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 TM 11-6625-2975-40
The test set is a microprocessor-controlled signal generator that produces modulated rf signals for
use in testing VOR, localizer, glide slope, and marker beacon receivers. it consists of the following
major assemblies:
1.
Front panel assembly A1
2.
Controller/audio assembly A2
3.
Rf modulator assembly A3
4.
Synthesizer assembly A4
5.
Power supply assembly A5
6.
Chassis assembly A6.
E L9LY004
The heart of the test set circuitry is a microprocessor, which controls the test set's internal functions
through a control bus. The microprocessor is part of controller/audio assembly A2. This assembly
also contains memory circuits and an audio generator. The microprocessor uses the control bus to
apply Instructions from the memory circuits to the audio generator. The audio generator produces the
signals required to modulate the rf carrier.
Front panel assembly A1 includes the operator's keyboard and the digital displays that depict the
operator-selected data. This assembly processes keyboard entries as instructed by the micro-
processor, through the control bus.
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