Parts List

VHF Enhanced Transmitter Instruction Manual VT-3 132 - 174 MHz 1-1
1 GENERAL
1.1 Introduction
The VT-3 132 - 174 MHz Transmitter is a low power, synthesized FM transmitt er capable of
operating in 12.5 kHz or 25/30 kHz channels. The transmitter operates continuous duty in one of
two frequency bands: 132 to 150 MHz or 150 to 174 MHz and its output power is continuously
adjustable from 0.5 T0 2.0 or 2.0 to 8.0 Watts. A modular design allows each of the transmitter's
modules; MT-3 Transmitter Board, MT-3 Audio Processor, VT-3/150 Amplifier, and OS-3H150
Synthesizer Module to be individually assembled and tested. This facilitates construction, tuning,
maintenance as well as troubleshooting procedures. The synthesizer module can be programmed to
have up to 16 channels exclusive to one frequency band.
The VT-3 132 - 174 MHz Transmitter is designed to interface with Daniels Electronics' MT-3
Repeater System while maintaining MT-2 System compatibility. Both repeater systems are
characterized by dependable, low maintenance performance under the most severe environmental
conditions.
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) and
3. assembly, setup and alignment procedures relevent to that particular module.
The module manuals are as follows.
Note: material presented in a given "sub-manual" may include information related to other module
versions not directly appllicable to the VT-3 132 - 174 MHz Transmitter family (eg, the OS-3H
Synthesizer Instruction Manual covers models from 29 MHz to 512 MHz).
VHF Enhanced Transmitter Instruction Manual: This manual provides an overview of the complete
transmitter, manual organization and assembly in terms of the other modules.
MT-3 Transmitter Main Board Instruction Manual: This manual pertains to the audio processor
module, transmitter Main Board and Front Panel Board. Most of the user selectable options are
accessed within the Transmitter Main Board module, including channel selection. Since all external
connections (including power and signal lines) are made to the Transmitter Main Board, most of the
material pertaining to transmitter operation and instal lation is found here.