User's Guide

DE
DANIELS
ELECTRONICS
UHF Transmitter Instruction Manual UT-3 406 - 512 MHz 1-1
1 GENERAL
1.1 Introduction
The UT-3 406 - 512 MHz Transmitter is a synthesized FM transmitter capable of operating in 12.5
kHz or 25 kHz channels. The transmitter operates continuous duty in one of four frequency bands:
406 to 430 MHz, 450 to 470 MHz, 470 to 490 MHz or 490 to 512 MHz and its output power is
continuously adjustable from 0.5 T0 2.0 or 2.0 to 8.0 Watts. The transmitter is not to be operated
within the 406 to 406.1 MHz frequency band, unless specifically authorized by COSPAS/SARSAT
through the Federal Communications Commission and/or Industry Canada. A modular design
allows each of the transmitter's modules; MT-3 Transmitter Board, MT-3 Audio Processor, UT-
3/400 Amplifier, and OS-3H400 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 UT-3 406 - 512 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 UT-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 "submanual" may include information related to other module
versions not directly applicable to the UT-3 406 - 512 MHz Transmitter family (eg, the OS-3H
Synthesizer Instruction Manual covers models from 29 MHz to 512 MHz).
UHF Transmitter Instruction Manual UT-3 406 - 512 MHz: 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 installation is found here.