Laboratory Tests of a Data Link Modem.
Final rept. Oct-Nov 74,
NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J
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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 SN ratios at the data rates of 2400 and 4800 bitssecond bs. 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 SN ratios used, within a plus or minus 1-dB SN tolerance.
- Radio Communications