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 TB 43-0117
MD-522A/GRC
mission and reception, and duplex (simultaneous)
1.
Brief Description: Radio Teletypewriter Modem
transmission and reception. The modulator section of
MD-522A/GRC is a transistor modulator- demodulator
the modem accepts current pulses in a standard code
used with but not part of the Radio Teletypewriter
from a sending teletypewriter and converts them into
System installed on Army water- craft.
The MD-
audio tones. These tones are applied to an external
522AIGRC permits transmission and/or reception
exciter for transmission.
The demodulator section
(transception) of teletypewriter data and voice
accepts audio tones from an external receiver and
communications. Modes of operation include frequency
converts them into current pulses, which operate a
shift keying (fsk), narrow shift keying (nsk), voice only,
receiving teletypewriter. Input power requirement is 27
frequency diversity and nsk plus voice.
The fsk
volts DC at 1.4 amperes.
operation uses a 2,000 Hz center frequency, and nsk
operation uses a 2,805 Hz center frequency. Frequency
2.
Applicable Tools and Test Equipment: See
diversity operation utilizes a second nsk center frequency
of 425 Hz. Type of operation provided are one-way
Appendix B for nomenclature, NSN, etc.
reversible trans-
Type No.
O
F
H
AN/UGM-1
Test Set, Teletypewriter
X
X
AN/URM-105C
X
AN/URM-127
Generator, Signal
X
X
AN/URM-145
Voltmeter, Electronic
X
X
AN/USM-207A
Counter, Frequency
X
X
AN/USM-223
X
X
AN/USM-281A
X
X
H-33/PT
Handset
X
X
ME-26D/U
X
X
ME-30A/U
Voltmeter, Electronic
X
X
PP-3940A/G
Power Supply
X
X
TK-100/G
Tool Kit, Electronic
X
X
TK-101/G
Tool Kit, Electronic
X
TK-105/G
Tool Kit, Electronic
X
X
3.
Applicable Publications:
TM 11-5805-387-15-2
TM 11-5805-387-20P-2
TM 11-5805-387-34P-2
49
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