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Re: [TenTec] ALC circuit on the Corsair I

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] ALC circuit on the Corsair I
From: Donnie Garrett <cfzepp@gmail.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 12 Feb 2013 12:55:28 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Pete:
Glad I was able to help!

Donnie / WA9TGT

Sent from my iPhone

On Feb 11, 2013, at 7:20 PM, "N6QW" <n6qw@jessystems.com> wrote:

> Hi Donnie,
> 
> Yep that was the problem --all is well now.
> 
> Thanks for your email and suggestion.
> 
> 73's
> Pete N6QW
> 
> --------------------------------------------------
> From: "Donnie Garrett" <cfzepp@gmail.com>
> Sent: Sunday, February 10, 2013 10:26 AM
> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
> Subject: Re: [TenTec] ALC circuit on the Corsair I
> 
>> 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@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@hotmail.com
>>>> 
>>>> 73's
>>>> Pete N6QW
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>>> 
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