Motorola PRO7550, User Manual

Page: 35 / 70

35
English
RADIO CALLS (
T
RUNKED
Trunked Modes
• If you hear a busy signal (a low-frequency “bah-
bah-bah-bah”), release the PTT switch and wait
for a call-back tone (sounds like “di-di-dit”).
When you hear the call-back tone you will have
three seconds to press the PTT switch. This
allows you to make another call without getting a
busy signal.
• If a continuous talk-prohibit tone is heard when
the PTT switch is pressed, transmission is not
possible. The radio may be out of range.
Low-Battery Alert
Your radio emits an alert tone when a low-battery
condition is detected.
Coded Squelch Operation
Tone Private-Line® (PL), Digital Private-Line™ (DPL),
and carrier squelch operation are all available in your
radio, on a per-mode basis.
When in carrier squelch operation, all traffic on the
mode is heard. When in PL or DPL operation, your
radio responds to only those messages intended for
you. When this feature is mode-slaved, PL, DPL, or
carrier squelch is programmed to each mode.
Whenever the radio is operating in carrier squelch, the
display will show
C
.
Variable RF Power Level (Selected Models
Only)
Radios can have more than one power level. High
power can be programmed on modes where high
power is permitted, and low power can be
programmed on all other modes. The high-/low-power
feature can be selected via the menu keys.
FAILSOFT OPERATION (TRUNKED
SYSTEMS ONLY)
The “failsoft” system ensures continual radio
communications capability during a trunked system
failure. Your radio will automatically go into failsoft
operation, if the central trunking controller fails for
any reason. While in failsoft operation, your radio will
transmit and receive on a predetermined frequency
1
Turn the radio on and select the desired
trunked zone and mode (see
Selecting a
Zone and Mode).
2 Press and hold the PTT switch on the side
of the radio and speak slowly and clearly
into the microphone area. The red LED
lights when the radio is transmitting. When
you have finished talking, release the PTT
switch to listen.