Clear-Com IF4W4 Datasheet

The IF4W4 modular 4-wire interface connects camera intercoms,
two-way radios, fiber optics, and other 4-wire devices to a standard
Clear-Com intercom line. The 1-RU chassis holds up to four individual
interface modules, each with its own 4-wire terminal block and
XLR-3M connector to interface with Clear-Com.

The IF4W4 accepts balanced or unbalanced 4-wire input and is
transformer isolated. It is powered by the Clear-Com intercom line,
using standard two-conductor shielded mic cable.

Front Panel Capabilities

Front-panel controls allow the user to adjust the operating
parameters for each interface module, optimizing the interface
between the 4-wire device and the party line. Capabilities include:
adjusting the transmit and receive levels between the intercom
system and the 4-wire line; optimizing the hybrid null balance;
switching the transmit level between mic and line level; and
emulating either a carbon or a dynamic microphone. A two-color
LED transmit-level indicator gives a visual indication of send levels
to the transmit lines.

A front-panel test jack is connected to a built-in oscillator. Using
the null control and an earphone with a 1/8” plug or 4-pin headset,
the user can quickly null the send/receive hybrid. Set-up switches
allow the user to assign the interfaced devices to separate intercom
channels, or to assign any or all to a single party line.

Connections

Each interface module has its own set of transformer-isolated
connectors. The terminal block provides a pair of connections for
both transmit and receive signals, with a 600-ohm load across the
receive line. An XLR-3M connector provides the link between the
interface and the Clear-Com intercom line.

www.clearcom.com

Features:

• Interfaces TV cameras, 2-way radios,
fiber-optic circuits, and other devices
to Clear-Com party-line intercom

• Each interface has individual transmit,
receive, and null controls

• Transmit output switchable between
mic and line level, with transmit-level
indicator

• Built-in test jack and oscillator enable
quick nulling of the transmit/receive
hybrid

• Selective party-line capability

• Accepts balanced or unbalanced
4-wire input

• Transformer isolated

• Terminal block and XLR connectors
provided for each interface

• Powered by the Clear-Com line

Clear-Com Encore

TM

IF4W4 4-Wire to Party-Line System Interface

IF4W4 front view

www.clearcom.com

Americas & Asia 850 Marina Village Parkway, Alameda, CA 94501 USA Tel: [phone]
Europe, Middle East & Africa 7400 Beach Drive, Cambridge Research Park, Cambridge, UK Tel: [phone]

© 2007, Vitec Group Communications, LLC. All rights reserved. ® Clear-Com is a registered trade mark of The Vitec Group plc.

Channel A

-40dB -20dB 0dB

Transmit Receive

154 2

Channel B

-40dB -20dB 0dB

Transmit Receive

154 2

Channel C

-40dB -20dB 0dB

T

ransmit

Receive

154 2

Channel D

-40dB -20dB 0dB

Transmit Receive

154 2

4-Wire Transmit Level

4-WireTransmit Level 4-Wire Transmit Level

4-Wire Transmit Level

Clear-Com Encore

TM

IF4W4 4-Wire to Party-Line System Interface

IF4W4 back panel

Technical Specifications:

dBu is an absolute measurement.
0 dBu is referenced to 0.775 volts RMS

Program Line Input

Input Impedance : >= 1KΩ

Party Line Output

Output Impedance: >10KΩ

Stage Announce/Balanced Line Out

Type: Balanced
Output Impedance: >= 80Ω
Load Impedance: >= 600Ω

Frequency Response

Program Input - Party Line: 200 - 18KHz ± 3dB
Party Line - Line Out: 200 - 18KHz ± 3dB

Max Distortion

Program Input - Party Line: <= 0.2%
Party Line - Line Out: <= 0.5%

Noise

Program Input - Party Line: < -85dBu
Party Line - Line Out: < -60dBu

Max Gain

Program Input - Party Line: >= -16dB
Party Line - Line Out: >= 24dB

Min Gain

Program Input - Party Line: <= -20dB
Party Line - Line Out: <= -45dB

Line Out LED Threshold

Green: -7dBu ± 2dB
Red: +5dBu ± 2dB

Party Line LED Threshold

Green: -10dBu ± 2dB
Red: 0dBu ± 2dB

Power

Input Voltage Range: 20-30 VDC
Input Current (Idle): <= 40mA
Input Current (Max): <= 50mA

Rear Panel Connectors

Intercom: (4) XLR-3F

(1 per channel)
4-Wire Terminal
Block Connectors: (4) Connectors

(1 per channel)
4-Wire Transmit
Level Switches: (4) Switches

(1 per channel)

Front Panel Connectors

Headset: (1) XLR-4M
TS1 Earphone: (1) 3.5mm Jack

Socket

Front Panel Controls & Indicators

Green Level LED: (4) LEDs

(1 per channel)
Red Level LED: (4) LEDs

(1 per channel)
Link LED: (4) LEDs

(1 per channel)
Power LED: (4) LEDs

(1 per channel)
Null Test Button: (4) Buttons

(1 per channel)
Receive Level Adjust: (4) In controls

(1 per channel)
Transmit Level Adjust: (4) Out controls

(1 per channel)
Nulling Adjust: (12) Null controls

(3 per channel)
Channel Link Switch: (3) Link switches

(A+B, A+C, A+D)

Environmental:

32 - 122˚F (0 - 50˚C)

Dimensions

19 in. W x 1.75 in. H x 7.75 in. D
(483 mm x 44.5 mm x 197 mm)

Weight

5.83 lbs. (2.65 Kg)

Notice About Specifications

While Clear-Com makes every attempt to maintain the
accuracy of the information contained in its product
manuals, that information is subject to change without
notice. Performance specifications included in this manual
are design-center specifications and are included for
customer guidance and to facilitate system installation.
Actual operating performance may vary.