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.

WSPR 1.1 is now into r1045.
Someone said they thought they had r1045 but the Version displayed was WSPR1.1 r1042. I also could have sworn I saw r1043 and have been calling my compile which I try on multi distro's r1042/3.

The current source code WSPR 1.1 r1045 compiles and runs on Ubuntu8.10.
As promised here is the definitive list of dependencies. If you install Ubuntu 8.10 afresh all you need is.

python-numpy 1.1.1 (no problems with this version here yet)
python-imaging tk

I have been looking everywhere on this website for the WSPR 1.1 link. I had found it a few weeks ago, but lost it. However, I did download the 1.1 package previously, so I posted it to my Windows Live case anyone else wanted to have it as well.


Completed the installation of a remote antenna tuner at the base of my 160m inverted L this afternoon - just before the heavier rain started.

Can already see a significant improvement on receive having copied HG8LMQ and IK1RKU for the first time on 30m. Judging the transmit improvement will take a little longer but also appears to be better.

I've attached a picture of the temporary center loaded vertical I've been using on 30m for the last week.

How about the following idea?

A special activity on a pre chosen band on a pre chosen day.

Split the wspr band in two parts (lower and upper 100Hz)
Use the upper 100 Hz for wspr beacon mode, max 20%tx max 1Watt (wspr software).
Use the lower 100 Hz for wsjt qso mode (mode wspr) max 1Watt. (WSJT7 software).
One could use the two programs at the same time, however if you wish to make a qso you have to switch wspr in rx mode for the time of the qso, (no big deal).
So one could try to call a station seen in the upper 100Hz and make a qso in the lower 100Hz, (and send a qsl?).

Any idea what ive decoded ???

While running a wspr beacon on 70,030.000 carrier frequency, with
g4wgt, this evening, I started to decode what looked like wspr-qso
mode traffic .. one with 17 sync pulses must be 100% decode , but
TV6XVL what call is that from ??

081213 2208 17 -11 0.0 10.140215 73 DE TV6XVL NA98 -4

D4HAC was listed on the decoded call list as was just the number '3'
at one point
OZ5HAF ? nothing in qrz or even google ?
If NA98 and IA96 are qra locators then things are starting to get
silly ...

Larry AC7SM asked for any links to homebrew attenuators.

Well Elecraft fit in there somewhere and they make some really nice mini kits as well as the excellent K2 and K3.

Check out the AT1 41 dB HF/VHF Switched Attenuator kit at

Pretty sweet for WSPR if you have a radio that can already go down to 2W.

If on the otherhand you can't get the fine power control needed from you radio how about using a directional coupler with a dummy load with the stepped attenuator (CP1 and DL1).

Does anyone else ever see this phenomenon? -see attached WSPR screen captures

I have been seeing it during the late afternoon and early evening time frame here in the southwestern US.

Also if anyone has any links to homebrew attenuator projects please post.

Cheers from chilly Las Vegas! (currently 47 degrees F)

-Larry AC7SM

First, from a new member and interested weak signal newbie, hello to all. I hope to be seing many of you on the decode screen soon.

I'm not new to amateur radio, first licensed in 1963, but I am relatively new to the digital modes and especially VHF/UHF. I have set up a simple V/U sat capability and will continue to imprve it and add for a potential EME set-up.

I'm also active on HF with Jt65, olivia, hell, and psk.

Motivated by the QRPp day on 30m (and stuck without a ready to hand attenuator to knock down the output power of the TS-2000 further... I decided to grab a manual antenna tuner, put it at the base of my 160m inverted L and load it up on 30m.

This is a second "temporary" antenna for 30m - I've been using a short home-brew vertical that I use when portable - its about 12 feet high, center loaded with 4 short (non-resonant) radials.

When is it too soon to say ? Well I have had no crashes yet.
I am living the Linux dream. I no longer need to change computers to change to WSJT7 WSPR QSO mode and WSPR1.1
I have not run Windows in the shack for a couple weeks, all mode operation on Linux is a possibility.
Apart form a few GUI issues which I have cured on WSPR, all is great. My compiles can be sent to OZ1PIF for test and they are stable.

A few tips for those running Ubuntu 8.10 and compiling. In addition to the instructions from

I was spotted @13h20 by CX2ABP using .002w and 3elts/tribands beaming 0 degree in the 20m.The distance is 9217km.wx was and still rainning this monday 9 december.Tnx to Joe/K1JT.
Nw i m txing with .001w to see the best distance i can reach with the beam always to 0 degree.

Ok all.

You clicked on the link to see if I had a blog entry, well here it is!

I've been a ham since 1996, I am currently a General Class.

I love the digital modes, psk31 etc, etc.

I'm gonna download the software for WSPR tomorrow (it's LATE here ...!) and give it a try. Maybe push the limits with 1 watt ....

Best 73's to all,


I'd sure like to see more activity on these bands. Any takers?

I am simply floored at how effective MEPT_JT/WSPR is at conveying data/signals at low power over long distances. Today being no exception, HA5MRC, the Muegyetemi Radioklub in Hungary received my 250 mW signal...for a nice miles per watt of 17752 miles!

Not bad for a quarter of a watt into a low antenna.


This is really fantastic my signal spotted in VK thanks VK6POP and VK6AAL
all with 5 watts and a random longwire not even very high!!. This morning spotted on east coast USA with 1 watt. It's got me thinking about antenna radiation angles and propogation all over again!!

Who needs a KW and beam

Brian G6HUI