Clear-Com Encore User Manual

Clear-Com Communication Systems
Encore System Installation Instruction Manual
1-9
intercom line. These connectors are wired in parallel. Any
single-channel station or channel of a multi-channel station
connected on a line plugged into Channel A of the a Main Station
will be "party-lined" with all the other stations on that channel. In
a multi-channel system, the goal is to assign specific people to
the correct group, i.e. the other people they need to be in contact
with the most. This is particularly important when the party line
users are on a single-channel beltpack or station; less so if they
are on multi-channel stations. The pinout of the intercom
connectors is as follows:
• Pin 1 --- Ground (Shield)
• Pin 2 --- Power
• Pin 3 --- Audio
• Line Termination: The fundamental concept of Clear-Com
Party-Line intercom is that all channels are terminated in one
location, preferably at a Main Station or Power Supply.
Note: All intercom lines must be terminated. Care must be taken
not to '"double-terminate" a line. All unused intercom lines
must also be terminated.
Switching of the channel terminations ON and OFF is done with
switches or jumpers on the Main Station. In most systems, the
terminations should be in the ON position (default setting).
Clear-Com Power Supplies also provide switch-selectable
termination networks on all intercom lines. Refer to the User
manual for the specific Main Station or Power Supply for the exact
location. It is up to the user to ensure that the terminations are set
correctly. An unterminated line will cause excessive levels, possible
oscillation of line drivers, and squealing in the headsets. An
intercom line with double or multiple terminations will cause low
levels and the inability to null the headsets.
The termination switches on a Main Station should be set to the OFF
position only if the channel is terminated by another Main Station or
Power Supply in the system. If there are no other Main Stations
or Power Supplies terminating the line, the termination switch
on each channel of the Main Station should be switched to ON.
• Headset Connector: The headset connector is located on the
front panel of all stations. Clear-Com headsets are
recommended, but others can be used if they meet the following
requirements:
• Mic Type --- Dynamic; 150 to 250 ohms impedance; -55 dB
output level
• Headphone --- Dynamic; 50 to 2000 ohms impedance
The wiring of the headset is to be as follows:
• Pin 1 --- Mic common

Clear-Com Encore Specifications

General

Brand	Clear-Com
Model	Encore
Category	Intercom System
Language	English