Carrier Operated Switch Output; Ctcss - RF Technology R220 Operation And Maintenance Manual

7 SPECIFICATIONS
Logic Input Levels: 0 = < 0.4 Volts
1 = > 3.5 Volts
Internal 10K pull down resistors selects Channel 00 when all inputs are O/C.
7.4.20

Carrier Operated Switch Output

Floating Opto-Coupler Output: The carrier operated switch output is via an opto-
coupler. Collector and emitter connections are available to allow connection for
source or sink.
The opto-coupler can be linked inside the receiver to be on when a carrier is detected
or to be on in the absence of carrier.
Connection to Remote Switch via 600Ω Ω Ω Ω Line: Internal connections are provided so
that the opto-coupler can be connected to the 600 Ω line for use over a single pair.
This permits remote switching with no extra connections.
Current Source/Sink, Collector Voltage: The COS output is implemented with an
optocoupler whose ratings are:\\
Ic = 10mA Maximum
Vc = 30 Volts Maximum
7.4.21

CTCSS

The CTCSS decoding is provided by a hybrid module. This provides programmable
decoding of all 38 EIA and 12 other common tones. Refer to table 4.
RF Technology R220
7.4.20 Carrier Operated Switch Output
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