sethcwilliams wrote:It happened on almost every system as we moved them from 25 kHz channel spacing to 12.5 kHz.
Scratch that last sentence. I'm an idiot sometimes but that's nothing new. What was actually happening was changing the settings in "Zone Channel Assignments" from "5kHz and 25kHz" to "2.5kHz and 12.5kHz". Turns out (I just figured this out), when running an ASTRO system with C4FM or CQPSK as the modulation type, you're already transmitting with 2.5kHz deviation and 12.5kHz channel spacing regardless of the settings under "Zone Channel Assignments". I talked to another gentlemen in this forum who told me those settings, when tranmitting with digital modulation, only served to prime the receiver IF to receive wideband broadcast from analog radios while operating in mixed mode.
Long story short, changing the "Zone Channel Assignments" setting from "5kHz and 25kHz" to "2.5kHz and 12.5kHz" caused us to receive 09/10 errors from the UCM on a large percentage of radios. My expirience was specifically with XTS-5000s so I can't really speak to issues with other radio models. Either way, the updated host and dsp firmware resolved the problem.