Many Yaesu FT-747GX/FT-80C presents this fault. But it is very easy to repair.
On the PA output transistors base to colector, there are R17 and R18.
Cut the tracks betwen the transistors base and these resistors and install a little coil wound about 5 or more turs over a 100K resistor.
It will cure the PA oscillation.
This Mod Provided by:
PY8ELO
73
Jeff
On the PA output transistors base to colector, there are R17 and R18.
Cut the tracks betwen the transistors base and these resistors and install a little coil wound about 5 or more turs over a 100K resistor.
It will cure the PA oscillation.
This Mod Provided by:
PY8ELO
73
Jeff
