17 Nov 2011

137kHz transverter picture

137kHz transverter with FT817 and SignaLink USB in the background
Thought people might like to see the current version of the 137kHz transverter used for WSPR transceive. The heatsinks are total overkill as they barely get warm when producing over 20W RF into the loop antenna. I am regularly getting reports from a couple of stations 250km away. M0BMU (69km) and G0WCB (101km) are reporting the WSPR signals almost all the time. It works but needs boxing, when I get time.

1 comment:

Anonymous said...

I have four projects that need boxing up, but I keep going back and experimenting with the circuits. What power fets
are you using In PA .IRF510's ?