I had to learn a lot about the IF Board on the road to final diagnosing my SSB low power out problem.
IF Board Q403 description lies. It does not amplify the DSB signal coming from the AF Board.
The gain of the weird JFET circuit Q403 is about .3 unity gain.
The circuit is a buffer/impedance matching circuit.
Also, the IF Board schematic has 2 major errors.
Is there an Yeasu internal doc that shows ANY levels on board pins?
Yeasu seem to be devoid of any levels in their docs.
