RTS 4WBA User Manual

4-Wire Buffer Amplifier

User Manual

9350-7767-000 8/2003

2

Proprietary Notice

The RTS product information and design disclosed herein were originated by and are the property of Telex Communications, Inc.
Telex reserves all patent, proprietar y design, manufacturing, reproduction, use and sales rights thereto, and to any article disclosed

therein, except to the extent rights are expressly granted to others.

Copyright Notice

Copyright 2003 by Telex Communications, Inc.. All rights reserved. Reproduction in whole or in part without prior written permission
from Telex is prohibited.

UNPACKING AND INSPECTION

Immediately upon receipt of the equipment, inspect the shipping container and the contents carefully for any discrepancies or
damage. Should there be any, notify the freight company and the dealer at once.

WARRANTY INFORMATION

RTS products are warranted by Telex Communications, Inc. to be free from defects in materials and workmanship for a period of
three years from the date of sale. The sole obligation of Telex during the warranty period is to provide, without charge, parts and labor
necessary to remedy covered defects appearing in products returned prepaid to Telex. This warranty does not cover any defect,
malfunction or failure caused beyond the control of Telex, including unreasonable or negligent operation, abuse, accident, failure to
follow instructions in the Service Manual or the User Manual, defective or improper associated equipment, attempts at modification
and repair not authorized by Telex, and shipping damage. Products with their serial numbers removed or effaced are not covered by
this warranty. To obtain warranty service, follow the procedures entitled “Procedure For Returns” and “Shipping to Manufacturer for
Repair or Adjustment”. This warranty is the sole and exclusive express warranty given with respect to RTS products. It is the
responsibility of the user to determine before purchase that this product is suitable for the user’s intended purpose.
ANY AND ALL IMPLIED WARRANTIES, INCLUDING THE IMPLIED WARRANTY OF MERCHANTABILITY ARE LIMITED TO THE
DURATION OF THIS EXPRESS LIMITED W ARRANTY. NEITHER TELEX NOR THE DEALER WHO SELLS
RTS PRODUCTS IS LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KIND.

CUSTOMER SUPPORT

Technical questions should be directed to:

Customer Service Department
RTS/Telex
12000 Portland Avenue South
Burnsville, MN 55337 U.S.A.
Telephone: [phone]
Fax: [phone]

RETURN SHIPPING INSTRUCTIONS
PROCEDURE FOR RETURNS

If a repair is necessary, contact the dealer where this unit was purchased.
If repair through the dealer is not possible, obtain a
RETURN AUTHORIZATION from:

Customer Service Department
Telex Communications, Inc.
Telephone: [phone]
Fax: [phone]

DO NOT RETURN ANY EQUIPMENT DIRECTLY TO THE FACTORY WITHOUT FIRST OBTAINING A RETURN AUTHORIZATION.
Be prepared to provide the company name, address, phone number, a person to contact regarding the repair, the type and quantity of

equipment, a description of the problem and the serial number(s).

SHIPPING TO MANUFACTURER FOR REPAIR OR ADJUSTMENT

All shipments of RTS products should be made via United Parcel Service or the best available shipper, prepaid. The equipment
should be shipped in the original packing carton; if that is not available, use any suitable container that is rigid and of adequate size. If
a substitute container is used, the equipment should be wrapped in paper and surrounded with at least four inches of excelsior or
similar shock-absorbing material. All shipments must be sent to the following address.

Telex Communications Inc.
8601 East Cornhusker Hwy
Lincoln, NE 68507
Attn Service Dept.

Upon completion of any repair the equipment will be returned via United Parcel Service or specified shipper collect.

3

End-User License Agreement for Telex® Software

IMPORTANT! - Please read this document carefully before using this product.

THIS DOCUMENT STATES THE TERMS AND CONDITIONS UPON WHICH TELEX
COMMUNICATIONS, INC. (“the COMPANY”) OFFERS TO LICENSE THE INSTALLED SOFTWARE OR
PROGRAM (“the SOFTWARE”) WITH THE PRODUCT IN WHICH IT WAS INSTALLED. YOU ARE
AGREEING TO BECOME BOUND BY THE TERMS OF THIS AGREEMENT. IF Y OU DO NOT AGREE TO
THE TERMS OF THIS AGREEMENT, DO NOT USE THIS PRODUCT . PROMPTLY RETURN THE PROD­UCT TO THE PLACE WHERE YOU OBTAINED IT FOR A FULL REFUND.

The installed software as supplied by the Company is licensed, not sold, to you for use only under the
terms of this license, and the Company reserves all rights not expressly granted to you. You own the
product or other media on or in which the Software is originally or subsequently recorded or fixed, but the
Company retains ownership of all copies of the Software itself.

1.License: This license allows y ou to use the Software for internal purposes only on a single
product in which it was installed.

2.Restrictions: (a) You may not market, distribute or transfer copies of the Software to others or
electronically transfer or duplicate the Software. YOU MAY NOT REVERSE ENGINEER,
DECOMPILE,DISASSEMBLE, MODIFY, ADAPT, TRANSLATE, RENT, LEASE OR LOAN
THE SOFTWARE OR CREATE DERIVATIVE WORKS BASED ON THE SOFTWARE OR
ANY ACCOMPANYING WRITTEN MATERIALS. (b) The Software and the accompanying
written materials are copyrighted. Unauthorized copying of the Software, including portions
thereof or the written materials, is expressly forbidden. (c) You understand that the Company
may update or revise the Software and in so doing incurs no obligation to furnish such up
dates to you.

3.Limited Warranty: The Company does not warrant that the operation of the Software will meet
your requirements or operate free from error. The Company DISCLAIMS ALL OTHER
WARRANTIES AND CONDITIONS EITHER EXPRESS OR IMPLIED, INCLUDING THE
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NON-INFRlNGEMENT OF THIRD PARTY RIGHTS.

