E.F. Johnson Company 53SL ES Series, Руководство по эксплуатации

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53SL ES Series Mobile Radio Operating Manual April 2009 5-7
Surveillance Mode Section 5 - Radio Wide Features
Conventional Channel Selected - Scanning temporarily halts (if applicable) and the
Monitor Mode described in Section 6.2 is enabled. However, the receiver unsquelches
only if a carrier is detected.
SMARTNET/SmartZone/P25 Trunked Channel Selected - Scanning temporarily
halts if applicable.
If the off-hook condition is not detected (Hangup Box Monitor not selected), the
microphone hook state has no affect on radio operation.
5.10 Surveillance Mode
If the Surveillance mode is programmed, the backlight, all alert tones, and front panel
LED indicator can be disabled individually or totally, based on programming.
The transmit/receive LED indicator, display and keypad backlight, and all alert tones can
be disabled. When setting is enabled, the radio will power up in Surveillance mode with
the selected options active. A function button can also be assigned which will activate and
deactivate surveillance mode at the user’s discretion. It overrides any other programming
of these functions such as a Tone or Backlight option switch.
This feature can be turned ON and OFF via menu selection or by the user if the SURVLC
option switch (if programmed). The user selected mode permanently overrides the
programmed mode if applicable.
5.11 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.