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This is why I didn't go with the internal mobile duplexor.

There are no "allocations" by the FCC to prevent multiple repeaters in the same area on the same repeater pair. Part 95 simply defines 8 repeater pairs for GMRS. Two of them have geographical restrictions regarding proximity to Canada. As far as I know, there is no formal coordinator system in GMRS, at least certainly not authorized or required by the FCC who has the only legit jurisdiction in these matters. As Corey pointed out, GMRS repeater operators geographically close to each other tend to work these things out between themselves. Part 95 never grants exclusive rights to a frequency, in fact it's quite the opposite. GMRS users are required to share the channels. There is no exclusivity in most LMR services. Here's a link to an easy to read online version of Part 95. It should answer most of your questions. https://www.law.cornell.edu/cfr/text/47/part-95 There are many other resources for Part 95; do a google search using fcc part 95 and you'll get plenty of useful hits. Also, using the search function here on mygmrs.com will locate many previous discussions on the same topics.

Duplexer sounds out of tune. Is it a cavity style or mobile style? Sent from my SM-T350 using Tapatalk