That seems reasonable enough. I've yet to find a radio (or band) that I could use to run something continuously like that. Seems it would eventually eat PAs. Like trunked control channel repeaters occasionally do.
Dennis Mills, WB6OIL (SK) engineered a system somewhat like this. It was very unique in that the remote sites were MSF 5000s that received on 443MHz and transmitted on 439MHz. They had a several second hangtime to them and during that hangtime generated 2175Hz over the air. Once the hangtime ran out, the SpectraTAC link receiver at the comparator site would take over the 2175Hz generation into the comparator. There was an ever so slight "tick" when the remote site unkeyed. It worked EXTREMELY well.
I ended up with the comparator and link receivers from that system in a round-about manner when it was decommissioned. Never was able to lay hands on any of the specially-modified MSF 5000 stations though. Man that thing worked well, had a phone patch and everything. Some day I'd like to put it back together.
Transmit site, as I understand it was a 250W MICOR, by the way.
Chris
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Chris Baldwin, CETSr. (KF6AJM)
Trustee - MetroNET Cal. Intertie (KB3PX)
Chris Baldwin