OVERALL OPERATION

TM 11-6625-2976-40

1-13. GENERAL. (CONT)

OVERALL OPERATION

Two rechargeable internal batteries supply operating voltage to test set circuits. The battery check

circuit, when activated, indicates whether or not batteries need recharging. The front panel controls

select the test set's operational mode by:

1. Providing a path for operating voltage through circuit card assembly A6 to selected rf modules.

2. Controlling the input frequencies provided by circuit card assembly A6 for appropriate rf

modules.

The logic and control circuitry in circuit card assembly A6 directs and applies operating voltage to rf

modules selected by the control panel switch settings. This circuitry also generates modulation

signals used by rf modules to develop appropriate rf frequencies.

The test set contains five rf modules, as follows:

MB RF Module A1

GS/UHF RF Module A2

GS/NHF RF Module A3

LOC RF Module A4

VOR RF Module A5

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