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Good question, although I am familiar with the option and one agency I consult for is currently looking into this option merely for the ptt id aspect, although Not one of Motorola's top selling points, is one of the BEST options available in the Fireground package.
Where everyone else is used to the "beeeeeeeep" upon press of the PTT (which is the id being sent), the f/g option in the xts radios offers a "quick digital packet" which transmits the unique id of the radio (up to 8 characters long) and then the radio opens up the mic to TX analog for Fireground communications.
I just wanted to mention all of the above in case anyone reading the post at this point in not familiar with Motorola’s Fireground operation.
Anyhow, trying to answer your question, I am not sure. Theoretically if you have a digital capable subscriber unit in vicinity of the "location", and having that radio's RX rule set to Mixed-Mode, you might be able to rx the id's AND the analog audio. There might however be some issues with older host/dsp and "straight through" receive when the carrier switches from digital to analog. Also, I'm not sure if the carrier drops for a few ms during the transition from dig to analog.
This is an interesting post. Maybe along the lines for some of the astro pros on batlabs.com
Anyone care to chime in?
Furthermore, If anyone wants to read some release literature on the Fireground Communications Package, feel free to email me at
ALLPLOWEDOUT@OPTONLINE.NET and put motorola fireground in the subject line and I will gladly email you a few PDF files.