Hello Harry, is there any way with the WSPR Desktop transmitter to fix the transmit frequency used for each WSPR band instead of randomly using a different frequency each time around. My preference is to manually set/enter the transmit frequency to use for each band using the control software. I know that this would require some programming changes and you may not have the room in the Arduino MCU to do this. I think that the WSPR coordinated beacon project may forked your software to do something like this, but I'm not quite sure. 73, Robert, VA3ROM