The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

I am having a transmit problem with my 520d, I have good receive and I hear voice when I switch over to the PA function so I know I have good audio. When I key up on AM the mechanical relay switches over and the transmit red light comes on, but there is no meter swing, and my dummy load does not light, so there is obviously no output. When I switch to either USB or LSB and try to transmit, the mechanical relay chatters.

Any suggestions? Thanks!

Hi matey...try this...




The AM regulator 2SC1419 is WEAK. UNSOLDER it and toss it in the trash.
Replace it with a GE-66, ECG-152 or a NTE-152.
Relay buzzes on SSB, no am transmit, lights go dim, or the fuse pops sometimes?
Replace C179 ( a 2.2uF 25v tantalum cap located near finals) with a standard 2.2uF electrolytic capacitor.


PAY ATTENTION to the "+" and "-"!!!