Instruction Manual

DE
DANIELS
ELECTRONICS
VT-3A130 Amplifier Instruction Manual 3-1
3 VT-3A130 AMPLIFIER ALIGNMENT
3.1 General
Connections to the power supply, audio input and transmit enable line are clearly marked on the
amplifier case. The amplifier is enabled when the enable line (AMPLIFIER ENABLE pin) is
grounded.
If the amplifier is installed in the transmitter, alignment is simplified by using the SR-3 Subrack,
SM-3 System Monitor, and RF extender cable to provide transmitter power and signal
interconnection (see the Transmitter Main Board Manual for details). For complete transmitter
alignment, the Transmitter Main Board, Synthesizer, Amplifier, and Audio Processor should be
tuned in the aforementioned order. Please refer the corresponding manuals for each module.
3.2 Repair Note
The VT-3A130 Amplifier is mainly made up of surface mount devices which 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 Dissipative (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.
3.3 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.