Easy Fix,
Get better duplexers, TX/RX are a good start.
Takes mansize cans to support a preamp. TX/RX duplexers will provide the
channel separation you will need for a preamp,
but you still need a selective receiver to go with it. I believe the
Mitrek has the selectivity you need.
Also while I'm on it, your common ham preamp will probably not give you
the performance you are looking for.
Not only will it amplify the signal, but also amplifies the noise floor.
In my years of search for the perfect preamp, I discovered the only good
one says Motorola on it. You don't need 30 db, just 6 or so
to greatly increase performance.
Also change the antenna, the little connection in the GP-9 antenna that
holds the different sections together is a
prime candidate for static desense. The connector will suffer from
corrosion within weeks after you put it up.
It's not noticeable to the naked eye, but it is there.
Buy yourself a good commercial grade antenna, DB products for instance.
Look at it this way, you'll change that GP-9 antenna at a minimum of yearly.
After about 4 years you'll have had a new DB products antenna paid for.
In closing, sounds like you are concerned how your repeater receives,
you are to be commended,
many hams just want their repeater to broadcast as far as it can and who
cares how it receives.
All the above suggestions I have made to you, are all mistakes I have
made, and learned from.
Don KI0EO
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