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.

First WSPR qsl

Today I received my first SWL rpt by mail from Frank Hunger from Germany.
A nice postcard and a very nice letter with ofcourse the details from his reception report.
Thanks for this one Frank and a qsl card is on the way back to you.

Greetings Johan, PE9DX.

Wrong Power Reported

Up to an hour or so ago, reported power on transmissions
of 5 watts or less were understated by 2-3 db. This was caused
by my MFJ tuner reading 2-3 db low in the one watt range.

While MFJ does not spec the accuracy of the wattmeter in the
993B, it is inelegant to show two significant digits when
the measurement accuracy is less than one significant digit.

4m Beacon frequencies

Thanks for the suggestion of GB3RAL Graham. Unfortunately I can't hear it! I can't hear GB3MCB most of the time either.

GB3ANG 70.020 reads 70.019,89 so 110 Hz low on the dial.
GB3CFG 70.027 reads 70.027,75 so 750 Hz up on the dial.

So no consistent shift and so I don't trust the accuracy of the beacon frequencies.

I'll try 28.028,80 as my dial freq for WSPR today & see if I can spot you & Brian again.

Milliwatt with my Minimalist 2.0 Sound Card Interface

I decided to try something fancier than the Minimalist
sound card interface I described previously.

For the 2.0 version I bought two Radio Shack 600 ohm
isolation transformers. These sell for about $4 and
come with leads. I kept the 10-turn trimmer I used
with the previous interface and added a forward facing
pot to the circuit. Now the transmit audio from the sound
card goes to one side of an isolation transformer. The other
side goes to the trimmer pot. The arm of the trimmer goes to
the front panel pot. Set the sound card output to full
as well as the front facing pot. Adjust the trimmer to get
max output from the radio with little or no ALC reading.
Between the radio's RF OUTPUT control and the front pot
it is reasonably easy to set the RF output anywhere from
100 watts to one milliwatt.

It may be necessary to add a parallel combination of a
10k resistor and several mfd cap between the sound card
output and the isolation transformer if the sound card
will not output to the transformer directly.

The receive audio goes through the other transformer
to the audio card's input.

Keep the grounds separate to avoid ground loops.

First attempt at 4m WSPR

This hasn't worked so far.

I'm pretty sure the clock is pretty well synchronised and the antenna and transverter are working pretty well. The WSPR software worked fine on 10m with sensible-looking decodes.

The problem may be that my rx frequency is off. I'm having a problem checking this as the only beacon I've heard recently is GB3ANG.

With the FT-817 rx dial freq at 28,019,160 Hz (transverted from 70MHz band), Spectran shows ANG at 650 Hz. So adding those, I get 70,019,810 Hz for ANG's freq on my rx. It's advertised as being on 70,020,000 Hz, so I'm reading 190 Hz low on the receiver. Enough of a shift to miss the WSPR band.

I have found some other beacons, but I haven't identified them.

I'll leave WSPR listening on 4m this evening (Fri-23-Jul-10), 190 Hz low and see what it finds.

Using WSPR to test antennas

I have two wire antennas pointed in different directions: an inverted V pointed NE/SW and a bob-tail curtain pointed NW/SE. WSPR has been useful in helping me see if the antennas really have any directional characteristics. Indeed, they do. The inverted V gets me into NE Canada and Europe in one direction and SE Asia in the other (from WA state). The bob-tail curtain shows directivity into South America in one direction and Japan/Siberia in the other. State side, both antennas seem to be about equal with, perhaps, the bob-tail curtain being better for Florida.

Intermittent Connection with Radio Shack Plugs

I picked up a pair of fancy 1/8 inch mono Radio Shack
phone plugs for the latest iteration of my rig interface.
Everything worked normally until Thursday afternoon
when the stations stopped receiving my WSPR signals.
The fishfinder also showed no output. Adjusting audio
and RF gain for full output yielded nothing. But the
radio's microphone got out normally.

After a few more checks I located the problem. The
connection between the solder lug and the tip of the
Radio Shack connector was loose. The factory riveting
wad defective. A hard squeeze with pliers helped things,
but I will be looking for another connector source.


Using a Trio TS-440s at 5 watts. The antenna is a Hustler 5BTV vertical ground mounted about 100 feet away from the shack. Quite a number of ground radials but could do with a few more and have run out of junk cable.
Have a little problem keeping the output power at 5 watts, it can vary between 4 and 6 watts between tranmissions, maybe a temperature effect.


This is a comment about the choice of 7.040 as the WSPR frequency on 40 meters. I recently posted a benign comment on the QRP list about openings in propagation based on my spots on the 30 meter band, and received a polite but negative comment from a ham who loves QRP CW on 40 meters. His negative feelings arise not from 30 meters, but from 40M. He points out that 7.040 is still a QRP calling frequency, occupied by CW ops for many years. There always was a kind of loose "truce" with the RTTY ops who also, unfortunately, claimed this same frequency for many years, and the ARRL has listed both modes on this frequency. Now, however, with the popularity of WSPR and its long transmission time, and its automatic long running nature, it is a problem for CW ops. Frankly, considering that WSPR only needs 200 Hz of bandwidth, why can't we just move the 40 meter frequency up a few KHz? The forty meter conflict is responsible for considerable ill will among QRP ops, and is unnecessary. If this has been raised before, I'm sorry. But even if it has, I hope that the power behind WSPR (Joe, are you there?) will consider a small change.

