Accession Number : ADA017065

Title :   Laboratory Tests of a Data Link Modem.

Descriptive Note : Final rept. Oct-Nov 74,

Corporate Author : NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J

Personal Author(s) : Bilello,Joseph A.

Report Date : SEP 1975

Pagination or Media Count : 24

Abstract : The report evaluates the performance of two minimum shift key (MSK) modulation modems designed for a very high frequency (vhf) data link communications. Tests consisted of determining the probable bit error of two modems in a loop-around mode for each modem and then in a back-to-back mode between the two modems. For each of these two test conditions, the modems were subjected to various signal-to-noise (S/N) ratios at the data rates of 2400 and 4800 bits/second (b/s). Each test was terminated after 800 bit errors were accumulated, except for those test runs where the modem was running essentially error free, the test period was limited to a 24-hour period. Results indicated that the performance of each modem was the same over the S/N ratios used, within a plus or minus 1-dB S/N tolerance.

Descriptors :   *Modems, Data links, Laboratory tests, Very high frequency, Digital systems

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE