RADIOWIDE FEATURES
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programming “Forever” so there is no automatic
power off.
Both the ignition switch and the power switch
must then be on for radio power to turn on. The delay
can be overridden at any time by turning power off
using the front panel power switch or turning the igni-
tion switch back on.
This turn-off delay can allow calls to be received
or the horn alert to be active for a time after the igni-
tion switch is turned off. At the same time, advantages
of ignition switch control are utilized such as
preventing the battery discharge that may occur if the
radio is left on for an extended period (see
Section 7.5).
4.7 HORN ALERT
The horn alert feature* sounds an external alert
such as the vehicle horn when certain calls are
received. It is available if a Horn option switch is
programmed and the proper connection has been made
to the external alert. The horn alert output is pin 4 of
the accessory cable, and an external driver circuit of
some type is usually required. Refer to the Installation
section of the 5300 Service Manual for more informa-
tion on how to install this feature.
Additional information on the horn alert feature
follows:
•
It activates when receiving any Unit call in the
conventional mode and any Private/Unit and Call
Alert (paging) call in the SMARTNET/SmartZone
and P25 Trunked modes. It does not sound when
receiving standard Group or telephone calls, and is
not programmable on a per call basis.
•
It must be manually enabled and disabled by the
Horn option switch. It is not controlled by the
vehicle ignition switch. When it is enabled, “HORN
ON” is briefly displayed, and when it is disabled,
“HORN OFF” is briefly displayed. It defaults to the
off mode whenever power is turned on.
•
If a power turn-off delay is programmed as just
described, it is functional during that delay.
•
When activated, it can be programmed to sound for
three 1-second beeps or continuously for 2-90
seconds. It then turns off until another call is
received.
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 micro-
phone is taken off-hook:
Conventional Channel Selected - Scanning tempo-
rarily halts (if applicable) and the Monitor Mode
described in Section 5.3 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.
4.9 SURVEILLANCE MODE
If the Surveillance mode** is programmed, the
backlight, all alert tones, and front panel LED indi-
cator 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. (
This feature is avail-
able only with firmware 1.22/2.0/3.0 or later and
PCConfigure 1.20 or later.)
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.
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.
**
This feature requires 5300 operating (ARM) soft-
ware 1.16 or later (or 2.0/3.0 or later).
*
This feature requires 5300 operating (ARM) software
1.19 or later (or 2.0/3.0 or later).
