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No I can't help with the squelch thing, make sure PL/DPL matches what your transmitting, and get it set for a split pair, preferably 5MHz difference between Tx/Rx. Also get the duplexer tuned for the pair. The higher of the two frequencies goes to the highpass port, the lower to the lowpass port antenna in the antenna port. First apply for a license, Once you know the pair you are going to be using, get the duplexer tuned(VERY IMPORTANT) if not you WILL burn out the PA in the transmit radio and the reciever WILL be deaf. After all that is out of the way program the radios THEN after everything is tuned and hokked up, do a function test before you install the repeater. Also use double shielded coax for jumpersbetween radios and duplexer and hardline for the run from the duplexer to the antenna. Anything less is going to create problems and frustration for you. Absolutly no LMR400 coax.
Interoperatablity is not a technology it is an attitude!!!