5 Band – 2 Antenna WSPR TX

Its a bit of a dogs breakfast to photo, but this is the latest incarnation of my wspr transmitter. The top board is the PA for 80/40m, the 2nd board down is the PA for 20/15/10m and the bottom board is the LPF for those bands. The single LPF is for 40m which makes it marginal for 80m, yeah its a sine wave, but you know its not going to have ultimate attenuation, so I need to build another switching LPF board for 80 and 40m.

Power out is about 5w on all bands with 20m being the lowest at around 4w. More than good enough for what I want to do. I plan to start it up again tonight and leave it run all night and see just where I can be heard.

As far as working goes, spots on 3 bands means that both PA and antenna are doing at least something.


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