Motorola B3 MTX Series Operating Instructions Manual page 23

13 Getting Started (cont.)
The indicator LED on top of the radio indicates radio operating conditions:
A. With the PTT switch pressed (radio transmitting)
Continuous red LED—normal transmission
LED unlit—radio is not transmitting
Blinking red light—low battery
B. With the PTT switch released (radio receiving)
Blinking red light—mode busy (conventional modes only)
Blinking green light—receipt of a telephone call, Private Conversation
call, or Call Alert page
The time-out timer feature limits the amount of time you can continuously
transmit on a mode. If you hold down the PTT switch longer than the allotted time:
a tone will be generated four seconds before termination of your
transmission to warn you that your conversation is about to be cut off.
your transmission is terminated and an alert tone is emitted until the
PTT switch is released.
Your MTX Series radio is capable of both trunked and conventional operation:
During trunked operation, your MTX Series radio offers
a number of advantages, including fast system access, enhanced privacy, and
ease of operation. In a trunked system, there is no need for you to monitor a
mode before transmitting.
During conventional operation, your MTX Series
radio performs like a conventional two-way radio. That is, you must monitor
the selected mode before transmitting. If the radio's red LED is blinking in the
receive mode, the channel is busy. As an option, the Smart PTT feature is
available via RSS programming. If the PTT switch is pressed and the channel
is busy, a continuous low-pitched tone will be heard. The tone will continue
until the PTT switch is released. This will ensure that you are observing
standard two-way radio transmission protocol by not "talking over" someone
who is already transmitting.
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