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.

Dear DK8FT,

I am comparing the efficiency of my antenna system with yours DK8FT. For that reason I would like to know which antenna you are using in the 40, 30 and 20 m band.

Many thanks!

73, Mike DL1MMK

My signal from Boomerang was copied in Australia on 20 m. Nothing is impossible with WSPR..............

I would like to have a lot more QSO with WSPR with WSJT7, I use the 40mts 7.076.0 mhz Freq from 13:00-17:00 UTC , 20mtrs 14.076.0 Mhz. 17:00-20:00 UTC. Then back down to 7.076Mhz 01:00-07:00 UTC Everyday of the week. NY7U

A beta release of WSPR 2.21 r2286 has been posted at:



As in r2283, this version includes a "Coordinated hopping" mode in which the selected band is determined by the starting UTC minute of a Tx/Rx interval:

In response to a recent Facebook (social media is good for ham radio!) post by N2GJ & the recent QST article, I thought about giving WSPR a try.

My only current computers are Macs, so I went about trying to compile wspr, but no joy there – I keep getting compile errors that seem to be pointing to f2py.

Anyway, I finally got it working by running a Ubuntu Linux session in a Parallels window.

WOW, pretty amazing what a few watts could do into a lousy antenna.

Rig :FT-450D
Tuner: :MFJ-929
Antenna :Slinky dipole in attic facing 045/135. Dipole is made with 2 Slinkys on either side stretched to 15 feet on each side.
Interface :SignalLink-USB

If you have been testing WSPR 2.2 with its frequency-hopping feature, please upgrade to revision 2283. Direct links for download are:



This version has several new features:

1. A checkbox labeled "Coordinated bands" is now available at the bottom of WSPR's Frequency Hopping screen. If this box is checked, the first-choice selected band will be determined by the UTC minute at which a 2-minute sequence starts:

UTC Band
Minute (m)
00 160
02 80
04 60
06 40
08 30
10 20
12 17
14 15
16 12
18 10

20 160
22 80
... etc

The sequence of ten possible bands repeats three times each hour. If the first choice band has not been checked as an active band, a random band choice is made among those that are active.

Decision whether to receive or transmit is purely random, using the "Tx fraction" for the selected band.

If all WSPR stations using frequency hopping use the "Coordinated bands" option, a sizable group of us will move together from band to band. During any particular sequence, something like 20% of the stations (depending on their Tx fraction settings) will transmit, and the rest will receive. The average number of spots will be much larger than that if band selection is random. If a band gets too crowded -- say, if you often see more than 6-8 stations in one sequence -- you should probably reduce your Tx fraction for that band.

Потрясен возможностями!

I don't know what this noise is but I made a short video of it and how it looked in my PowerSDR panafall. It was on 30 meters.and was stronger up the band.
Here is the youtube URL

IF you know what it is please comment this was in between 22:00 and 23:00 UCT December 5th 2010.

First day listening on 30M.

very bad QRM at my QTH on 20m. Had to shut down.

After processing nearly 3.5 million WSPR spots from November, there turned out to be about 243,000 unique spots (based upon spotter, station being spotted, 4 character grid squares, and band). Stations WSPRing from multiple 4 character grid squares may have higher totals than those stations operating from just one grid square.

The top 10 stations spotted in November were:

It may seems to be strange that someone uses CB equipment on HF bands. But this stealth antena is great solution for balcony work. Some guys in US spotted before me that boomerangs work surpraisingly well on higher HF bands when tuned with an antena tuner. Of course it does not give a chance to do far DX on regular way, but you can be active especially in digital modes. At this time I don't have a possibility to have a full size antena. The QRP work causes no problems with the neighbourhood.

You may have noticed that a few of us have been playing with a version of WSPR that does automatic "frequency hopping" from band to band. For this we owe a big vote of thanks to Sivan Toledo, 4X6IZ, who wrote most of the initial frequency-hoppping code.

If you would like to try WSPR with frequency hopping, a beta-release of WSPR 2.20 is now available at



Select "Frequency Hopping" on the Seup menu, and you'll get a screen allowing you to select any desired mix of bands and Tx fractions. Then check "Frequency Hop" in the main window, and WSPR will start its normal 2-minute sequences, switching bands randomly after each one.

