Cobra 1000 GTL Direct Injection?

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Dragon
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Cobra 1000 GTL Direct Injection?

Postby Dragon » Thu Jul 19, 2018 6:28 pm

Hello fellow forum members. What is the direct injection point on a Cobra 1000 GTL?, I have modified for HI-FI on Rec and Tx. All I need is the crucial point of injection thank you guys.
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Goldfinger
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Re: Cobra 1000 GTL Direct Injection?

Postby Goldfinger » Fri Jul 20, 2018 7:38 pm

The 1000 has the same problem as a 29ltd. The audio section is used both for transmit and receive. Because of this you will get feedback from the mic in receive mode. To remedy this you either have to find a way to switch off the line level audio from the mic during receive or inject before TR 15. To inject before TR 15, you would inject through a 4.7uF to the positive hole of C129, then change C127 to a 1uF or 2.2uF non-polarized electrolytic or mylar or polyester.

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Dragon
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Re: Cobra 1000 GTL Direct Injection?

Postby Dragon » Fri Jul 20, 2018 10:07 pm

Thank you, you are a Technical God amongst men.
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grasshopper
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Re: Cobra 1000 GTL Direct Injection?

Postby grasshopper » Sat Jul 21, 2018 9:24 pm

He dang sure is.

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