RTS RMS300 Manual de servicio descargar pdf (Pagina 10)

TECHNICAL DATA PACKAGE

Model RMS300

Intercom System Rack Mount Speaker User Station

Use shielded cable to interconnect user stations in ar-

eas of possible electrical interference, (areas such as

those near: digital equipment, high current primary

power conductors ("mains"), transformers, transmit-

ters, and lamp dimmers).

Most two channel applications may use either stan-

dard microphone cable (for convenience) or two-

twisted-pair cable (considerably less expensive than

microphone cable). Standard wire size for the

Intercom System is #22 gauge wire for interconnec-

tion. For permanent installations it is recommended

that each channel should have individually shielded

twisted pair of at least #22 gauge wire, such as

Belden #8723 for 2 channels. Connect the shield to

system common

but do not tie the shield to chassis,

earth or connector shell ground.

223 Crosstalk Control

In the

Intercom System all channels share a

common circuit ground return. Crosstalk due to

common ground resistance can be lowered by re-

ducing the common ground resistance. Reduction of

ground resistance can occur as a side benefit of using

shielded cable, since the shield drains can be tied to-

gether and electrically parallel the circuit ground.

Another way of lowering resistive crosstalk is to

"homerun" all interconnecting cables to a central or

"home" location. In this configuration, the ground

path is short and the corresponding ground resistance

is small. Crosstalk due to mutual capacitance occurs

when the signal on one wire of a twisted pair couples

into the other wire. Separating the two conductors

with a shield greatly reduces the capacitive crosstalk.

To reduce both capacitive and resistive crosstalk and

to afford a degree of RF and electrostatic shielding,

use a cable which has a shielded twisted pair for each

channel. Each pair consists of a conductor for the

channel, a conductor for circuit ground return and a

shield around the two conductors. The shield is ac-

cessed via a drain conductor. This drain conductor

and the shield can augment the circuit grounds and

thus lower the ground resistance.

cable connectors are lifted out of the mud or snow

and protected with plastic bags. Water, mud and

snow in connectors can cause considerable audible

noise.

2.2.5 Hlam Prevention

Prevent inducing hum into the system by not locating

user stations near hum sources such as power

transformers, electrical switch panels, lamp dimmers

or TV cameras. When the microphone switch is

turned on, the dynamic microphone acts as a sensitive

antenna for hum sources.

2.4 USER STATION CONNECTIONS

Dynamic Microphone headset connector:

XLR-4-31 type receptacle (Jl)

Input level: -55 dbu nominal

Output Ievel to headphone: 10 volts peak-to-peak

open circuit.

Microphone low

Microphone high

Pin 3

Headphone low

Pin 4

Headphone high

Carbon Microphone headset connector: Standard

114" Phone Jack (52)

Input level: -15 dbu nominal

Output to Headphone: 10 volts peak-to-peak open

circuit.

Tip

Carbon Microphone

Ring

Headphone

Sleeve

Common/ground

Line input connectors: (53154)

XLR-3-31/32 types (for two-channels)

Common (low side of line)

Pin 2

Channel

Pin 3

Channel 2

Routing the TW Intercom System cables along the

XLR-4-31/32 types (for three-Channels)

same ductways and pathways as power cabling can in-

crease the noise and hum levels.

Channel

Pin 2

Channel 2

22.4 Moisture

Contamination Protection

Pin 3

Channel 3

Pin 4

Common (low side of lime)

When using equipment in the rain, always protect the

equipment with plastic covers----also, make sure all

RTS Systems, Burbank, CA 91506

FSCM: 60572 TDP3504

Third Edition, Sept. 1989

Page 2-2

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RTS RMS300 Manual de servicio Pagina 10

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