Just got back from retuning the cans at the 146.850 machine in muncie.
Very interesting. The machine has been pretty limited in range for
years, and I expected that the cans would be off, but never how FAR
they were off.. If the pass and notch weren't so flat and ragged, I
would have thought they were tuned for a different pair! The notch
on the receive, if I can believe my eyes, was on the wrong side of
the pass! I had previosly replaced the cables between the radios
and the cans, but I didn't expect it to make that large a
difference. Still, I hadn't measured the cans before I started, so
maybe they were just that bad or nearly so to start with... I don't
have a service monitor, my Tek 7L14 and tracking generator is not all
that portable, but I didn't buy it for portability.
They are now dialed in pretty well, at least as well as I can do with
my tracking generator and analyzer. I didn't hear any desense when I
enabled the transmitter, so I guess that will do for now. All the
cables are new, half-wave runs of LMR-400. I have a local source now
for FSJ1-50, and the appropriate connectors, so I'll be going up
again when those are in hand.
It's a nice feeling to take an old neglected machine, and get it back
in shape again.
Given the site and antenna, I'd say we are doing pretty well, judging
by signal reports and some drive tests tonight.
:)
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