DAK 10- Suddenly Stopped Modulating

[Lik2race]

Hey Guys, Need a little help.
My DAK 10 just suddenly stopped modulating. I changed mics just to see.
That didn't work. I changed radios to doublecheck my system, second
radio worked fine with the first mic. Any idea on where I should start
looking ? Be gentle..Old Dumb Guy looking for a knowledgeable problem
solver.
Thanks,
Stan aka Lik2race
Email is :[e-mail]

[29va]

The radio still keying up?

[Sandbagger]

Aug 6, 2010 11:29:16 GMT -5 Lik2race said:

Hey Guys, Need a little help.
My DAK 10 just suddenly stopped modulating. I changed mics just to see.
That didn't work. I changed radios to doublecheck my system, second
radio worked fine with the first mic. Any idea on where I should start
looking ? Be gentle..Old Dumb Guy looking for a knowledgeable problem
solver.
Thanks,
Stan aka Lik2race
Email is :[e-mail]

Well, I'll be as gentle as I can. The DAK 10 was not designed to handle the heat generated by the modulator transistors, with anything more than stock (80%) modulation. If you've opened up the limiters or had the radio "peaked" in any way, it's not a matter of if, it's a matter of when, those transistors will pop. So I suspect that is what is wrong with yours.

Does it still modulate on SSB? If so, then I would definitely consider the output modulator stage transistors. If no output on SSB as well, then it could be something in the lower level audio stages or a broken wire inside the mic jack.

[Lik2race]

Thanks Guys for the info..
I'll do some checking as you suggested.