Daniels Electronics Ltd. MT-3 Instruction Manual - Page 11

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2.3 Transmitter Assembly and Alignment

All modules are mounted on the Transmitter Main Board, which then forms a single assembly. An
enclosure is formed by an extruded aluminum shell that slides over the Transmitter Main Board (as
illustrated in section 3.2). This shell also serves as a heatsink to remove heat from the Amplifier
module and for this reason, it is important that the four screws that bond the shell to the amplifier
module (Screws B in Section (3-2)) be installed before prolonged operation of the transmitter.
Moreover, the surface of the Amplifier module that contacts the shell should be clean and free of
foreign material. The enclosure is completed by the installation of front and rear plates, which are
fastened to the Transmitter Main Board (see Transmitter Main Board Manual for parts lists).
Transmitter alignment is performed on a module by module basis and detailed steps are provided in
the respective manuals. Alignment is simplified by using a SR-3 Subrack, SM-3 System Monitor,
and RF extended cable to provide transmitter power and signal interconnection. Alternatively,
+9.5 Vdc and +13.8 Vdc, as well as any required test signals may be applied directly to the
individual modules. Refer to the corresponding manuals for details.

2.3.1 Complete Transmitter Alignment

A complete Transmitter Alignment is performed at the factory and should not be required under
normal circumstances. This operation requires that all the transmitter modules be aligned on a per
module basis in the following order.
Sequence
(1)
(2)
(3)
(4)

2.3.2 Output Power Adjustment

The RF power output of the amplifier is to set to its rated value of 4.0Watts +/- 1dB at the factory
in the middle of the frequency range 118 MHz - 138 MHz. This should not require adjustment
under normal circumstances. However, should it be necessary to correct the output power, the
Output Power Adjustment, which is described in the Amplifier Manual can be adjusted
accordingly.
DANIELS
DE
ELECTRONICS
VT-3A130 VHF AM Transmitter Instruction Manual
Module
Transmitter Main Board
Synthesizer Module
Amplifier
Audio Processor
Manual Reference
section 2.2 of
Transmitter Main Board
Synthesizer Module
Amplifier
Transmitter Main Board
2-3