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F3021 scrambler, problem and solution

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Premium Subscriber
May 28, 2012
Westfield, Ma
I installed a UT-110R scrambler board in a F3021 today. I have done this several times before with no issues.

This time, It would scramble encode but not scramble decode.

I took the module out and looked at my work at cutting the two required traces. I was using a magnifying headpiece. It looked good but I ran an X-acto blade thru them both again. Put the module in and... same problem.

I tried another scrambler module... no different.... still no receive unscramble function.

I pulled the second one out, ran the X-acto blade thru the "DISC" jumper several more times, removing any sign of even the ends of the jumper completely.

I put the first module back in and all was good.

The "DISC" jumper (used for receive) is sort of hidden under the radio frame and harder to see than the "MIC" jumper.

So, if either transmit or receive scramble function doesn't work after installation, triple-check the MIC or DISC jumper cuts.


WA1NIC, WQAV-895, WPIH-815, PG0111912
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