I have no output rf when transmitting in SSB mode regardless of freq. It receives SSB fine. Regarding AM…transmits fine…power ok and modulation ok too. In working through the schematics/docs it looked to me like the SSB generation circuitry
is on the underside of one of the boards and cannot be accessed unless the board is removed…was attempting to troubleshoot with a scope but was stopped there. Besides the zebra display its been a great rig…used it motorcycle mobile (2m) for a number of years.
The FT857 has a signal path for SSB that is different from the CW and FM. Part is shared with the AM. Does the radio receive and transmit on AM?
For that matter does it receive on SSB and not transmit or the reverse or are both inop perhaps along with AM as well?
The signal tracing is not too difficult, but as I remember the circuit board needs to be removed to get the the common amplifier etc.?
The difference in the AM and FM is the unbalancing of the balanced modulator and the use of a ceramic filter for AM vs the crystal filter for SSB.
