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350-Watt Digital VHF LB Transmitter Chapter 2, System Description, Maintenance &

Remote Control Connections

DT325B, Rev. 0 2-1

Chapter 2

System Description, Maintenance and Remote Control Connections

Figure 2-1: Driver/Amplifier Chassis Assembly

Table 2-1: DT325B Major Assemblies and Trays

ASSEMBLY

DESIGNATION

TRAY/ASSEMBLY NAME ASSEMBLY NUMBER

A24 Axciter Modulator 1305842

Driver/Amplifier Chassis

Assembly

1310206

A2-A11 Backplane Board 1310080

A2-A1 Downconverter Module 1311157

A2-A5 Upconverter Module 1310226

A2-A4 Control/Power Supply Module 1310835 (220 VAC)

A3 VHF Low Band Amplifier Tray 1304363

2.1 System Overview

The DT325B is a complete VHF low band

solid-state digital television transmitter

that operates at a nominal average

output power of 350 watts.

The transmitter needs an AC input line of

220 VAC at 40 amps that connects to the

AC Distribution Panel which distributes

the AC through AC power cords to the

VHF exciter/driver chassis and the VHF

amplifier tray.

The DT325B consists of (A24) an Axciter

Modulator Tray, (A2) a Driver/Amplifier

Chassis Assembly and (A3) a VHF Low

Band Amplifier Tray. The assemblies and

trays are listed in Table 2-1.

2.2: Exciter Driver Chassis Assembly,

LXB, 220 VAC (1310206; Appendix C)

The chassis assembly is factory set for

operation using 220 VAC. All of the

modules, except the power amplifier

module and the power supply section of

the Control & Monitoring/Power Supply

Module, plug directly into a backplane

board. The backplane board (1310080)

provides module to module

interconnection as well as interconnection

to remote command and control

connectors.

NOTE: Information and drawings on the

Axciter Modulator Tray (1305842) and

the Upconverter Module (1310226) and

Downconverter Module (1311157) are

found in the separate Axciter Manual.