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Re: SR2000 Cant Null carrier


 

Clark,

Any chance this unwanted carrier is an audio chain issue??

73
wa3gin

On Tue, Apr 2, 2024 at 7:33?PM W7WRX <clark@...> wrote:

Thank you for the suggestion.? The radio was working and done.? It then just the next day all the sudden had the carrier.? The trimmer was in fact bad and according to Walt's guide, this is common.

I have had this problem several times now on various rigs.? The Invader 2000 had this issue and only after I shot gunned the ENTIRE circuit, Resistors, trimmers, Diodes and caps, Did it start working again. The resistors did go way up in value.

Also had this problem with my Collins S line. The 32S3C had 1 watt of carrier.? I replaced the odd diode bridge with 4 1n5711s and I added a small ceramic cap and bingo it nulled.?

I found the exact model NPO trimmers on Ebay. I ordered 5.? Its going to be a week down time. They are in New Hampshire. Just about as far as you could possibly get from my QTH.

When they get here, I will get some new small hardware and install the trimmer. It will look like factory.? I will replace ALL of it.? Every part so it is all NEW.? ?Then, Cross my fingers and key it up.??

These things have not been on and used in maybe 40 years. They have put up a hell of a fight.? But they will both be expertly repaired and work better than new when I am complete. It's just going to take more time.

C

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