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.

built a new wspr 10 transmitter

post if you can here it.

73 Niece/KA1ULN

Hi Guys,

Now have Ultimate3s running aboard our sailboat Gabrielle.

Output is standard single transistor output of 100-300mW with antenna being ~15m long-wire suspended from the mast with no ATU or tuning.

Running in extended WSPR mode to improve accuracy of vessel position.

Operating 80, 60, 40, 30 & 20m.

73, Ian.

Today my WSPR transmitter from Zacktek arrived and it took 10 min to be on air with it.
I was really surprised how many stations could hear me within the first minutes, even on 15m.
The station will be running on my yagi antenna 24/7.

73 de Roland, DF3LZ

To test the theory that some duplicated bad decodes are the result of multiple strong stations being received, I looked in the wspr database for VK3 transmitters on 2m over the past month.

I found 29 VK3 callsigns that were hybrid decodes (3 different stations transmitting, resulting in 4 different decodes).

I ran 4 instances of wsjt-x - one as a receiver and
the other 3 as transmitters (through virtual audio cable). The transmitters were at 1480Hz, 1500Hz, and 1520Hz - this created several signals across the entire waterfall every 20Hz.

It has (coincidentally) been a year and a week to the day since I joined wspr, and I found this blog button.

I have to say that I have thoroughly enjoyed tinkering with, and learning from wspr as I have built and tested many wire antennas over the past year.

Cheers to wspr!


Just went on WSPR with my TX-500 for the first time. Using Digirig sound card that I just received and Chameleon vertical at 13 feet. QTH: FM17ta, southeast Virginia.

Merry Christmas!

My Christmas WSPR outing for the QCX+ on top band was fun. I will be downloading the DB to analyse the signals, but so far so good. I can see drift as I'm not locked to GPS yet but results overall very good.

I'm currently static maritime mobile near Goole Docks UK. (IO93) just off the tidal rivers Ouse and Humber, which leads out to the North Sea. I don't think there is much salt water in the marina as it's behind Ocean Lock and a little inland by about a mile on a freshwater river.

Hi i am happy to see that my small wspr signal has been recived in canada .

2021-12-17 21:56 OZ1KVB 0.475704 -22 0 JO44vv +20 0.100 VE9GJ FN77ha 5077 3155 WSPR-2

vy 73 de oz1kvb

Hi all.
I am running a Black Friday Sale fora few days so if you want to get a standalone WSPR transmitter this can be a good opportunity for you.
Check it out at

The Sale is over, thank you all.

If anyone knows a WSPR server staff member that could change my WH2XND grid location back to DM33XT it sure would be helpful!
DM33XT is approx. 20 miles due north of Phoenix AZ. map shows Im located in Tonapah AZ.
Making changes in my WSPR account does nothing.
Thank You, Ron WH2XND/NI7J.

My TAPR 20M WWSPR transmitter putting out 1/10th Watt is no longer being heard by anyone. This seems to have happened only for the past day so not sure what is wrong. I use a 20M Magloop and it is returning an SWR of 1:1 so I'm inclined to think it is not the antenna but possibly only conditions in Western Australia.
Any ideas?
Thanks, Merv VK6BMT

With the help of the site, it becomes possible not only to listen to the broadcast from remote SDR receivers, but also to process the signal on your computer.
First, you need to install a virtual audio cable on your computer, and in the browser a special extension for redirecting the audio stream to this virtual cable.

Half way around the world is about 20,000km.
My record so far is over 17,000km (40m) but I might be limited by geography - 20k is in the middle of the Atlantic.