I service a public safety repeater. It's a master II.
About 6-8 months ago I rebuilt the PA, replacing the two output transistors,
caps, etc... I even added a couple of fans and it's been working great at
around 40 watts.
Lately we have been having some trouble which has been nicely termed the
whale noise. After dispatch would transmit via a wire line, very
infrequently we would have a noise come through or cover their
transmissions.
Yesterday I checked everything and found I was getting some desense, around
8db.
I looked at the duplexer and it looks like it has not been touched in around
25 years. The shafts are rusty, cables look very fragile.
So, I decided not to try and retune it because I feel something inside may
snap and I'd be worse off then I am now. So I adjusted the transmit power
down to 25 watts and no desense.
We are planning to replace the radio system in the next year, so I don't'
really want to invest in a new duplexer.
What do you guys think?
-Tim
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