Section II. EQUIPMENT DESCRIPTION AND DATA

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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