Hi,
Your write up is pretty cool. The fact that you get noise when you connect an antenna is Hugh. Means most things work.?
Other than encouraging you to start at the antenna and work your way back, I have no idea. I would suggest checking that all the frequencies used in the various mixer stages are what you are expecting. If you use a unmodulated test signal you should be able to tune across that frequency and hear the beat note go from high to low then high again.?
Try a nearby AM station if one is around and test against that.
Farhan is likely not bothered at all about someone making a learning project out of his design.
Tom, wb6b
