Operating instructions

AC-10
ADAPT-A-COM INSTRUCTION SHEET
DESCRIPTION:
The Clear-Com AC-10
is a versatile, active hybrid
device that interfaces
the Clear-Com intercom
system with a variety
of other communication
systems. These include
two-wire, three-wire,
and
four-wire
telephone type
systems, carbon systems,
and other closed-circuit
intercom systems.
The AC-10
s front panel controls include
a Mode Select switch,
Transmit and Receive level
gains,
and
A and B Balance controls.
An impedance select
switch is located on the
rear panel.
SET-UP:
1) Connect
the Adapt-A-Com
to you Clear-Com
system via the connector
marked Clear-Com
on
the rear panel,
using standard
two-conductor
shielded mic cable.
The pin assignment
on this
3-pin,
XLR-type female connector
is:
Pin 1: common'
Pin 2: +30 volts DC
Pin 3: intercom audio
2) Select
your mode of operation with
the Mode Select switch:
2-wire, 3-wire, or 4-wire.
The 2-
wire mode is
typically used with telephone-type
carbon systems.
The impedance select
switch on the rear
panel should be set to 'Hi
Z" for TELCO type lines
and 60052 television
camera systems. It
is set to "Low Z" only when
used with low impedance
television intercom
systems such as the RCA or Daven
types.
The 3-wire mode
is used with separate
transmit and receive lines
with a common ground.
This mode "looks"
like a carbon headset, and
can be used to plug directly
into the headset
jack of a carbon system (such
as a TV camera).
The 4-wire
mode is used when you
have a separate transmit
pair and a separate receive
pair.
NOTE: In
the 3-/4-wire mode, the
B Balance control is not operative.
The impedance
select
switch must be
set to the "Hi Z"
position when the
AC-10 is used
in the 3-/4-wire
mode.
3) Connect the AC-10 to
the external communication
system via the rear panel
binding posts.
2-WIRE: Connect the AC-10
to all two wire systems
using only the top two
binding posts (the
red ones).
3-WIRE:
For 3-wire systems,
jump the two black binding
posts together for the
common
ground. Connect the red
binding post marked transmit'
to the portion of the
circuit that the
AC-10
sends signals on, and
the other red binding post
(marked "receive') to the
portion of
the circuit that the
AC-10 is to receive
signals from.
4-WIRE: Fora 4-wire
system, use alliourbinding
posts: a red and blackpairforthetransmit,
and a
red
and black pair for the receive.
BALANCING
THE INTERFACE:
NOTE: Before balancing
the system, be sure
that the connections to both
Clear-Com and the
external communication
system have been
made. Balance cannot
be achieved unless both
systems are connected.
Balance is obtained
with a built-in test tone via
the A and B Balance
switches.
810060
Rev. C 10/90
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