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.

This mode is amazing the way it gets through in an apparently dead or noisy band.

Last night we (Tony VK6HAM and I) were getting good results around the place on 20 metres. We decided to crank down the power - tony was able to get down to 1 watt, I couldn't get below 5. We were still getting into Europe and other places. I think I'll have to learn how to put my auto ATU a bit offside to reduce the effective output.

Today I was getting around in spite of finding my loop antenna had one of its four corners on the ground. It's been a bit windy today.

The latest:
I changed soundcards - working off a Sound Blaster now, and I tweaked the sound levels, in and out, and its performing much better, both on send and receive.

Whew! I thought I was going mad. Perhaps I am, but WSPR works!!

Hi all

Yesterday I had my first serious play with WSPR, and I couldn't get it to decode what it was hearing. I fooled around with sound devices, but that wasn't the issue. I connected to a few time servers and "synchronised" the clock. No go. I was receiving stuff, getting nice green bars on the waterfall, but had no call signs or other data coming up.

I read some of the postings here, and against what I thought was my better judgment, installed Dimension 4. Then the signals began to decode, and I was operational.

WSPR Frequencies are listed in the footer of each page on this web site. I noticed these on an early visit to the site, left it a couple of months before running the program, and could not find them again!! I expected a link to these frequencies, or to a "getting started" document. Eventually a web search turned up the table below. At the time, I did not record where I found it, but subsequent stumbling around reveals I cut it from Julian Moss, G4ILO's excellent article at which is an excellent "Getting Started" document.

After downloading WSPR and installing it onto my XP Home machine, and making sure that Dimension4 was installed and updating, I was treated to my first batch of calls that were decoded on 30 meters. Hopefully, there are others that are receiving my 500 mW from my FT-817ND...although from what I have read, 500 mW seems like quite a bit of power.


Greetings everyone. I'm actually here due to the inspiration from Mark KF6KYI. I have been a user of JT65A, and have been looking for the "next frontier", so to speak. I hope to not only learn more about this amazing mode, but look forward to making some incredible contacts as well...since first and foremost I AM a QRP enthusiast. (Using JT65A, I worked Belarus with 3 watts....I can't wait to see what else is possible)

Currently, I am running an Icom IC-740 (80's vintage transceiver) into a trapped vertical at about 15 feet AGL. The WSPR computer is also an antique - a Dell Inspiron 7500 (650MHz, 512 MB).

I typically run in receive mode on 30m overnight, followed by a short spell of active WSPR'ing in the morning. My station is also active in the evenings and at the weekends, but this is more variable.

When contacting me through these pages, please put useful identification in the Subject Line. My spam filter is quite aggressive.

Hi everyone,

Just a few quick notes on the WSPR setup here:

Location: Las Vegas, Nevada, Grid: DM26IE
Rig: Yaesu FT-897 usually @5W
Antenna: Yaesu ATAS-100 (mounted on roof w/ chickenwire ground plane)
Interface: WMR Rigblaster Plus

-Larry AC7SM

Hello I am new to this site and hope to hear from others, I usually hang out overseas in the Philippines and usually do mostly SSB, and BPSK31 for the moment but am getting started in the RTTY,and some other items. Not much interests in D-star as I dont have interests in Computer radios and its too expensive for me. Not many in Manila area use it.

Hope to hear from others and will be checking out the bands in February or March.

My WSPR image grabber is currently active at the following URL:
I am using Spectrum Lab and the images are gathered over an 8 minute period then uploaded to the site refreshing the old image, therefore you will see what I am seeing for that time period. The frequency is displayed on the right hand side of the image with the time intervals displayed along the bottom.
Please pass along any comments.


Only 300m from prior QTH.
Basic dipole cut for 40m up at about 20 ft AGL. Seems to load up on all HF bands. Dunno about efficiency, but can at least match it with the auto ATU. Sadly, it's in the trees. (contacting branches at both ends), so again, efficiency will suffer. Will eventually get up either my multiband trapped dipole, or a whole bunch of single band wire antennas. Plenty of trees and about an acre of land to play with.

The original owner obviously planted trees without regard to appropriate spacing for HF antenna installations. Never mind; at least I'm up and running.

Hi All,
I tried to join with 15m Special activities held on Nov.5 2008.
Thanks all participants.

The result is as follows:
Reported (8): ZL2TLD, 7L4IOU, JK1KTY, F6IRF, HB9TJM, SP3LYZ, T61AA, JA1MRE.

Heard(6) : ZL1RS, 7L4IOU, JA1MRE, F6IRF, T61AA, HB9TJM

Somebody asked abt my antenna.
It is made of twin-wire type material used here by telephone companies.

It uses linear stub to decouple rest of wire for 30m operation.
The same stub is acting as loading element for 80m so decreasing the overall length of antenna.

The following may give ideas to the WSPR'ers interested by 80m.

I built a RX loop - quick dirty job with plumber / electrical PVC - let say 2 hours work.
- The main loop is a single turn, made from 5mm diameter coax (only the shield is used). It is "diamond shape" 1m by side. It is tuned by a 358pF silver mica capacitor + a 5-60pF ceramic trimmer.
- The coupling loop is also "diamond shape" ; 25 cm by side inside the main loop.
- The SWR at resonnance, measured with the MFJ249B is 1.1

The WSPR 80m distance record which was held by W1CDO and ZL1ANY with 14529 kms on March5 fell 3 times today...

- The first one today was N2JR with VK7KRD with 16311 kms at 0612z
- Then followed by myself at 1612, also with Bob VK7KRD at 1612 with 16929 kms
- Finally G3SUY is the current record holder (once again with Bob) with 17326 kms at 19:10...

A special mention for Rich N2JR, who has the only 2xways and with 1 W !!!
Now we are looking for 80m long path !!!

73's Pat