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2.4 Recommended Test Equipment List

Alignment of the transmitter requires the following test equipment or its equivalent.
Dual Power Supply:
Oscilloscope / Multimeter:
Current Meter:
Radio communications test set:
VSWR 3:1 mismatch load:
Alignment Tool:
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.

2.5 Repair Note

The VT-3A130 Transmitter 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 disordering tools when removing jumpers. This will help prevent damage to
the circuitboards.

2.6 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.
DANIELS
DE
ELECTRONICS
2-4
Regulated +9.5 Vdc at 2 A
Regulated +13.8 Vdc at 2 A - Topward TPS-4000
Fluke 97 Scopemeter
Fluke 75 multimeter
Marconi Instruments 2955R
JFW 50T-035-3.0:1
Johanson 8766
VT-3A130VHF AM Transmitter Instruction Manual