[TenTec] ALC circuit on the Corsair I

[Donnie Garrett]

Pete:
Did you first check for damaged diodes D1 & D2 on the SWR board? That may be your ALC problem.

Donnie / WA9TGT

Sent from my iPhone

On Feb 9, 2013, at 1:25 PM, Mike Bryce <prosolar at sssnet.com> wrote:

> Pete,
> 
> did you follow the adjustment procedure in the manual?
> 
> the ALC is set by both the front panel control and ALC trimmer on the LLdriver. 
> 
> Mike
> 
> 
> 
> On Feb 8, 2013, at 8:44 PM, N6QW wrote:
> 
>> Looking for someone who knows and understands the innards and outards  of the TT Corsair I ALC circuit. 
>> 
>> On the Corsair I, I am refurbishing, The ALC controls do not seem to function. At first I thought it might be a circuit problem with the ALC circuit devices and replaced all of them. Same issue. The ALC barely lights when you adjust R11 and R15 has no effect at reducing the power. I temporarily put an LED on the ALC board connector as can get that to dim.brighten with an adjustment of the panel mounted ALC control but not as it should as that is for very low power levels as controlled by the Drive control --and the panel LED is really dim. 
>> 
>> At low power levels the temporary LED will come on when you key the MIC but dims on voice peaks which is the reverse of what it should do. I measured the voltages on all of the devices Q4-Q9 and the values are close to what the TT manual says they should be -- so nothing there.
>> 
>> Any one have any suggestions or clues on how to fix the ALC. Rather than clog up the reflector please reply directly to radioguy90 at hotmail.com
>> 
>> 73's
>> Pete N6QW
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