[R-390] frequency counter

[Kenneth]

I have one of the long discontinued RadioShack frequency counters. It works
quite well except it's a battery hog.  I want to use it to work on the IF/RF
module.  I need some information on building a test lead for this counter.
It has a Hi-Z switch on it but the documentation for making up the cord is
really lacking.

                       Ken de W7ITC