9COM Fire Departments: You may have noticed that fire tones on VHF have a new, brief addition at the beginning.
BRICS is testing the addition of a ~1 second verification tone at the beginning of each tone sequence generated by the 9COM dispatch center. This verification tone will give a “loop back” confirmation to the center that the dispatch successfully launched over the air.
The tones you’re used to begin immediately on 800MHz, and around a second later on VHF. If you’re listening to both simultaneously, you’ll hear them offset a bit. It all syncs back up when the voice announcement begins.