Channel Selection; Microprocessor; Physical Configuration; Front Panel Controls, Indicators And Test Points - RF Technology R220 Operation And Maintenance Manual

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
RF Technology R220
7.1.4 Channel Selection
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