Thanks to Phil,Barry,Bob and all others that have been helping with the audio
problem on corsair ll. I changed the resistor to 100k,th en 220k .After each
change the ALC light flickered
with less drive,but audio had no change. Recieved card from station that made
me aware of problem. In the remarks h e said it also was distorted. What a can
of worms. Am going to set it on the shelf for a week then get back to it. Maby
the headache will subside. For now I'll use my paragon and be thankful I have
it. Thanks to everyone this has been a good learning experence.
de nf4r Dave Hope this goes to the right place.
----- Original Message -----
From: "Phil Chambley, Sr." <k4dpk@comcast.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Monday, March 25, 2013 8:43:43 PM
Subject: Re: [TenTec] Need help with corsair ii
On 3/25/2013 8:22 PM, nf4r@comcast.net wrote:
>
> Looked at schematic for audio processor and u2a only has pin 1-4,however
> there is a 15k between pin 1 and 2 of u2a. The chip info in my manual shows
> a dot to indicate pin 1.
>
> 1> 8 > is dot. Is this the right one?
>
> 2 7
>
> 3 6
>
> 4 5
> de nf4r
>
>
> ----- Original Message -----
>
>
> From: "Phil Chambley, Sr." <k4dpk@comcast.net>
> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
> Sent: Monday, March 25, 2013 1:35:58 PM
> Subject: Re: [TenTec] Need help with corsair ii
>
> *I think R68, at 15k ohms, is holding the first mic amp gain down n the
> Corsair.
>
> If I recall correctly, I have in the past changed this resistor to*
> *around 220k-330k to bring the gain up. The Paragon has a 470k in that
> position.
> In the Corsair, that resistor is between pins 6 and 7 of U2A
> *
>> **
> *Phil C. Sr.
> k4dpk*
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Dave
I think so. You can be certain by checking if pin three goes to the mic
input through a 1 uf capacitor and 106.8k of resistance.
Ten Tec frequently showed one half of an IC being used when it was in
fact the other half in the circuit.
Phil C. Sr.
k4dpk
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