User's Guide

DE
DANIELS
ELECTRONICS
3-2 UHF Amplifier Instruction Manual UT-3 406 - 512 MHz
It is recommended that the radio communications test set be frequency locked to an external
reference (WWVH, GPS, Loran C) so that the high stability oscillator may be accurately set to
within its ±1 ppm frequency tolerance.
3.4 Printed Circuitboard Numbering Convention
To ease troubleshooting and maintenance procedures, Daniels Electronics Limited has adopted a
printed circuitboard (PCB) numbering convention in which the last two digits of the circuitboard
number represent the circuitboard version. For example:
• PCB number 43-912010 indicates circuitboard version 1.0;
• PCB number 50002-02 indicates circuitboard version 2.0.
All PCB's manufactured by Daniels Electronics are identified by one of the above conventions.
3.5 Standard Factory Settings and Jumper Configuration
The UT-3/400 Amplifier is factory configured as follows:
• Open collector configuration for Output Power Alarm (3 dB drop).
• Open collector configuration for Antenna VSWR Alarm (VSWR ≥ 3:1).
• Output power of 2 Watts or 6 Watts for low and high power amplifiers respectively.
The corresponding jumper settings are:
• Jumper JU1: not installed Output power alarm - linear output
• Jumper JU2: installed Output power alarm - open collector output
• Jumper JU3: installed Antenna VSWR alarm - open collector output
• Jumper JU4: not installed Antenna VSWR alarm - linear output
• Jumper JU5: installed Low power (2 W) transmitters
• Jumper JU5: not installed High power (8 W) transmitters
3.6 UT-3/400 Amplifier Alignment
3.6.1 GENERAL
The UT-3/400 Amplifier is a frequency sensitive module that is factory assembled to operate in one
of four frequency bands: 406 to 430 MHz, 450 to 470 MHz, 470 to 490 MHz or 490 to 512
MHz. The amplifier is available in a low power version, 0.5 to 2.0 Watts output power, and a high
power version, 2.0 to 8.0 Watts output power. Both amplifier versions require 5 dBm of input
power and in both versions the amplifiers output power is continuously adjustable over the its
respective power range. The UT-3/400 Amplifier provides Output Power and Antenna VSWR
Alarm outputs which can be configured for open collector output or linear operation. The