Crown FM-1 Manuel d'utilisateur télécharger pdf (Page 5)

Section 1-Getting Acquainted

This section provides a general description of the Crown Redundant Transmitter

Controller and introduces you to safety conventions used within this document.

Review this material before installing the RTC.

The RTC System

The Crown FM RTC Redundant Transmitter Control is a simple, easy to use

solution for creating redundant broadcast transmitter systems. A complete redun-

dant transmission system consists of the following:

• Two Crown Broadcast FM transmitters (FM30, FM100, FM250 or FM500)

• A Crown FM RTC system controller with interface cables

• An antenna switch

The FM RTC automatically switches from the primary to the secondary transmitter

when any of the following conditions occur

• Loss of program audio

• When transmitter power drops below a preset limit for more than 4 seconds

• A fault in the transmitter.

Once the problem condition clears, the FM RTC returns the primary transmitter to

operation.

Antenna Switch

An electrically operated RF switch switches transmitters in the system. The

FM RTC continuously monitors the state of the antenna RF switch. If the antenna

switch either fails to switch correctly or unexpectedly changes states, the Crown

FM RTC disables both transmitter carriers until the station engineer corrects the

problem and resets the system.

FM RTC

PrimaryFM

Transmitter

SecondaryFM

Transmitter

Antenna

Switch

Antenna

AC Power

Remote I/O Cable

RFSwitch Control

AuxI/O,RS-232

Relay Output, and 2

Opto-Isolated Inputs

Progam Audio

Remote I/O Cable

RF Coax Port 1 RF Coax Port 3

RF Coax Port 2

1 2 3 4 5 6 7 8 9 10 ... 17 18

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Crown FM-1 Manuel d'utilisateur Page 5