MFJ 945 match, a 9:1 unun and about 16m of wire slung off a 2nd floor balcony and temporarily lashed to an unsuspecting tree.

And roughly 12 hours later, here I am with hundreds of spots. Most are in Europe, but the best DX was a couple of VE's at over 8000km. WSPR (and TAPR): thank you. This is cool!

Doing an overnight test on 474Khz. Running an Hans Summer U3 at about 0.5 watts into a long wire (approx 40M) to get a base line before i make improvements. Estimated output is 1mW EIRP. Its probably a little lower though.

Just finished my first test of my RPi model 2B with it's attached TAPR QRPi Hat, employing a BPF, FET amplfier and LPF. Tx signal strength was ~33dBm, operating for 24 hours on 20M 14.0971MHz. Reception spots are logged from as far west as California and many inbetween. No EU spots that I can see.

Thanks all and Thanks to JT for the programand TAPR for the Hat.

I rented some rural accommodation over the weekend (9/10 March) to get away from the city noise for the RSGB Commonwealth CW contest. After the contest ended (Sunday 10:00z) I ran WSPR overnight until Monday morning. The 20-30 dB reduction in noise made a huge difference. I usually struggle to decode any NA stations on 40M long path from my city QTH but in this quiet location I could decode many NA long path stations until 3 hours after sunrise. I was using a full size quarter wave vertical (2 x elevated radials) on 80M and a multi-band dipole (20mh) for 40M and 20M.

At first I thought it is a joke, that a bare RasPi should work as a WSPR transmitter.
OK, I quickly burned an image, tuned my matching network to 160m, soldered a low pass filter and BANG! I couldn't stop stunning at the results.

This really carried me away and I also started tests on 40m with the same antenna. Here on 40m I could bridge the Atlantic, but comparing results 160m still seems to be more interesting.

I'll try to build a small PA with a BS170 and I'm already curious about the impact on 160m.

Hello everyone, I am finally getting in to WSPR. I tried it over a year ago, but did not quite understand it. Now that I understand it, I'm going in!

Here goes nothing!

Just finished this new kit. Maybe can be interesting for experimenters.
Check my website for more info