E F Johnson Company 2425372 用户手册
Draft
-6 5300 ES Series Mobile Radio Operating Manual
December 2006
4.8
Microphone Off-Hook Detect
The microphone hanger can be connected to chassis ground and the radio programmed to
detect an off-hook condition (Hangup Box Monitor selected). The following operation
then occurs when the microphone is taken off-hook:
detect an off-hook condition (Hangup Box Monitor selected). The following operation
then occurs when the microphone is taken off-hook:
Conventional Channel Selected - Scanning temporarily halts (if applicable) and the
Monitor Mode described in Section 5.2 is enabled. However, the receiver unsquelches
only if a carrier is detected.
Monitor Mode described in Section 5.2 is enabled. However, the receiver unsquelches
only if a carrier is detected.
SMARTNET/SmartZone/P25 Trunked Channel Selected - Scanning temporarily
halts if applicable.
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.
microphone hook state has no affect on radio operation.
4.9
Surveillance Mode
If the Surveillance mode is programmed, the backlight, all alert tones, and front panel
LED indicator are totally disabled in all operating modes.
LED indicator are totally disabled in all operating modes.
This feature can be turned on and off by the user if the SURVLC option switch is
programmed. The user selected mode permanently overrides the programmed mode if
applicable.
programmed. The user selected mode permanently overrides the programmed mode if
applicable.
4.10 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 is required to control this feature.
cable. This is a low level output, so some sort of PA amplifier is required. The External PA
option switch is required to 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.
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.
4.11 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 (unless it has been disabled).
receive. When a message is detected, scanning stops and the message is received. Shortly
after the message is complete, scanning resumes (unless it has been disabled).