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.

Time for the transmission:

Every day from 20 to 24 h GMT

Dias, frecuencias y modos de transmisión para el Periodo de Actividad en 500 kHz

Activity Period fron 1-4-2011 to 30-4 2011

Día Día de la semana Frecuencia (Dial) Modo Shift a portadora = 1500 Hz

I upgraded to 2E0VKG back in February, but other commitments have meant I've not had chance to get back into WSPR - until now.

Currently QRV on 40m, with 100mW (20dBm) into a long wire about 4 metres above ground. I'm controlling the output power by backing off the input audio, so not the most accurate way of doing things, but the FT-897 will only allow 5W as a minimum TX power.

Things look to be working okay, anyhow, as I've been received by W2OL and W3GXT, both in the US, and LA9JO in Norway.

I am quite excited by the latest WSPR result from my 136 kHz beacon! My 1 W audio amplifier (taken from a cheap PC speaker set) has been heard about 150 km away from my QTH! It happened during the day, so it's straight groundwave propagation. This is a stock standard TDA1517 based amplifier, which only a 4 to 50 Ohm impedance transformer attached to the output of one channel and a fan to keep it cool! The antenna used was about 13 metres of wire, slopping up, with the highest point being about 9 metres off the ground - nothing special in other words.

Who says LF is difficult?!

I am seeing signals on 30 meters that are out of time by as much as 20 seconds. You must be reasonably close to the time interval WSPR uses if you are to hear or be heard. If you can't maintain proper time you are just wasting spectrum and electricity. Dimension 4 is a free download which will mange keeping your computer time accurate. There are plenty of posts in the forums on setting it up and about NTP and timing issues.

Sorry folks I have been running with the wrong Locator showing,error pointed out by G3JKF, many thanks Ken for pointing it out.Now Correct at JO03DH

Testing with the IMAX2000

Online 08.03.2011 / 14 - 17 UTC

On 5 FEB 2011 I updated to WSPR2.20_r2283 to frequency hop receiving on 160 through 10 meters but had enabled transmitting only on 7 and 14 MHz where my 40 meter horizontal loop's SWR is under 1.5:1 without need for an antenna tuner.

On 6 MAR 2011 I cautiously enabled transmitting on 10, 12, and 15 meters where the SWR is less than 3:1, expecting no harm to the output transistors running a mere 5 watts. I was pleasantly surprised by spot reports comparable to others on those bands!

Antennas used in WSPR-experiments may have very differing structures. As such I do not think
that there is any specific recommendation. One uses often an existing antenna originally built for
completely a different purpose. Personally I started my HF-career for this particular location
30 years ago with log-yagis (3-element log-cells with a parasitic reflector and director) at various
heights. With WSPR I have used these on the “wrong frequencies”, that is: hardly ever on the
14 - 28 MHz bands those have been designed for. Since I have operated WSPR mainly on 7 MHz
and 10 MHz, the elements of those log-yagis have been electrically “too short”, thus specifically
yielding poor pattern and efficiency in transmit mode. While WSPR is generally not intended for
point-to-point traffic, the described behavior has been actually often more welcome than operation
on the initial design frequency of the antenna. Simulations with horizontally polarized 3-element
off-frequency log-cell structures show best field strength toward the horizon, but not in a controlled
or optimized way. Additional uncertainty about the pattern is introduced through usage of the feed
point matching arrangement on an off-design frequency. A big burden on such an arrangement is the
presence of numerous local sources of man-made interference these days.

So the chase for better SNR is imminent, preferably with a structure that scales well with changing
frequency. Such an antenna cannot be an isotropic, though that would be an ideal antenna for WSPR-
experiments when aiming for a minimum number of variables. Isotropic behavior is a theoretical
concept though, especially when taking into account ground reflection effects. However, anything
of the perfectly round pattern of a free space isotropic that (by changing radiator layout) can
be shaved off from specific azimuths or elevations, can be steered to add increased gain toward




I ran WSPR nonstop for a week (RX only) using the internal sound card of a Giada N3 Atom computer, and then switched to a 24-bit external sound card for another week of nonstop spotting. The results with the internal card were a worse, which is not surprising, but not by much. Click here for more details.

Not connected to internet where my rig is. Just decoded KC6KGE at 0752 UTC
db= -26, dT -1.3, Drift 0, Loc DM05 my Loc QE36.
73 de VK7HW

August sometime - to be confirmed. 2009 : Pencarrow at the mouth of Wellington Harbour - good fun was had, with a fullwave 160m dipole from the upper lighthouse all the way to sea level (the bottom end was IN the surf at high tide!) but the digital modes didn't get a chance due to interference caused.

This afternoon's transmissions at 14.097022 are going out at
one half milliwatt or 500 microwatts.

I set transmit power to 1 watt on my Bendix 263 and 30 db
attenuation on my R-9000. I then switched out the attenuators
and dropped audio gain to compensate. Finally I dropped audio
further, another 3 db or so.

Despite some cleaning i need to do, today i can settle down to run whisper for the whole day.
So, 10Mhz has been settled on.
I am using M3DXR (my other call) as i use that for QRP work and have set the TX at 500mW.
I am using the Kenwood TS480 with the MFJ962D connected to 20 metres of 450 ohm line with approx 40 metres of wire in a horizontal loop around the garden and bungalow.
So where will i get to and whom will i hear?
WX here is damp, not to cold and overcast. Wind very light to still.
73 and 501 de Rose

Today, I installed the WSPR program. The program works, but the CAT control is still minted with some problems.This is why, the program can´t communicate with the transceiver constantly automatically. I will solve this problem to morrow supported by DL1ZAV sysop of DL0NOT.
vy 73 de Jakob DO3HPR

K4TJM, some of your WSPR spots mistakenly show me transmitting on 1.8, 3.5, 21 and 28 MHz, like today 2/7 at 0824, 0926, 0946, 1046, 1146, and 2250. My station is set up to transmit only on 7 and 14 MHz for now where other stations have spotted me correctly. Please check your setup as you are uploading erroneous spot reports. Thanks! Carol KP4MD/W6

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