TM5-42 10-229-1 4&P
2-13. OPERATION OF SIREN/PUBLIC ADDRESS SYSTEM.
The siren/public address system provides three siren signals with manual or automatic operation and a PA system
and external speaker to direct personnel outside the cab. Operation of the system is as follows:
Do not turn on siren amplifier unless front mounted speaker siren wires are connected.
Rotate ON/OFF PA volume control knob (3, figure 2-5) clockwise to activate siren/public address system.
Further rotation of the knob increases voice volume when the amplifier is used for PA or radio amplification.
The control knob does not control siren volume.
For siren operation, select desired tone on selector switch (2, figure 2-5). The selector switch has five posi-
RADIO. In this position, incoming radio messages are amplified by the siren and rebroadcast over the
external speakers. 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 pushbutton.
WAIL. In this position, the siren produces a continuous WAILING sound up and down in frequency.
Depressing the manual pushbutton will produce the YELP tone.
YELP. In this position, a continuous rapid warbled tone is generated. Depressing the manual pushbut-
ton will have no effect.
HI-LO. In this position, a two-tone sound will be heard. Depressing the manual pushbutton will produce
the YELP tone. The pushbutton has no effect when the selector switch (2) is in RADIO.
The manual pushbutton (1, figure 2-5) operates the electronic siren in the manual operation mode. The push
button has no effect when the selector switch (2) is in RADIO.
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.
2-14. OPERATION OF THE INVERTER.
The inverter designed to provide 120 volt, 60 Hz AC power from the DC output of the 12 volt vehicle electrical
system to operate all tools, lights, and receptacles as required in various firefighting operations. The inverter oper-
ating controls are located on the instrument panel (20, figure 2-4), and on the inverter.