I modified the 1.05 Raduino sketch to monitor D7 and flip the state of the "isUSB" variable so that the tuning function would change the injection frequency to allow USB detection. The firmware change seems to work - i.e. I see the display show "USB" instead of "LSB", but the RX sensitivity dropped into the basement. The usual hiss was almost totally gone, and I could barely hear the birdies & QRN I normally hear.
Is this typical of using this method to listen to USB? If so, what is the preferred method? Changing the BFO oscillator?
