I've been having some difficulties with the clarity of the signal out of my BITX 20 from ages ago:
When I placed the unit back under test I found that the carrier suppression was as expected when the VFO was at the top of the band, but when it was elsewhere the carrier suppression was non existent. Now a quick look at the schematic will tell you that this simply isn't possible, however this video shows that it is:
Now, I've got the main board out of the box again and back under test on the bench:
Also the 14Mhz signal out of the exciter on this board looks clean enough on the scope and also on the spectrum analyser:
So tomorrow, I'm planning to re-do the internal wiring testing each stage as I go.
Damn cats haven't been helping much either:
Fun though, egh?