Audio Authority 975A Manuale utente

ANTENNA

INPUT CD CHANGER

INPUT

RADIOS SYSTEM

BUS

CAR AM/FM

AMPLIFIER

975A

Model 975A AM/FM Distribution Amplifier

Installation Instructions

The Model 975 is a 12-volt powered AM/FM antenna amplifier designed to drive car radio antenna distrib -

tion systems. It also accepts the RF o tp t of one or more CD changers. Yo r Car RF system can be expanded

to serve p to 32 radios sing A dio A thority® KIT17s. Each KIT17 contains a 4-way tap and Motorola

cables for 4 radios. If yo need to distrib te RF to more than 32 radios, call A dio A thority at 800-322-8346

or 859-233-4599.

Installation

Mo nt the Model 975A close to the radios and switching system and connect as shown in Fig re 1. Place each

4-way tap within 2 to 3 feet of the radios it serves. Connect the distrib tion system as shown in Fig re 2,

tightening all F-connectors sec rely. Be s re to add the termination pl g to the last tap in the system as

shown. Caution: Prevent n sed Motorola cables from contacting live cond ctors inside the display.

In Access™ switching systems, power the Model 975A from the Access™ System B s like any other Access EZ™

mod le.

In non-Access™ System applications, pl g a length of Access™ System B s

cable into the System B s port. Connect the red wire to a so rce of 12V (+)

DC and c t off the other three wires (gro nd is s pplied thro gh radios).

An indoor antenna will s ffice for

inp t to the Model 975A in most cases.

Use either the incl ded wire antenna

or a car antenna. Pl g the antenna

directly into the antenna jack of the

Model 975A as shown in Fig re 1. If

an indoor antenna prod ces too little

FM signal or too m ch m ltipath

distortion, an o tdoor antenna may be

desired. Use an omnidirectional FM

antenna if the only problem is a weak

FM signal, or se a directional FM or

VHF TV antenna to improve

m ltipath problems. Bring the 75-ohm

downlead from the o tdoor antenna

into the b ilding via a well-gro nded

lightning arrestor as shown in Fig re

2. Install a Motorola pl g on the cable

going to the Model 975A’s antenna

jack or se an F-to-Motorola adapter.

NOTE: O tdoor antennas will red ce

AM performance.

From CD Changers

Car Antenna

To Radios

System Bus from any Access™Module

Figure 1. Model 975A Hookup

Details. Use one of these

indoor antenna options, or an

outdoor antenna, as shown in

Figure 2.

Yellow wire on

this side

Included Wire

Antenna

980

975A

Car Radios

Last 4-Way Tap

Termination

Plug Optional

Outdoor

Antenna

Distribution

Amplifier

CD Changers

Lightning

Arrestor

Model 980

System Bus

Figure 2. A complete FM Distribution System.

Changer

RF Modules

Ground

Rod

OUT

752-255

11/00

Daisy-chain all the RF-o tp t CD changers in yo r

display and pl g the last changer of the string into

the CD changer jack of the Model 975A. Radios can

receive both radio stations and signal from CD

changers at the same time.

If yo enco nter any problems with this prod ct or

its installation, contact A dio A thority Technical

Service at 800-322-8346.

2048 Mercer Road, Lexington, Kentucky 40511-1071

Phone: 859-233-4599 • Fax: 859-233-4510

Customer Toll-Free USA & Canada: 800-322-8346

Website: http://www.audioauthority.com

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