FSCS Frequency Shift Communication System
shift frequency shift keying
WSCS Weapon System Communication System
ACOUSTIC EMISSION FREQUENCY SHIFT
Active radio frequency system
Analysis by frequency shift
Atmospheric Low-frequency system
audio frequency shift keying
audio frequency shift modulation
audio frequency shift modulator
Audio frequency-shift modulated track circuit
BCFSK Binary Code Frequency Shift Keying
benchmarking programbinary frequency shift keying
BFSK Binary Frequency Shift Keying
bidirectional power frequency communication