Telewave.com lists 3 models of the PM-2A, all bidirectional, rated for 1000 watts.PM-2A-50 covers 30-88 MHz , the -300 suffix is for 118-512 MHz , and the -900 covers 806 -960 .Evidently any model is available with either UHF (so-239) or "N" connectors, but if there's no suffix,I'd wager if you have so-239s ,it'd be low band,and if it has "N" connectors ,it's likely the UHF meter.Unless it fell off a cellphone truck,it's probably not the 900 MHz one.The best test is to try it (at fairly low power) and see what works.Bird is at
www.bird-electronic.com . Their website works poorly with Netscape , much better with Internet Explorer.
Russ,WA5EE