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Controller Circuits

3.0

Controller Circuits

3.1

The controller board is the central interface between the various subsystems of the radio. It provides

the following functions:

interface with controls and indicators

serial bus control of major radio circuit blocks

encoding and/or decoding of selective signaling formats such as PL, DPL, MDC1200 and

QuikCall II

interface to CPS programming via the microphone connector

storage of customer-specific information such as channel frequencies, scan lists, and

signaling codes

storage of factory tuning parameters such as transmitter power and deviation, receiver

squelch sensitivity, and audio level adjustments

power-up, power-down and reset routines

In the UHF and VHF sections, the Radio Block Interconnect Diagram show the interconnections

between the controller and the various other radio blocks, while the Controller Interconnect

Schematic diagram (in this chapter) shows the connections between the following circuit areas

which comprise the controller block:

microprocessor circuitry

audio circuitry

DC regulation circuitry

rotary and pushbutton controls and switches

The majority of the circuitry described below is contained in the Microprocessor Circuit schematic

diagrams. However, portions are also found in the DC Regulation and UHF/VHF Audio Circuit

schematics.

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