Frequency counter HELP !?

[Sonwatcher]

I just got a used freq. counter. I know the jumper from the back of the radio goes into the front of the counter but do I place anything on the connector in the back of counter? It is marked-External input. This is a Hickok 380.

Thanks,

Ron


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[Rylos1]

I can't help you with the question, but try posting it in the meters and test equipment section.


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