Technical Manual

2-4 GUARDIAN VHF 110W MOBILE
2.4 RECM Control Hardware Theory of Operation
2.4.1 Control Logic
The control logic interfaces to the keypad logic, transceiver, internal audio, and Motherboard. The control logic
implements the main radio control function and all the baseband signal processing.
TCVR Module
DB25 Accessory Connector
Power Supply
Keypad Board and Front Panel Interface
Grey areas connect
through the 80-pin
connector on the
Motherboard.
Figure 2-2: Guardian Control Logic
2.4.1.1 Power Supply Unit
This block of circuitry takes the 7.8V regulated voltage together with a number of control signals to generate a
number of power supply outputs.