Audio Authority installation instructions Model 975A AM/FM Distribution Amplifier

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 distribu- tion systems. It also accepts the RF output of one or more CD changers. Your Car RF system can be expanded to serve up to 32 radios using Audio Authority® KIT17s. Each KIT17 contains a 4-way tap and Motorola cables for 4 radios. If you need to distribute RF to more than 32 radios, call Audio Authority at 800-322-8346 or 859-233-4599.

Installation

Mount the Model 975A close to the radios and switching system and connect as shown in Figure 1. Place each 4-way tap within 2 to 3 feet of the radios it serves. Connect the distribution system as shown in Figure 2, tightening all F-connectors securely. Be sure to add the termination plug to the last tap in the system as shown. Caution: Prevent unused Motorola cables from contacting live conductors inside the display.

In Access™ switching systems, power the Model 975A from the Access™ System Bus like any other Access EZ™ module.

In non-Access™System applications, plug a length of Access™ System Bus cable into the System Bus port. Connect the red wire to a source of 12V (+) DC and cut off the other three wires (ground is supplied through radios).

Figure 1. Model 975A Hookup Details. Use one of these indoor antenna options, or an outdoor antenna, as shown in Figure 2.

An indoor antenna will suffice for input to the Model 975A in most cases. Use either the included wire antenna or a car antenna. Plug the antenna directly into the antenna jack of the Model 975A as shown in Figure 1. If an indoor antenna produces too little FM signal or too much multipath distortion, an outdoor antenna may be desired. Use an omnidirectional FM antenna if the only problem is a weak FM signal, or use a directional FM or VHF TV antenna to improve multipath problems. Bring the 75-ohm downlead from the outdoor antenna into the building via a well-grounded lightning arrestor as shown in Figure

2.Install a Motorola plug on the cable going to the Model 975A’s antenna jack or use an F-to-Motorola adapter.

Car Antenna

Included Wire

Antenna

975A CAR AM/FM

	AMPLIFIER
ANTENNA	CD CHANGER
INPUT	INPUT

From CD Changers

NOTE: Outdoor antennas will reduce AM performance.

RADIOS	SYSTEM
	BUS

To Radios	Yellow wire on
	this side

System Bus from any Access™ Module