Jerry,
I agree with what you have written and detailed. The transmit spur varies with frequency. Away from 7.2MHz it is outside of the band. Feeding the Raduino into the disabled vfo is not optimal as regards signal purity.
The start of this thread was a suggestion that the Bitx40 might be easier to get fcc compliant. Being single band that might be true but it is not without its own problems. There has been little reported on the Bitx40 since the uBitx was released.
Brian VK4BAP
