User Manual

RF Technology R220 Page 19

7 SPECIFICATIONS

7.1.4 Channel Selection

Channel selection is by eight channel select lines. These are available through the

rear panel connector.

A BCD active high code applied to the lines selects the required channel. This can be

supplied by pre-wiring the rack connector so that each rack position is dedicated to a

fixed channel.

BCD switches inside the receiver can be used to pre-set any desired channel. These

eliminate the need to externally select the channel.

7.1.5 Microprocessor

A microprocessor is used to control the synthesizer and squelch functions and

facilitate the channel frequency programming. With the standard software it also can

provide fault monitoring and reporting.

7.2 Physical Configuration

The receiver is designed to fit in a 19 inch rack mounted frame. The installed height

is 4 RU (178 mm) and the depth 350 mm. The receiver is 63.5 mm or two Eclipse

modules wide.

7.3 Front Panel Controls, Indicators and Test Points

7.3.1 Controls

Mute defeat switch - toggle (Overrides CTCSS, noise and carrier squelch at the

monitor output)

Monitor Speaker Volume - Knob

Line Output Level - screwdriver adjust multiturn pot

Noise Squelch Setting - screwdriver adjust multiturn pot

Carrier Squelch Setting - screwdriver adjust multiturn pot

7.3.2 Indicators

Power ON - Green LED

Squelch Open - Yellow LED

Fault Indicator - Flashing Red LED