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.

An open Facebook group devoted to amateur radio operators who utilize the WSPR mode and anyone interested in very low powered, narrowband radio transmission. If you have a Facebook account check it out.

I think the good thing about the wspr project is that it highlights the importance of energy per bit, especially over an ionospheric path. Keep shouting, no matter how weak your voice, and you will be heard eventually, so long as you keep going long enough. Metaphor for life?

WSPA (whisper)

I have been working Whisper the last couple of evenings on 30 meters but with the high winds tonight and the same forecast tomorrow I Have lowered my mast right down, My long wire is mostly laid on the grass in the field behind my QTH, What I find amazing is that I can still get propagation contacts into the USA and Europe on 5w

The long wire is plastic coated but even so it is laid on the ground, WOW.
Just thought I would share this with you all

Mick 2e1glt

My antenna tuner arrived and I hooked it up to my 40/20m shortened dipole.
With my homebrew transceiver I now started getting reception reports on 30m.
So far about 7 stations, as far away as 2000kms.
It's always exciting when a piece of homebrew equipment actually works!

My experience of using wspr to control ft897 through usb port using Prolific usb->9 pin rs232 (XP and wspr 2.21 v 2286):

Doesn't work unless you force the pc to assign com1 (perhaps up to com3 but not com4 and above)

ctrl panel->system->hardware->device manager->ports->port settings->advanced and set the com port to com1.

Not a fluke 'cos same on two pc's

Tonight at 2054Z there was suddenly 35 Hz spread on one incoming
WSPR-signal. It returned at 2104Z starting with 30 Hz spread and
declining to 20 Hz at the end of the 2 minute period. Immediately
I checked the magnetogram at SGO Sodankyla (Northern Finland):

and the spectrum widening correlated with the 60 nanoTesla spike in
the Y-component of the Earth Magnetic Field starting just before 21Z.

Hello to all
I am using WSPR 2.0 under Win XP SP3 OS and browser in use is a Firefox.
Im not able to find me in map. Upload spots is ON.
The problem is new. What does is mean this situation?
Thanks for advice to all.
73! Ladislav OK1UNL

The N3ZI DDS kit was built some time ago, and I used it for alignment of the WSPR Transceiver. I couldn't get the notch filter adjusted for the correct peak and null. With Christmas and a vacation down south, I set it aside for a while.

Sat, 2011/01/29 - 18:21


I am testing a homemade QRPp transceiver
in EA4RCT club station

I will be transmitting next days at 3584.1 kHz
with WSPR v211 200mVpp@50ohm 100uW -10dBm

The WSPR is configured in IQ mode and with a "0dBm" power.

I will be happy to receive QSL at
ea3ghs at gmail dot com

eduardo ea3ghs/4

Everyone here knows that WSPR is open source software. The full source code is licensed under the GNU General Public License (GPL), and is available to anyone, under the conditions of that license, at

A number of people have contributed to the development of WSPR. We communicate with each other by means of an email reflector hosted at the above URL.

At least a 3 months break with WSPR at the OH1ZAA-location. In the meantime
we have been following it from the side at OH3MHA (mainly active on 7 MHz).

Couple of days ago decided to change setup which was working for a year already - ZetaSDR+Rocky+WSPR 1.0. Changed to WSPR ver 2.11. The start was not straightforward, finding the frequency offset took several hours and the result is more experimental than calculated. Then tested phase corrections. If somebody intend to use such setup my freq shift with clock oscillator at 14.31818 Mhz is 12980, RX I/Q not inverted and all phase corrections off (I found this option best already but will make more tests).

AL4S and N6SPP/KL7 will be QRV @ KL7AA attempting EME starting at 10:30pm local.

First time out in three years with the gear. Also will do some BARTG RTTY this weekend.

Is anyone interested in scheduled testing of SSB communiation paths on 6,2, and 70cm? You can email me directly at - 73's es gud DX! Tom EM70vn

Increasing numbers of my spot reports do not upload with "attempted access to WSPRnet timed out" messages.
Is the server capacity overloaded? Should we manually upload our stored spot reports to the server to transfer the missed ones?

I have just noticed a typo error in my locator should read IO91UO not IO91OU. I have updated details today.


I had some extra time off over the holidays, and although the WX has been cool (-20 oC -ish) the thought that it would be nice to have something for 80m wouldn't leave my mind. On the other hand, midwinter isn't the time to be doing anything large or elaborate outside. I noticed an article in an old copy of TCA describing a dipole reduced in size by folding it into a square. Not a loop; the tips do not connect. For 80m, it's only 10m on a side, and I have a couple of 15m spruce trees in the side yard - directly beside the power line :(.

Just installed the frequency-hopping version of WSPR last night, and left it running on recieve-only. First indications are good, and I'm picking up signals from 80m (hello G4SPE!) to 15m (hello UA3ARC!).

I'm running an inverted L for an antenna at the moment along with an LDG Z100Plus ATU, so until I build some way of triggering the ATU from the machine running WSPR, I'll be sticking to transmitting on a single band for now.