Description
The PA640 is a precision built, efficient and economical full-featured electronic siren and light control system. The siren provide wail, yelp, and priority or high-low siren tones as well as the horn ring transfer Tap II feature, public address (PA), radio rebroadcast and an air horn sound. On-board relays in the unit allow centralized control and wiring of primary, secondary, alley lights, and auxiliary circuits with a lighted rubberized membrane switch assembly. A convenient four position Mode slide switch allows simplified and rapid selection of most common siren and lighting functions and changes the horn ring function according to provide the Tap II feature. A noise canceling microphone is provided. It provides high quality voice reproduction without feedback squeal. The microphone push-to-talk switch overrides any siren sound for instant Public address use. PA volume is adjustable by means of a front panel VOLUME control. The PA640 is designed to drive one 11-ohm impedance high power (100W) speaker. The horn ring transfer feature allows the driver to change the siren sound from wail to yelp to priority high-low to wail… via the vehicle?s horn ring. This features provides especially effective traffic clearing capability. Each slide switch position can be individually programmed for siren dependency, transfer of the horn ring, and selection of the no siren tone to either airhorn or peak and hold. To reduce standby power consumption the power output audio and pre-amplifiers are not powered when not in use.
