Operating Manual Part 15

4-8 5300 ES Series Mobile Radio Operating Manual October 2008
Radio Wide Features
4.11 Public Address
This feature allows a single microphone to be used for either radio or public address. An
external public address system can be connected to pin 7 of the radio accessory pigtail
cable. This is a low level output, so some sort of PA amplifier is required. The External PA
option switch (or menu selection) control this feature.
In the public address mode, microphone audio is always routed to the PA system, and the
radio can be programmed so that receive audio is also routed. When the PA is enabled/
disabled, “EXT PA ON/OFF” is displayed momentarily. The radio can also be
programmed to display “EXT PA ON” continuously.
If “Ext PA Mute” is enabled by PC Configure, when the radio code toggles the external PA
mute line, the auxiliary B output line will also be toggled. This allows users to mute their
own PA at the same time that the radio throws the eternal PA switch.
4.12 Scanning
Scanning monitors the channels in the scan list for messages the radio is programmed to
receive. When a message is detected, scanning stops and the message is received. Shortly
after the message is complete, scanning resumes.
If the microphone off-hook condition is detected (Hangup Box Monitor selected by
programming), scanning stops and selective squelch (such as Call Guard CTCSS or NAC/
group ID detect) is disabled on conventional channels. If the microphone off-hook
condition is not detected (Hangup Box Monitor is not programmed), taking the
microphone off-hook has no affect on radio operation. When a call is received in the scan
mode, the alias of the channel on which a call is received (and any other display
parameters that may be programmed) are displayed until scanning resumes. The selected
channel alias is then displayed if applicable.
There are two scan modes available: Priority (standard) and Radio Wide. The operation of
the priority type is unique to the system type programmed on the selected channel, and the
operation of the Radio Wide type is the same regardless of the system type programmed
on the selected channel. Only one type of scanning can be enabled at a time. For example,
if priority scanning is enabled and Radio Wide Scan is enabled, priority scanning is
automatically disabled and vice versa. Refer to the following for more information.