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.

1500km "hearing" on the 817 and a piece of wire is fabulous. 900 km "heard" on 500mW and the same piece of wire is even more so.


I am using WSPR for some time now, but continue to be amazed of how useful it is to test equipment and help our experiments!
This morning i have decided to plug the antenna, even my I/Q signals are not exactly in balance and I have a bit of sideband
in the signal. I would have killed for one spot, but i got plenty.

Currently on air with 7 dBm, 50 meters of cheap coax as feeder. Signal measured with the analyzer:

I've been wanting to reduce my transmit power below the 5 W permitted by my TS-2000, and I've been too busy to build an attenuator -- that's going to have to wait until after the holidays. Several helpful users suggested reducing my transmit audio to get the power that I wanted, but my SWR/power meter didn't have fine enough scale divisions to help me decide what audio level to use.

As you may know I wrote a handy little web script that generates maps of WSPR activity ( ). I rely on the nightly batch files of wspr contacts that until recently have been available for download on this site. Does anyone know why they've stopped being produced?

Thank you and 73 de k4det

Bla Bla Bla Blog

NEW - Points to consider in resolving the issue of ARISS voice operations in the 2 meter WSPR frequency segment outside of IARU Region 1:

Worldwide 2 meter WSPR activity on 144.4905 MHz has increased over 100 fold in the last 6 months, with operations currently primarily in North America, Europe and Australia. This has increased the potential for mutual interference with the ARISS uplink frequency of 144.49 MHz in IARU Regions 2 and 3. ARISS uses 145.20 MHz for the voice uplink in Region 1.

We have been advised that there is no concern for interference with scheduled event and school voice contacts as ARISS conducts these activities on alternate unpublished uplink frequencies. The ISS team members may use the 144.49 MHz ARISS voice uplink frequency only sporadically for recreational contacts.

AMSAT is interested in this matter, and Frank Bauer, KA3HDO, has related the difficulty with which ARISS coordinated its current frequencies:

"It took a lot of coordination over many years to get SAREX, now ARISS, on a consistent band plan. I have been doing frequency coordination for ARISS and SAREX since 1991. It was very painful to get this coordinated internationally. Especially within Regions 1 and 2. I think you know that ARISS can’t use 145.20 in Region 2.

The big issue we (ARISS) have on 2 meters is that we need the transmit and receive frequencies to be split on voice. And they will need to be separated beyond the OSCAR weak signal subband (145.8-146). This would not have been an issue if the second OSCAR subband (around 144.3-144.5) was still in place. But that was reallocated to other domains."

We would wish to collaborate with AMSAT to avoid interference with future ARISS activity on the 144.49 MHz frequency that we currently share in IARU Regions 2 and 3.

Carol F. Milazzo, KP4MD/W6

Hi All,

N3IZN and W6SZ have been running WSPR tests during a couple of weeks.

Here is one day of reports:

46 spots:
Timestamp Call MHz SNR Drift Grid Pwr Reporter Grid km az
2012-11-12 03:20 W6SZ 368.406480 -18 -3 DM14ed 0.5 N3IZN DM13ji 96 156
2012-11-12 03:18 N3IZN 368.406515 -10 1 DM13ji 1 W6SZ DM14ed 96 336
2012-11-12 02:56 W6SZ 368.406486 -24 0 DM14ed 0.5 N3IZN DM13ji 96 156
2012-11-12 02:54 N3IZN 368.406515 -18 -1 DM13ji 1 W6SZ DM14ed 96 336
2012-11-12 02:44 W6SZ 368.406485 -23 -1 DM14ed 0.5 N3IZN DM13ji 96 156
2012-11-12 02:40 N3IZN 368.406510 -17 1 DM13ji 1 W6SZ DM14ed 96 336
2012-11-12 02:36 W6SZ 368.406486 -24 0 DM14ed 0.5 N3IZN DM13ji 96 156
2012-11-12 02:24 W6SZ 368.406489 -20 0 DM14ed 0.5 N3IZN DM13ji 96 156
2012-11-12 02:16 W6SZ 368.406487 -20 0 DM14ed 0.5 N3IZN DM13ji 96 156
2012-11-12 02:02 N3IZN 368.406505 -11 -2 DM13ji 1 W6SZ DM14ed 96 336
2012-11-12 01:34 W6SZ 368.406505 -21 -1 DM14ed 0.5 N3IZN DM13ji 96 156
2012-11-12 01:30 N3IZN 368.406492 -12 -2 DM13ji 1 W6SZ DM14ed 96 336
2012-11-12 01:26 W6SZ 368.406507 -20 -1 DM14ed 0.5 N3IZN DM13ji 96 156
2012-11-12 01:24 N3IZN 368.406490 -12 2 DM13ji 1 W6SZ DM14ed 96 336
2012-11-12 00:44 N3IZN 368.406520 -16 -1 DM13ji 1 W6SZ DM14ed 96 336
2012-11-12 00:28 N3IZN 368.406517 -11 -1 DM13ji 1 W6SZ DM14ed 96 336
2012-11-11 23:56 N3IZN 368.406501 -11 1 DM13ji 1 W6SZ DM14ed 96 336
2012-11-11 23:52 W6SZ 368.406528 -18 0 DM14ed 0.5 N3IZN DM13ji 96 156
2012-11-11 23:28 W6SZ 368.406551 -17 -3 DM14ed 0.5 N3IZN DM13ji 96 156

