STAGE ANALYSIS, TRANSMIT SIGNAL PATHS

TM 11-5805-387-34-2

PAGE

STAGE ANALYSIS, TRANSMIT SIGNAL PATHS

Introduction ...............................................................................................................................................

1-24

Loop Battery Module A5 ............................................................................................................................

1-24

Dc-to-Ac Inverter and Current Regulator ...................................................................................................

1-26

Receive and Send Sensing Circuit ............................................................................................................

1-28

Switching Circuits......................................................................................................................................

1-30

Transmitter Module A3 ..............................................................................................................................

1-32

Mark and Space Oscillator Output Switching .............................................................................................

1-33

Mark and Space Oscillator Output Divider Circuits ....................................................................................

1-33

Mixer Oscillator and Switching ..................................................................................................................

1-35

Mixer Oscillator Output Divider Circuits.....................................................................................................

1-36

Sine Wave Pass Filter, Isolation Amplifier and Mixer ...............................................................................

1-36

Mixer Amplifier and Transmit Fsk/Nsk Filter Switching ..............................................................................

1-38

Transmit Voice Circuits .............................................................................................................................

1-39

Output Amplifying Circuits.........................................................................................................................

1-40

SECTION VII

STAGE ANALYSIS, RECEIVE SIGNAL PATHS

Introduction ...............................................................................................................................................

1-40

Receive Input Isolation Amplifiers .............................................................................................................

1-40

Receive Audio Module A1 .........................................................................................................................

1-41

Receiver Module A4..................................................................................................................................

1-42

Frequency Discriminator Circuits...............................................................................................................

1-44

Receive Mark-Space Pulse Generation, Stage Analysis ............................................................................

1-46

Diversity Switching ....................................................................................................................................

1-48

Mark Hold Switching .................................................................................................................................

1-50

Scope Module A2 ......................................................................................................................................

1-52

Intensity Squelching ..................................................................................................................................

1-53

Power Supply ............................................................................................................................................

1-53

SECTION VIII

POWER SUPPLY STAGE ANALYSIS AND SWITCHING

General .....................................................................................................................................................

1-54

Power Input and Transient Suppressor Stage Analysis ..............................................................................

1-54

+22 Volt Preregulator ................................................................................................................................

1-55

Twenty-Volt Regulator ...............................................................................................................................

1-55

Operational Control Circuits ......................................................................................................................

1-56

85- Hz Operation.......................................................................................................................................

1-57

Voice Operation ........................................................................................................................................

1-57

85 -Hz Diversity Operation ........................................................................................................................

1-58

85 Hz + Voice Operation ...........................................................................................................................

1-58

SECTION IX

METERING STAGE ANALYSIS AND SWITCHING

General .....................................................................................................................................................

1-59

Metering Circuitry ......................................................................................................................................

1-59

1-2