Preston WJ2V

SS/SR @ Top Band

I will be qrv sunday from local sunset till next morning sunrise 18/19 Juli for some RX test on Top Band.
Will be only RXing with my ALA 1530 loop antenne, will put him in direction NW/SE.
So lets see what we can receive this night.

Johan PE9DX.

First try with WSPR

As a longtime user from WSJT programs for MS and EME I also tried the WSPR program after some talk with Jan PA3FXB last friday at our clubmeeting.
Saterday I RXed a whole day and night on several bands, and on sunday I also did my first TX attempt.
Was very surprised to see my signal was received at many places in EU and even in the US!!
I am using about 1 to 5 Watt out from my FT-920, as antenne I have a 1/4 wave vertical tuned for 20 meter only.
Is great fun to see it is working in combination with the internet page WSPRnet.
Well done all!!

Greetings Johan, PE9DX, JO33md.

10 meters today

Been running 5 watts on 10 for hours with no spots. Bumped it to 10 watts and seems N5VP heard me. Using a 10 meter Ringo at 20 feet.

Jim ... K8CXM


had rig activated whole day on 17mtrs, but only AB3IU hrd, lots of RTTY.
Now listening on a vertical antenna.

160 Meters - Results!

Last week was a bust. Tonight...results.

2010-07-13 04:16 KU4XR 1.838078 -25 0 EM75xr 5 KA1GMN EM12ku 1243 259
2010-07-13 02:44 KA1GMN 1.838054 -28 0 EM12ku 20 K3SIW EN52ta 1277 35
2010-07-13 02:44 KA1GMN 1.838055 -26 0 EM12ku 20 KU4XR EM75xr 1243 71


I'm exploring WSPR for the first time. This is also my first attempt at a digital mode besides morse code. I'm not clear what the maximum spottable frequency is.
I'm using my old Dell lap-top running Win98SE with an FT-817.
I intend to try 6m, 4m & 2m with WSPR. I would like to try 70cm & 23cm.

More on Linux

I changed from DTR to CAT for PTT and gained rig control in the bargain.
With the 756pro antenna on Auto, the antenna switch remembers the setting
for each band. Nice.

Using a dedicated sound card for both send and receive seems to make WSPR
stable under Ubuntu.

I had to download, configure, and compile the current hamlib to get the
756pro to play under WSPR. With Fedora, the list of rigs on station setup
comes up blank. Entering the rig number manually makes it happy.

Under Ubuntu, WSPR would not save and restore the 756pro selection.
I suspect entering the rig number manually would solve that.

4m Wspr Update.

Posted also on The Four Metre Website:

Yesterday was a good day for 4m Wspr: Stations in Essex, Northamptonshire, Merseyside, Greater Manchester and Cumbria were spotted, or spotting, on the band. The four metre Wspr database runneth over!

I will be on air every evening whilst the radio works, usually between 5-9pm for anyone who wants to try. Generally pointing South-East towards the continent (anyone out there?) horizontally polarised. I can switch to vertical given notice.

If you want to try and you have no one to listen drop me a message and I'll happily try and spot you.

Thanks to everyone who had a go, it was fun.


Windoes 7: More Fun and Games

A little while ago I got tired of XP wasting more than half
my office computer's memory. I coughed up $125 to upgrade
to Windows 7 64 bit premium. If there justice, the cost of
W7 should be subsidized by hardware makers. Let me count the
ways W7 forced hardware upgrades:

Video board - The current video drivers for a Nvidia 9600gt
caused the status messages for WSPR to disappear. Upgrade
to ATI.

Sound board - I had been using a SoundBlaster Live! with WSPR.
No support. I got a $13 board that worked for a while, sort of.
It quit working when I added isolation transformers to the radio interface.
Now I am using a $90 Xonar DX board which is reputed to have W7 drivers.

Oh, the motherboard clock does not work well W7. Loses time like an
old wind-up wristwatch. The W7 sync doesn't work well enough for WSPR.
Windows 7 protection bollixes Dimension 4.

And there are several other perfectly good devices that don't work with W7.
People bitch about Linux not supporting devices! Offhand I'd say W7 is worse.

Please can we have a 4M filter on the map?

Most bands on the Wspr map have a filter in the drop down menu. 4m is absent even though it is possible to filter results for 4m in the old database. A very few of us in the UK are trying out 4m Wspr. There are allocations in this band being made available across Europe so there might be others out there who don't realise we are trying (some would say very trying!) :) It would be much easier to get people to try if they could see the activity as per the other bands.

Thank you for reading.


Ic-7200 joy

Since I first joined here, I renewed my license and upgraded to Extra!

Just this week, with the help of a post on the forum, I was able to get the IC-7200 fully functioning with WSPR on Windows. The tasks are as follows:

    - Go to sourceforge (link) and download HAMLIB v1.2.11
    - unzip it. We need just three files.
    - Find hamlib-icom.dll, rigctl.exe and libham-2.dll. Copy these to the wspr program directory. We want to replace the existing versions.
    - Find the text file "hamlib_rig_numbers" (at least it seems to be all plain text) and add this line somewhere:
    361 Icom IC-7200 0.5 Untested
    The above is a direct copy paste from my own file.
    - Start WSPR. See if it complains about something in the hamlib_rig_numbers file. I messed with it for some time, I couldn't see what it was unhappy about, but I eventually got it to take the new line.
    - In setup, select:
      -- PTT Method is CAT

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