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PA oscillation in The Yaesu FT-747/FT-80C

AudioShockwav

Extraterrestrial
Staff member
Apr 6, 2005
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Sierras Near Yosemite National Park
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
 
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Djarot

Member
Feb 15, 2015
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Thanks Jeff, I have the same problem on the YAESU FT 80C, I have tried, and succeeded,

regards 73 de YB3FTD
 

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