Hi There,

it took me a few months to be qrv with Wispers,

the reason is complex but the anwer is more than simel, the soundcard in combination with my FT950 is complete a mismatch (all the other digmods works fine)

Next time better,

Regards Carlo

There's a VHF/UHF field day contest coming up in VK land so in preparation for it I swapped a vertical 2m yagi to horizontal. It's currently running WSPR, 7 elements (10dBd) beaming SW over Sydney from Newcastle. This is my first experience with VHF DX so any reception reports would be most welcome!

For the last two months I have left a 40m "WSPR Beacon" running using a Genesis Radio G40 SDR woth GSDR software, Virtual Audio Cable and WSPR.

Most days reports have been received from central and east coast USA and Tasmania, and "watching" the propogation has been fascinating. This culminated in a talk about WSPR given to the Spen Valley Amatuer Radio Society ( ) which was well received.

Having got WSPR and WSJT working on my Ubuntu laptop, the next challenge was to get WSPR working on the more restricted Raspberry Pi

The story of my success is at (dated 3/11/12)


ww2r g4fre

Just finished successful completion of a kit from openbeacon for 30m
Now looking for cheap 30m mono band aerial design which I can dedicate to my beacon as I only have 1 HF aerial.

Well, I thought retirement last year was going to make it so much easier to work on the air and get some action going. Friends told me that I would be busy but nothing, repeat nothing, surprised me more than to find out that I just don't know how I found the time to work!
Well, after some soul searching, I have decided to withdraw from some (not all) of my voluntary community work after 3 decades, on the most part, of giving my time freely. I now hope to be able to return to the shack, as most of my operating over the last 10 years has been mobile (HF & VHF).

Does anyone know of any tx setup tools ?

I have a TX kit here which generates the tones, but trying to setup the desired FSK shift
and seeing if the data is being sent correctly is very difficult.

At the end of the day, attempting to see if homebrew equipment is sending the right tomes
relies upon making a transmission and relying upon the WSPR software to see if a decode has been

Very long and tedious !

Best dx so far today on my one watt to 2 el Moxon: RZ6AVM in KN95la at 3039 km.

Hi all

I just connect my Parallax Propeller WSPR transmitter to my 10MHz frequency OCXO with DCF77 synchronisation. So if the system is running stabil, I transmit at different WSPR Bands at AFcenter +23Hz. See if you are receiving at the right frequency.
More information about my rig see at callsign at

73 de Peter, DL1FX


N3IZN and W6SZ have been running WSPR transmissions on 10 GHz ( 3 cm )
now for some time.
We hope a new channel could be added in order to use all features of
the WSPRnet.

A this moment we are using 10368.405 MHz as dial setting ( this is temporary arrangement )

Exchanged reports can be viewed by selecting either "N3IZN" or "W6SZ" as call and reporter.

73 Rein W6SZ

If you are on 160 meters, or perhaps on 472 or 137 kHz, you may be interested in a new mode called JT9, designed especially for making QSOs on these bands. JT9 uses the structured messages introduced in 2003 for the JT65 mode, now widely used for EME and for QRP operations at HF. JT9 can operate at signal levels as low as -27 dB (in a 2500 Hz reference bandwidth), with one-minute timed transmissions. It also offers slower transmissions of 2, 5, 10 and 30 minutes duration, and the slowest mode can decode signals as weak as -40 dB.


My interest is mainly to observe propagation over the bands for my own education.
Until now I did use mainly FAROS for this purpose, because it gave me a nice graphical overview. The disadvantage was that the beacons from the International beacon Project are limited in numbers and only from 20m to 10m band.

So I was really missing 40m and 30m.

When I heard that WSPR 3 has a "frequency hopping mode", it was time to google for the program and try it.