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GENERAL

1.1 Introduction

The VT-3A130 Transmitter is a synthesized multichannel AM transmitter designed to interface with

the MT-3 Repeater Systems, while still maintaining MT-2 system compatibility. Both MT-3

systems are characterized by dependable low maintenance performance under the most severe

environmental conditions. All performance measurements comply with Industry Canada (IC)

Standard Specification RSS 119 and 140, as well as the Federal Communications Commission

Part 87 for AM equipment. In addition, all units are burnt-in for 24 hours and are accompanied by

a complete test report.

The VT-3A130 Transmitter operates in the 118 - 138 MHz aviation band. The transmitter's

frequency stability is controlled by an OST-3A128 Synthesizer. The synthesizer module can be

programmed to have up to 16 channels. A channel programmer can preprogram the first 15

channels; channel 16 can be programmed from the front panel and channel 1 can be programmed

by the four BCD switches located on the MT-3 AM Transmitter Main Board.

1.2 Manual Organization

The organization of this manual reflects the modular makeup of the VT-3 product line. Each

module is fully described within its respective submanual, all of which are contained within this

document. In general, each submanual contains:

1. A functional description and specification summary.

2. A detailed technical description (Theory of Operation).

3. Assembly, setup and alignment procedures relevant to that particular module.

* Note * Material presented in a given "sub-manual" may include information related to other

module versions not directly applicable to the VT-3A130 transmitter family. The OS-3H

synthesizer module is a prime example, having family members covering from 29 to 512 MHz.

DANIELS

ELECTRONICS

VT-3A130 VHF AM Transmitter Instruction Manual

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