Accession Number:

ADA064377

Title:

VHF Data Modem/Baseband Data Signal Converter.

Descriptive Note:

Final rept. 30 Sept 76-28 Apr 78,

Corporate Author:

SIGNATRON INC LEXINGTON MASS

Personal Author(s):

• Ehrman,Leonard
• Mahoney,Paul F.
• Michalik,Michael
• Westerberg,Roy

Report Date:

1978-05-01

Pagination or Media Count:

156.0

Abstract:

A full duplex data modem, used for transmitting digital data over tactical VHF FM radios, has been designed and built. The modem has two operating modes. In the quasi-analog mode it can transmit at 75, 150, 300, 600, 1200, 2400, and 4800 bps, using binary FSK, MSK, and four-level FSK. In the X-mode it can transmit at 300, 600, 1200, 2400, 4800, 9600, and 16000 bps, using Manchester, conditioned, diphase, pair-selected ternary, delay modulation, bipolar, and twinned binary codes. This report contains the theory of operation, implementation, and test data on two units. Author

Descriptors:

• *RADIO RECEIVERS
• *MODEMS
• *TACTICAL COMMUNICATIONS
• SIGNAL PROCESSING
• DIGITAL SYSTEMS
• DATA TRANSMISSION SYSTEMS
• FREQUENCY MODULATION
• VERY HIGH FREQUENCY
• SCHEMATIC DIAGRAMS
• INFORMATION PROCESSING
• CODERS
• FREQUENCY SHIFT KEYERS
• FREQUENCY CONVERTERS

Subject Categories:

• Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE