If its denying a transmission then its doing its job, its not supposed to allow someone else to key up if there is an active open channel.I'm glad they are testing. I hope they run it through its paces before Fire switches over. Im already getting too many transmission denials or or transmissions dropping out on portables and mobiles. This would not be a good thing if a firefighter is on a trunked channel calling a mayday.
The fire line up for the county has been out for a while, not necessarily any talkgroups for specific uses or departments that I am aware of.