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.

A smashing success with this little baby, within 15 minutes of installing the power connector it's up online and on air. With the VAC & CAT for this work this Flex1500 has real sex appeal. Mmmmm nice ! No old suit case style radios and sound card interface units, all software, all sleek and modern.

Today I stop my WebTRX and let run WSPR. I use WSPR before only from home for little tests but it is so interesting, that I will run it now longer. I let it run for first tests simultaneously on 15 and 20 Meter on a 2 Element Quad. I beam now 310 degree. If I find a program that can turn rotors which used HyGain DCU1 or Yaesu GS232 protocol by time, I turn it in the morning time to east. Any ideas?
On 10 I try to run WSPR from home, but not 24h a Day.

I'm getting some very strange decodes, so I'm not quite sure what's going on.

I'll let it run for a while, tx on 144.489,469 MHz.

Latest beacon design has 16 stored frequencies covering all bands 1.8 to 50MHz selected randomly. AD9852 DDS generates WSPR directly Feeds to broadband 6W PA driving untuned 7m high vertical antenna

I've been running WSPR for the last few weeks with just 50mW. Results so far are very encouraging, considering the less-than-ideal setup here.

I'm producing 50mW in the same way I did 100mW - setting the FT-897 to 5W, then backing off the audio into the FT-897 until the external power meter reads ~50mW. It's not an exact science, but if anything there's likely to be less than 50mW actually ending up being radiated!

Well pleased, I've finally managed to be heard in Australia. VK1UN on 10MHz SNR -28 dB!

Winter is easing its grip, but it is not yet time for antenna work, so the
anti-parallel dipoles mentioned in the previous post will have to wait.

While the weather is warming up, the 85 watts dissipated by the IC-761
during WSPR-reception is a bit of a waste; soon the shack will need
additional cooling with all equipment running. Therefore a "hundredfold"
reduction in rx-power is very welcome. Presently 15 volts 40 mA is fed
to a 7812 regulator followed by a 7808 to provide 12 and 8 volts bias to
four 8-pin chips, namely a SA612A - NE592 - SA612A - LM318H string.

SA612A mixers have very low bias, so they are prone to overload and
IMD when fed with wide input spectra. In this prototype receiver some
risks are taken, but narrow pre-filtering is expected to minimize the IMD-
problem. Due to the availability of standard crystals for certain frequencies
the 10140.2 kHz band-center seemed within reach with a 4.000 MHz and
a 6.144 MHz crystal. Both had to be pulled down a little off their nominal
frequencies for WSPR action. So we are talking about a superhet.

The first SA612A has the 4 MHz crystal in its oscillator section so
6144 kHz is serving as the intermediate frequency. Actually another
6144 kHz crystal is used as the IF-filter in the NE592 stage between
pins 2/7. It is in fact not a straightforward filter: it kind of "shorts"
two emitters of the NE592 at X-tal series resonance, which peaks
the amplifier gain enormously at around 6140 kHz. Bandwidth is not
much more than the 200 Hz WSPR-band, so it is quite a remarkable
response for a single high-Q component in that particular circuit.

The second SA612A makes a 6144 kHz crystal oscillate round about its
nominal frequency, so both the 4 MHz and 6144 kHz crystal have to be
pulled down with a series coil to arrive at band-center 10140.2 kHz with
1500 Hz BFO offset, actually in LSB mode. As standard WSPR offers

Please ignore my info spots 2011-04-01 07:24
No correct power info. Sorry. Run WSPR in XUbuntu
Now all ok! Good bay Windows :-(((

I am running a stand-alone WSPR beacon with my qrp SDR Cube with no stickin' PC! 1 watt in a G5RV on 40 m

Today I started running WSPR on my HCJB Pappradio SDR-Receiver. It's receiving only. Running on an 22m endfeeded indoor antenna I would see what this little thing can receive in WSPR Mode.

My handle is Basil from the City of Malabon ,Metro Manila ,Philippines

You can visit my qsl information at

I use the WSPRnet whenever I need to contact stations who are on the map.

So if I see your call-sign I will not hesitate to contact you 73 and Mabuhay! de Basil


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