TM 11-7440-232-12/NAVELEX 0967-LP-275-5010
Section II. EQUIPMENT DESCRIPTION AND DATA
1-8. EQUIPMENT PURPOSE, CHARACTERISTICS, CAPABILITIES, AND FEATURES
Purpose of MD-701(*)/UY
Modulator-demodulator for transmitting and receiving serialized digital data at 600, 1200, or 2400 bits per second
over a standard 3-kHz voice channel.
Capabilities and Features
Major Electronic System Components
a. Solid State Components
1. Power Supply
2. Transmitter
3. Transmitter Clock
4. Receiver Line Filter
5. Adjustable Equalizer
6. Limiter Discriminator
7. Decoder Error Detector
8. Digital Receiver Clock
9. Data Carrier Alarm
Modular construction
Fail-safe alarm
RFI shielding
Built-in self testing
b. MD-701B/UY is one-way interchangeable with Digital Data Modem MD-701/UY and MD-701A/UY. MD-701B/UY
performs the same function as Digital Data Modem MD701A/UY, and in addition, provides a RFI shielded modem shelf.
c. Digital Data Modem MD-701B/UY has one observable indicator light on the front cover labeled POWER. Digital
Data Modem MD-701/UY and MD-701AIUY have two observable indicator lights on the front cover labeled POWER and
ERRORS.
1-9. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS
a. The major components of the Digital Data Modem MD-701(*)/UY are a rackmounted modem shelf, a power
supply, nine plug-in PCC modules, a shelf-mounted RF oscillator, and a module extender.
b. The location of plug-in modules, operating controls, and test pin-jacks is shown on a decal on the inside of the
front cover of the modem shelf.
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