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Dave,

Here's my suggestion.  You need to have some receiver test equipment to
really test the system, but you could troubleshoot according to what I
said before.

1.  Eliminate the cable as the bad component by buying a premade length
of cable.  You can either buy an off the shelf, or have a cable made.

2.  I would suggest that you make or buy the cable that is at least 10
inches longer or shorter.  Sometimes the length of the antenna cable can
be a bad thing.  It's known as a mismatch.

3.  If the cabel thing doesn't work, hook another antenna to the
installed cable.  If it works fine, replace the installed antenna with
the new one.  If it doesn't work, hook the new antenna to the new cable
and see it that works.

4.  If steps 1 thru 3 don't indicate the bad component, replace the nav
radio with a known good one.

You essentially have three components in the system, the antenna, the
cable, and the radio.  Use the process of elimination to find the bad
component.  Sometimes a bad connection can't be found via the human
eye.  Another idea would be to find a local ham radio shop and see if a
local ham might be willing to help you.

Good luck.
Curtis
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