Table 2-5. Electronic Siren Controls
Twin Agent 4x4 Firefighting Truck
(Refer to Figure 2-5)
Control or Indicator
The Siren/Public Address System provides three siren signals with manual
or automatic operation and PA system and amplifier to direct personnel
outside of the cab.
The Manual Pushbutton operates the electronic siren in the manual op-
eration mode. The push button has no effect when the selector switch is in
It produces the WAIL tone when the selector switch is in STANDBY.
It produces the YELP tone when the selector switch is in WAIL.
It has no effect when the selector switch is in YELP.
It produces the YELP tone when the selector switch is in HI-LO.
The Selector Switch is a five-position rotary switch used to select the
mode of operation. The following are the positions on the Selector Switch.
RADIO. In this position, incoming radio messages are amplified by the
siren and rebroadcast over the external speaker. Siren tones (WAIL,
YELP, HI-LO) do not operate in this position.
STANDBY. In this position, it is possible to operate the siren by activating
the manual pushbutton. A WAIL tone will be produced using the manual