Raymarine Apelco 5200 User Manual

SECTION 4
TECHNICAL DESCRIPTION
4.1 GENERAL
The VHF5200 can be considered as consisting of two major sections. They are:
l The Control Circuitry (consisting of the front panel controls, the LCD display, control
CPU).
l The Transmitter/Receiver/PLL circuits.
4.2 THE CONTROL SECTION
The heart of the control section is the CPU, IC201, located on the main PCB.
The CPU controls all of the following items:
l Controls the Squelch circuit by detecting a busy signal from the second IF circuit IC5.
l Generates a beep tone when a key is activated on the keyboard.
l Mutes the transmitter modulation circuit when receiving.
l Controls the output power of the transmitter High/Low.
l Controls the dividing ratio N of the PLL circuit.
l Switches On/Off the transmitter power.
l Mutes AF audio.
l Detects a weather alert signal (when in Monitor Mode).
l Controls the LCD display.
4.3 THE TRANSMITTERIRECEIVERPLL SECTION
In reading through the following circuit descriptions, it may be helpful to refer to Figure 4-l Block
Diagram of the TX/RX/PLL circuits.
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Raymarine Apelco 5200 Specifications

General

Brand	Raymarine
Model	Apelco 5200
Category	Radio
Language	English