Best way to do it is use a regular crossband type configuration at the receiver site. For example, VHF receiver hooked up to a UHF transmitter. Zero hangtime. At the voter site, use a UHF link receiver that generates the status tone to the comparator.
If aligned properly, it works fine. You should be using the same radios at each site for everything to keep audio characteristics as close as possible.
Chris
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Chris Baldwin, CETSr. (KF6AJM)
Trustee - MetroNET Cal. Intertie (KB3PX)
Chris Baldwin