Operating instructions

Page 20 RF Technology R350/R500

7 SPECIFICATIONS 7.4.18 Audio Distortion

Monitor Loudspeaker: 3 Watts with external speaker, 0.3 Watt with internal

speaker

Discriminator and Sub-Audio: Nominally equal to 1 volt peak at rated system

deviation

7.4.18 Audio Distortion

750µs De-Emphasis: Less than 3% at 1 kHz and 60% of rated system deviation

Flat Response: Less than 10% at 1 kHz and 60% of rated system deviation

7.4.19 Channel Select Input / Output

Coding: 8 lines BCD coded 00-99

Logic Input Levels: 0 <= 1.0 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.

Via 600Ω Line: Internal connections are provided so that the opto-coupler can be

connected to the 600Ω 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

opto-coupler 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.