SAFETY, CARE, AND HANDLING. - TM-11-6625-2975-400014

TM 11-6625-2975-40

EQUIPMENT DATA. (CONT)

1-11.

SPECIFICATION

CHARACTERISTIC

Marker Beacon (MB)

<1.0 percent

Distortion (audio)

Amplitude modulation

Range

95.0 percent

Preset

Variable

90.0 to 97.0 percent, in 0.1-percent increments

5 percent

Accuracy

<4 percent

Tone distortion

1-12. SAFETY, CARE, AND HANDLING.

Be sure to obey all warnings, cautions, and notes given in this manual. Failure to follow directions

may result in serious injury to personnel and/or damage to equipment.

section Ill PRINCIPLES OF OPERATION

Page

Para

Subject

1-6

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

1-7

System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

1-9

1-15

Microprocessor (CPU) Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Front Panel Assembly Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

1-10

1-11

Audio Modulation Generator Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-17

1-13

RF Section Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-18

1-15

Power Supply Assembly Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

1-13. GENERAL.

This section contains information covering principles of operation of the major electronic assemblies

of the test set. The material is presented in functional block diagram format, with supporting text which

explains the operation of each assembly.

Details pertaining to the operation of individual components in each assembly are not discussed In this

section. Instead, the text is intended to explain how each assembly contributes to the operation of the

test set.

At the General Support level of maintenance, electronic components within test set assemblies are

not replaced. Because of this maintenance approach, this section does not discuss the performance

of specific circuits and components such as diodes, transistors, etc. In fact, it is not necessary to

understand how the circuits in an assembly operate to effectively troubleshoot or aline it. However, it

is very important to know what an assembly actually does in order to perform signal checks at test

points for the purpose of testing, troubleshooting, or alining the assembly.

A detailed system block diagram is found in FO-2 in the back of this manual. Refer to this foldout while

reading the following text.

1-6