As mam1081 mentioned, for each site PSO has, every single frequency they own is attributed to that site. Why?
Sloppy/lazy application processor? Convenience of swapping frequencies? Who knows!

Even though PSO is an awful mess, is not impossible to figure out.
To rehash mam1081 .. plug all of the frequencies into a bank and start scanning. Make note of which ones are control channels and lock them out. The goal here is to find out which ones are in use for voice. Once those are known, then we can start working on determining LCN's. That is the hard part. eTrunker and UniTrunker will help make the job easier, but it does require two radios and listening time. One to decode the control channel and the other to monitor voice so as to match it up to an LCN.
Fish some frequencies out first and we'll go from there!