4.Limited Liability: The liability of the Company for any claims arising out of this License based
upon the Software, regardless of the form of action, shall not exceed the greater of the license
fee for the Software or $50.

4

Table of Contents

General Description.............................................................................................................. 6

Features ............................................................................................................................... 6

Front Panel Controls ............................................................................................................6

Front Panel........................................................................................................................... 7

Rear Panel ........................................................................................................................... 7

Connector Specifications ..................................................................................................... 8

Specifications ....................................................................................................................... 9

5

General Description

The 4-wire Buffer Amplifier(4WBA) is a six channel, high performance audio line driver amplifier with trans­former balanced inputs and outputs. It can be used as a six input, six output group of individual amplifiers in a
1 RU mount. Electrical isolation between amplifiers is sufficient to eliminate any chance of of crosstalk.

Features

Transformer Balanced Input:

Each input uses two cross-coupled audio transformers to help minimize hum and
provide galvanic isolation.

Impedence:

Input impedance selection to either 600 Ohms or 10.0 K Ohms via 3-pin jumpers.

Gain:

-40 to +20 dBu, five step selectable and ±10dB gain volume for RX channel operating
level. -10 to +10 dBu adjustable for TX channel operating level. RX channel is
available for input mute position. Nominal setup level is selectable 0dBu or -10dBu,
via jumpers.

Limiter:

Threshold level is adjustable -30 to -10dBu, via panel trimmer. Each RX channel of
VOX tally output DB15F connector for the UIO256 GPI function.

Transformer Balanced Outputs:

Four Wire side of In/Outputs capable of driving 600 Ohm loads. Matrix site In/
Outputs stages transformer option.

Redundant Power Supply:

Dual power supply provides redundant operation. Bi-color LEDs and Fault LEDs
with tally output to DB15F connector.

Front Panel Controls

6

Front Panel Rear Panel

7

Connector Specifications

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8

Specifications

4-wire side

Connector type: DB-9 M (pin connection)
Receive Channel:

Input Gain Selector

+30/+20/+10/0/+10 dB 6 position

Input Gain Trimmer

±10dB selectable (except -)

Maximum Input Level:

+30dBu (Input protection circuit is
activated in cass of excess input)

Ouptut Gain Trimmer

±10dB adjustable

Ouput Circuit/ Impedance

Transformer balance output (600 transformer

connected)

Ground Setting

Floating (unfloating is selectable by jumper inside)

Signal Level Indicators

+10dBu (Red)
0dBu (Yellow)

-20dBu (Green)

Input Circuit / Impedance

Transformer balanced input 600 (20k
selectable)

Gate Circuit (Bypass is selectable with setting inside)

Threshold Level

-30dBu - 10dBu (selectable in front
panel by adjustable VR)

Audio Gate Attack Time

30 msec

Holding Time

3 sec (0.2.2 sec is adjustable with
VR inside)

Release Time

3 sec

Operation indication

Mute - Red LED turn OFF
VOX - Red LED turn ON

Filter Circuit

80Hz H.P. F. and 10KHz L.P.F.

Limiter Circuit

Threshold Level

+10dBu (adjustable -6dB + 12dB
via front panel trimmer VR

Gate Tally Circuit

Connector Type

DB-15F (Pin Connection)

Output signal

Open collecto output
DC 12V 50mA load operate is

possible
Mute = High (DC12V)
VOX = Low (0V)

Talk CH

Operating Output Level

0dBu (-10dBu is selectable by jumper inside)

Maximum Output Level

+10dBu (in case of adjustment 0dBu for

operating level, 600 load, 1KHz)

0 dBu (in case of adjustment -10dBu for

operating level, 600 load, 1KHz)

Matrix Side

Connector Type

DB-9F

Receive CH

Operating Output Level

0dBu

Maximum Output Level

+10dBu (in case of adjustment 0dBu for operating

level, 600 load, 1KHz)

Output Circuit/Impedance

Transformer balanced output 20
(Option: 600 balanced output by transformer

coupling)

Signal Level Indicators

+10dBu (Red)
0dBu (Yellow)

-20dBu (Red)

Talk CH

Operating Output Level

0dBu

Maximum Output Level

+20dBu

Input Circuit / Impedance

Activate balanced input 20K

(option 600 balanced input by transformer

coupling)

Ground Setting

Floating (Unfloating is selectable by jumper inside)

General

Frequency Response

Talk CH 50Hz 10kHz (-3dB)
Receive CH 80Hz 10kHz (-3dB)

Noise Level

-60dB (30.30kHz)

Distortion

0.5% (under limiter activate point)
Frequency range 100Hz 10kHz (0dBu Output)

9

Crosstalk

-60dB (30Hz-10kHz)

-80dB (1kHz)

CMRR

-70dB (30Hz-1kHz)

-50dB (15kHz)

Activate Warr anty Temperature

0.50

Power Supply

Power Requirements

+12V 2.5A 30W
DC/DC CON ±12 V 0.45A (on board)
2PS unit for Redundant

Power Supply Indicators

Bi-color LED display. When NORMAL,
Amber color turn ON. When in Fault,
PSU-1 shows a Red LED ON, PSU-2
shows a Green LED ON.

Fault Alarm Signal Output

Contact signal (make) output to GATE

TALLY OUT

Front panel Red LED will appear.

AC Inputs

AC 100V/240V ±10%

Power Consumption

100 W

Fuse

2 A (slow blow)

Dimensions / W eight

483(w) x 400(d) x 44(h) (mm)
excl. maximum protuberance
weight = 5Kg

10

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