Features
Built-in efficiency for lower cost and improved performance is provided in the Model PA300, which is available with 100 watt output, and the Model PA300MSC which is available with 58/100/200 watt output. Both are designed to drive a single high power speaker to a sound output level that meets Class "A" specifications.

A high degree of reliability is achieved through the use of integrated circuits and silicon output transistors providing improved performance and durability under a wide range of environmental conditions. A noise-canceling microphone is wired-in (to prevent loss or theft) producing high quality voice reproduction without feedback "squeal". The microphone push-to-talk switch overrides any siren signal for instant PA use. Radio and PA volume are adjustable by means of a front panel gain control, and the radio interconnect wires are built-in so there is no need to purchase additional cables.

The PA300 is protected against all failure modes (including reversed polarity) by a fuse that is replaceable without tools. The unit can operate from any 12-volt positive or negative ground vehicle electrical system. Power for the siren can be obtained from the vehicle's power distribution centre, or directly from the vehicle battery. There are no protruding components to interfere with mounting arrangements. Each siren comes equipped with a swing bracket which enables mounting in a variety of positions. Also available is a stainless steel bezel (model DSM) for flush mounting and mounting compatible switch packages (model SW400SS for control of up to six auxiliary circuits or model SW400SSJ for seven circuit control).

A wide range of features including all the basic siren tones, TAP II, PA, radio rebroadcast, as well as built-in air horn sound with siren override, are provided in a well-designed package. Field tested and proven for years, TAP II provides extremely effective traffic clearing capability at intersections. A front panel lever switch activates the electronic air horn or peak-and-hold on demand in any siren mode except radio.

Selector Switch Functions
RADIO – Incoming radio messages are amplified by the siren and rebroadcast over the outside speaker.
MANUAL – Siren may be activated by the horn/siren switch or by the vehicle's horn ring.
WAIL – Continuous "wailing" up and down in frequency.
YELP – Continuous rapid "warbled" tone.
HI-LO – Distinctive two-tone sound.
HORN/SIREN – Up position activates electronic air horn sound and down position activates peak-and-hold sound in any mode except radio.

TAP II Functions
The TAP II feature allows the driver to change the audible siren sound via the vehicle's horn ring, or any remotely mounted switch. The chart below demonstrates how the horn ring circuit may be used to change the siren sound.

Press-and-Hold Function
Additional alternate sounds may be activated in two other selector switch positions by depressing and holding the horn ring circuit for as long as the alternate sound is desired. The chart below demonstrates how the horn ring circuit may be used for the "press-and-Hold" function.

Applications
Model PA300 is intended for use on any vehicle that requires a full featured siren.