Until I read the latest copy of QST, I had no idea what WSPR was. Having said that, I'm glad I took the time to download and install the software onto my computer - a home built Vista machine using an AMD processor.
Prior to using WSPR, I had the benefit of already having my K3 connected and setup for digital modes. I use DM780 quite a bit for PSK31 and whatever else strikes my fancy that day. The K3, using its built-in KIO3 board works perfectly with my computer's sound card and DM780 without any additional hardware required.
Setting up WSPR then wasn't too complicated; added my call sign, name, and CAT info and I was done. The first time WSPR set the K3 to TX however, I immediately pulled the plug. I had my K3's monitor on to hear the signal being transmitted, and what I heard sounded like an unmodulated carrier. I thought something was wrong with my connections but after reviewing again, couldn't find anything amiss.
A quick email to the Elecraft reflector relieved my concerns, as others who had previously used WSPR with their K3s told me that's what I should expect to hear. After carefully listening to the transmission again while connected to a dummy load, I could hear that the signal wasn't an unmodulated carrier; rather you could hear the tone "warbling" ever so slightly.
Now knowing that everything should be OK, I decided to try it again with my antenna back inline. After 2 minutes of receiving, the TX light came on and I could hear the signal being transmitted over the K3's monitor. After another 2 minutes, the K3 stopped transmitting and began listening again. Shortly afterwards, I checked the propagation map on this website and was excited to see my station appear. I was also shocked to see how many other stations heard my 5 watt transmission!