DE
DANIELS
ELECTRONICS
2-10
UT-4B400 P25 Digital UHF Base Transmitter Instruction Manual
2.6
Recommended Test Equipment List
Alignment of the transmitter requires the following test equipment or its equivalent.
Dual Power Supply:
Reg9.5 Vdc at 2 A.
Reg13.8 Vdc at 2 A - Topward TPS-4000
Oscilloscope / Multimeter:
Fluke 97 Scopemeter
Current Meter:
Fluke 75 multimeter
Radio communications test set :
Marconi
Instruments
2955R
(analog
only)
Motorola R2670 with Project 25 option
Alignment Tool:
Johanson 4192
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.
2.7
Repair Note
The transmitter is mainly made up of surface mount devices that should not be removed or replaced
using an ordinary soldering iron. Removal and replacement of surface mount components should
be performed only with specifically designed surface mount rework and repair stations complete
with ElectroStatic Discharge (ESD) protection.
When removing Surface Mount Solder Jumpers, it is recommended to use solder braid in place of
manual vacuum type desoldering tools when removing jumpers. This will help prevent damage to
the circuit boards.
2.8
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 43-9120
10
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.
