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Section II. EQUIPMENT DESCRIPTION AND DATA
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TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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TRANSMIT SIGNAL PATH
TM 11-5805-387-34-2
1-13. REFERENCE DESIGNATIONS AND ABBREVIATIONS
Assembly numbers identify the modem's modules and subassemblies.
A1
Receive audio module
A2
Scope module
A3
A4
Receiver module
A5
Loop battery module
A6
Signal filter subassembly
A7
Meter bias subassembly
A8
Loop connectors filter subassembly
A9
Preregulator subassembly
Similar designators identify module subassemblies:
EXAMPLE: Subassembly A2 of transmitter module A3 is designated A3A2.
Abbreviations of component and subassembly parts complete the full reference designation:
EXAMPLE: Capacitor C1 on subassembly A3A2 is designated A3A2C1.
Section III. TECHNICAL PRINCIPLES OF OPERATION
1-14. GENERAL
The modem consists of a transmit signal path, a receive path, and an associated metering and power supply circuitry.
When the modem is set up for transmit operation, it converts dc mark and space pulses produced by tty equipment into
mark and space tones, which can be transmitted by radio, or over landlines. In voice modes of transmit operation, the
modem combines voice signals with tty (mark and space) tones for simultaneous transmission. The simplified transmit
block diagram is discussed in paragraph 1-15.
When the modem is set up for receive operation, receive mark and space tones are converted into mark and space
pulses suitable for operating receive tty equipment. In voice modes of receive operation, the modem separates voice
signals from tty tones so that simultaneous reception of tty and voice messages is possible. The simplified receive block
diagram is discussed in paragraph 1-16.
The power supply consists of a preregulator, a regulator, and various dc-to-dc inverters that are required to produce the
currents and voltages necessary for operation of the modem. The power supply simplified block diagram is discussed in
Metering and monitoring is accomplished by a front panel meter, a scope, and aural monitoring through headphones or
a monitor speaker. Metering circuitry is discussed in paragraph 1-18.
1-5

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