Draft 02 - Sep 1 2015
Viking Mobile Radio Operating Manual
4-7
Radio Wide Features
4.7
Ignition Power Down Duration
The radio can be installed so that the vehicle ignition switch as well as the front panel
power switch of the radio control power. This is done by connecting the accessory cable
ignition switch input to the vehicle ignition switch. Refer to the
Viking Mobile Radio
Installation Manual
for more information. A Power Down Duration of up to 1,440
minutes can then be programmed, or this feature can be disabled by programming
“Infinite” delay so that 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 ignition switch back ON.
This power down delay can allow calls to be received or the horn alert to be active for a
time after the ignition switch is turned OFF. At the same time, advantages of ignition
switch control are used such as preventing the battery discharge that may occur if the radio
is left ON for an extended period.
4.8
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
Viking Mobile Radio Installation Guide
for more information on how to install this
feature.
Additional information on the horn alert feature follows:
• It activates when receiving any Unit Call or Call Alert in the P25 conventional,
SMARTNET/SmartZone, and P25 Trunking 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 down duration 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 to 255 seconds. It then turns OFF until another Unit call or Call alert
is received.