Depending on your station and antenna setup, you might need to accomplish other switching besides re-tuning your radio. To make this possible in an automated way, whenever WSPR executes a successful band-change command to a CAT-controlled radio, it looks for a file named "user_hardware.bat", "user_hardware.exe", or "user_hardware" in the working directory. If one of these is found, WSPR tries to execute the command

user_hardware nnn

where nnn is the band-designation wavelength in meters.

You will need to write your own program, script, or batch file to do the necessary switching at your station. I wrote a very simple Python program for this purpose. One of my antennas is an "all band" dipole fed with open-wire line through an automatic antenna tuner. Others include a 160m vertical and a tri-band trap dipole. The antennas are selected automatically, by band; and when a transmission on a new band starts on the all-band dipole, the tuner adjusts itself during the first few seconds of the transmission.

My wife K4PRM and our daughter were inspired to WSPR by
Joe's lecture at Georgia Tech last Saturday for the Ham Jam.

This is what I've learned so far, after trying to setup WSPR the wee hours.
As it happens sometimes, the computer does not work for you, rather you work for the computer!

In this case, I am working with:

* Windows 7 on an el-cheapo Lenovo laptop
* Laptop audio provided by the internal Conexant High Definition SmartAudio 221 sound card.
* A Navigator USB rig control connected to the CAT-V port on an Icom 756 ProIII.
* Some resonant wires strung in the trees.

But nothing showed up in the waterfall.

Here is a list of things that I encountered before I could WSPR:

1. I heard that newer Windows platforms may prevent recording audio from an external or streaming source.

2. My details are a bit sketchy, but Leo LaPort talked about how the
RIAA and the DRM crowd may have influenced PC mfg's to prevent users from recording audio streams.

3. I first ran into this problem when trying to record Neal Boortz streaming
from with Audacity.
I got "Error opening sound device when recording".
Therefore - if Audacity could not hear Neal Boortz, then WSPR could not hear the Icom radio either.

4. Audacity has some very good help that applies to being able to record streaming audio,
and "hear" WSPR audio when using Win 7 here:

5. My work-around is to use an external sound-card. In my case, I'm using the Navigator USB sound card-to-CAT-V interface.

6. I had to add WSPR to the list of "allowed" programs to punch through the Windows firewall.

7. You'll know this problem when you know you have RF coming into the radio, and the radio
is sending audio to the sound card in your PC, but you don't see much color change in your waterfall display.

Ham radio competitions are much more fun when you don't need to wait six months to see how you did! Results for last week's ARRL Frequency Measuring Test are already available at . Hearty thanks to those responsible for running this interesting and highly educational event!

Today, I think for the first time, I have unleashed one of my "old ladies" into WSPR action.

The "old lady" I am referring to is an FT-101ZD Mk3 which I brought back from the dead a few years ago. An EBay "tech special" in US terminology, or "spares or repair" in terms of UK terminology.

This features on my web site ( so I won't repeat too much I have already covered elsewhere, but I think I have proved to myself, at least that these old radios can, with care be used reasonably successfully on today's modern computer-generated modes.

I have been spotting stations with this radio for a couple of days, and today, I enabled transmission and others have spotted me.

The principal disadvantage with the older radios is that of frequency stability, or rather the lack of it.

On my "to do" list for this radio is to (hopefully) improve this facet, probably by replacing the zener diode based voltage stabiliser to the VFO with something of somewhat higher specification (eg low-dropout IC regulator, or similar) as this is where I think the thermal stability weakness lies with this particular radio.

However, having allowed the radio to warm up for some considerable time (four hours) the case temperature of the radio is still gradually increasing but at a very gentle rate. Yesterday the case temperature crept up ALL DAY, as did the VFO frequency error!

Nevertheless, I regard the performance as just about good enough for me to join in the WSPR fun. The results will be stashed away in a spreadsheet on my PC and used in a "before" and "after" type comparison once I decide to tackle the thermal stability issue.

In the meantime if any other WSPRers are wondering why their "drift" as received at G4FUI isn't quite as good as they think it ought to be, then the above hopefully provides some sort of explanation!

On the air since 1948, Signal Sgt. of the Royal Scots Greys (Second Dragoons.)

I'm sure 1 watts or half is nice choice when too many people using WSPR. This is weak signal propagation tool, not digital DXCC way !