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🔴 #811 Racal-Dana 2101 Microwave Frequency Counter Repair


I repair a Racal-Dana 2101 Microwave Frequency Counter, the 20GHz 2101 frequency counter is working on Input A, and Input B, but Input C isn’t working.

I do some testing of the Local Oscillator module to see if the down converter system is working, and find it is very noisy, I then dig deeper to find out why the PLL / VCO is so unstable.

– Serial Number B01

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