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TM 11-6625-2976-40
1-12. SAFETY, CARE, AND HANDLING.
Obey all Warnings, Cautions, and Notes in this manual. Failure to follow directions could result In
serious injury to personnel and/or damage to equipment.
Be careful not to drop the test set. Personal injury and damage to equipment could result.
Before operating the test set, make sure batteries are removed.
Before removing test set from its case, open the PRESSURE EQUALIZER valve (located on the bottom
of the case) to allow case atmosphere and pressure to balance.
When moving or operating the test set, take care to keep your eyes from coming in contact with the tips
of extended test set antennas.
NOTE
Aii maintenance procedures must be performed using external 8 vdc sources. If a
source is used besides the companion battery charger, the ramp test set batteries
must be removed or battery damage will result.
Section Ill PRINCIPLES OF OPERATION
Subject
Para
Page
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Check Capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modulating Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Modules and RF Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VAR Lamp Flasher Capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Charger Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-13. GENERAL.
The test set is a compact, portable, battery-operated uhf/vhf signal generator. Test set trans-
missions, which simulate VOR, GS, LOC, and MB ground station signals, are used to examine the
response of aircraft navigational systems.
This section covers the test set's electronic principles of operation. A general overview of major
components and their interrelationships is followed by details of power supply, modulation, and rf
signal flow application. This Is accomplished by discussing the relationship of major components
(power source, circuit card assembly, and rf modules) to front panel controls.
At the general support level of maintenance, electronic components within the test set's A6 circuit
card and rf modules are not replaced. Because of this maintenance approach, this section does not
discuss performance of specific components (diodes, transistors, etc). Instead, the text explains
how each subassembly contributes to the overall operation of the test set.
1-5

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