Telex Audiocom IFB-1000 Operating Instructions Manual

Te l e x

®

Operating Instructions

IFB-1000
Belt Pack

Intercom System

FACTORY SERVICE

All equipment returned for repair must be accompanied by documentation
stating your return address, telephone number and proof of date of
purchase, along with a description of the problem.

Return equipment to:

Factory Service Department
Telex Communications, Incorporated
West 1st Street
Blue Earth, MN 56013 U.S.A.

Warranty Repairs - If in warranty, no charge will be made for the repairs.
Equipment being returned for warranty repair must be sent prepaid and
will be returned prepaid.

Non-Warranty Repairs - Equipment that is not under warranty must be
sent prepaid. If requested, an estimate of repair costs will be issued prior
to service. Once your approval for repair, and repair of equipment is
completed, the equipment will be returned on a collect basis. Collect
charges may be avoided by sending a signed check for payment in full
along with your signed estimate approval form (the estimate includes the
shipping charge.)

CUSTOMER SUPPORT

Technical questions should be directed to:

Customer Service Department
Telex Communications, Inc.
12000 Portland Avenue South
Burnsville, MN 55337 U.S.A.

Telephone: [phone]
Fax: [phone]

9350-7477-000 Rev. B 10/2000

GENERAL

The Audiocom® IFB-1000 is a one-channel listen only IFB belt pack.

OPERATION

SYSTEM POWER

The IFB-1000 belt pack receives power externally, via the intercom
channel.

IFB-1000 SETUP

The channel termination is set for balanced operation, which is compat­ible with other Audiocom equipment.

The headset/earset jack is set for 150 ohm operation.

EXTERNAL CONNECTIONS & CONTROLS

1 2

4

HEADSET

3

IFB-1000

1. Volume Control.
Use this control to adjust the headset/earset listen level.

2. On Indicator
This LED glows green when the belt pack is connected to an intercom
channel that is functioning.

3. Headset Connector
This connector accepts a wide-response earset, such as the Telex
EMV-2 (catalog number 60194-001), with a 1/4” monaural phone plug.

4. Intercom Channel Connectors
The IFB-1000 intercom channel is connected via a 3-pim female
connector. The IFB-1000 is powered from the intercom system power
supply and will turn on with the intercom system.

CONNECTOR PIN CONFIGURATIONS

HEADSET CONNECTOR

Type: 1/4” Monaural Plug

Sleeve Headset audio low
Tip Headset audio high

INTERCOM CHANNEL CONNECTORS

Type: XLR-3F

Pin 1 Common
Pin 2 Intercom audio and +24 VDC input
Pin 3 Intercom audio and +24 VDC input

SPECIFICATIONS

GENERAL:

Channel Supplied Power Requirements:

+24 VDC nominal (standard Audiocom line), 50 to 80 mA

Environmental Requirements:

Storage: -20°C to 80°C; 0% to 95% humidity, non-condensing
Operating: 0°C to 50°C; 0% to 95 % humidity, non-condensing

Dimensions:

3.25” (82.6 mm) H x 3.5” (88.9 mm) W x 1.8” (45.7 mm) D

Weight:

1.0 pounds (0.45 kg)

INTERFACE REQUIREMENTS:

Earset:

150 to 600 ohm headphones

Balanced Intercom Channel Level & Impedance:

1 Vrms nominal; 300 ohms ±5%

Noise Contribution:

Less than -60 dB on the line.

HEADPHONE AMPLIFIER:

Voltage Gain:

27 ±3 dB from the line

Maximum Output:

60 mW into 150 ohms

Frequency Response:

200 Hz to 8 kHz +1/-3 dB