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Chapter 1. INTRODUCTION
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TM-11-5805-387-20-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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FIGURE 1-1. MODEM: TYPICAL CONFIGURATION FOR DUPLEX RADIO TELETYPEWRITER  SYSTEM
TM 11-5805-387-20-2
1-7. NOMENCLATURE CROSS-REFERENCE
OFFICIAL NOMENCLATURE
COMMON NAME
Modem
Modem Radio Teletypewriter MD-522A/GRC
NOTE
Official nomenclature must be used when filling out report forms onlooking
up technical manuals.
Section II. EQUIPMENT DESCRIPTION AND DATA
1-8. EQUIPMENT CHARACTERISTICS, CAPABILITIES AND FEATURES
Refer to Operator's Manual TM 11-5805-387-10-2.
1-9. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS
Refer to Operator's Manual TM 11-5805-387-10-2.
1-10. EQUIPMENT DATA
Refer to Operator's Manual TM 11-5805-387-10-2.
1-11. SAFETY, CARE AND HANDLING
Observe all WARNINGS, CAUTIONS and NOTES in this manual. This equipment can be extremely
dangerous if these instructions are not followed.
Section III. TECHNICAL PRINCIPLES OF OPERATION
1-12. TECHNICAL PRINCIPLES OF OPERATION
When the modem is used as part of a radio teletypewriter system (fig. 1-1), its modulator section
accepts current pulses in a standard code from a sending teletypewriter and converts them into audio
tones; its demodulator section receives audio tones from an external source and changes them into
current pulses which operate a receiving teletypewriter. As part of a landline teletypewriter system
(fig. 1-2), the modem functions the same as described above. However, incoming and outgoing signals
can be received from, or applied to, telephone isolation amplifiers rather than radio equipment. As part
of a pony circuit setup (fig. 1-3), the modem provides teletypewriter communications between the local
receiving teletypewriter base and a remote (pony) teletypewriter.
NOTE
See TM 11-5805-367-34-2 for more extensive explanations on principle
of operation.

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