UBS Axcera LU5000AT Exciter Switcher Assembly Manual

Instruction Manual

Single Channel Exciter Switcher

w/Innovator LX Series Transmitter

Axcera, LLC

103 Freedom Drive, P.O. Box 525 Lawrence, PA 15055-0525 USA

[phone] • FAX [phone]

www.axcera.com • [e-mail]

Single Channel Exciter Switcher, LX Series (1305715) Table of Contents

1. Introduction:

2. System:
A. System Description

B. Installation Instructions
C. Initial Turn On Procedure
D. System Operation Procedure
E. Drawings:

1. Single Channel Exciter Switcher 500/1kW Interconnect........................ 1305746

2. Single Channel Exciter Switcher 5kW Interconnect.............................. 1305741

3. Single Channel Exciter Switcher Tray:
A. Description

B. Drawings:

1. Interconnect ............................................................................... 1305739

4. Subassemblies:
This section contains the drawings of the boards and subassemblies that make up the

Exciter Switcher. A drawing list of the Boards and Subassemblies as they appear in
the section is located at the front of the section.

5. Maintenance:
The Section contains information on the normal operation and maintenance of the

Exciter Switcher. It also contains information on the plugs, jacks, sockets and pins
that make up the cable assemblies in the Exciter Switcher.

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Single Channel Exciter Switcher, LX Series (1305715) System Description

The Single Channel Auto Switcher consists of (A1) a Single Channel Exciter Switcher Tray
(1305715) with a separate (A2) coaxial transfer relay, mounted on a bracket that faces toward
the rear of the cabinet, behind the Switcher Tray. The Exciter Switcher Tray is designed to
monitor the selected On Air Exciter and automatically switch to the back up Exciter if the On Air
Exciter should malfunction. The coaxial relay has the RF outputs from both Exciters connected to
its inputs and, depending on if the energizing voltage is applied or not, the selected Exciter RF
Output is connected to the external amplifiers and the RF output from the other exciter is
connected to a load.

Functionally the Single Channel Exciter Switcher Tray contains an Exciter Switcher Control Board
(1305704), which provides the monitoring of the operation of both Exciters and the control of the
automatic switching of the Exciters in case of malfunction in the On Air Exciter. ICs on the board
monitor the operating parameters of the Excit ers and determine if the Exciters are functioning
properly. The front panel of the Exciter Switcher has an LCD display, which provides set up
screens for the operation of the switching process.

The coaxial relay has four “N” connectors that provide input and output connections to the relay.
The RF Output from Exciter “A” connects to J21. The RF Output from Exciter “B” connects to J23.
The Selected Exciter RF Output to the external amplifiers connects to J24. The Exciter “A/B”
Load connects to J22, to which the RF output of the Off Air Exciter is connected. A wire harness
connects to the relay from J14 on the Exciter Switcher Control Board. These connections provide
the control voltages to the relay from the control board and status indication connections back to
the control board.

This Instruction Manual contains the Schematics, Interconnects, Assembly Drawings and
Replacement Parts Lists needed for the troubleshooting of the Exciter Switcher. The Manual also
contains information on the operation and maintenance of the Exciter Switcher.

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