Author Topic: ft-901dm ham radio repair.  (Read 493 times)

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Offline drforbin

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ft-901dm ham radio repair.
« on: December 08, 2015, 02:02:40 pm »
Hi guys. I don't know if this is the proper place to ask for help related to ham radio repair, but I thought I'd try anyway.

I am currently trying to repair a ft-901dm ham radio.
I'm having problems if transmitter power output.
When turned up on 160, 80,20 I'm getting close to full power on 20m I'm getting only 10 watts.
I tracked it down to ALC circuit (this   circuit is pretty simple. If anyone wants schematics I can provide them) It seems that on some bands, 20m in particular the ALC is preventing the PA from reaching full power. I tested all the caps and traced the circuit, even going as far as changing most of the caps associated with the ALC. NO good. I really cannot figure out whats going on. I really need some help or suggests to put me on a new path.

Ok thank you all for reading.

any suggestions will be welcome.


PS. I have neutralized the tubes.


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