User`s guide

ASTRO XTL 5000 Digital Mobile Radio with W3 Control Head 23
Basic Radio Operation
Time-Out Timer
This feature limits the amount of time you can continuously transmit.
Your system manager can program the timer for up to 465 seconds at
15-second intervals. XTL 5000 radios are programmed at the factory
to time-out after 60 seconds.
Notes: You hear a low-pitched alert tone four seconds before your
transmission to about to expire.
If you hold down the PTT button longer than the programmed
time, you hear a continuous, low-pitched tone. This tone
ceases to sound when you release the PTT button.