- speech compression
- speech current
- speech generation
- speech period
- speech service
- speech volume
- speed dialing
- spherical reflector
- SPHERICAL SECTOR
- spheroidal triangle
- speckle noise
- spectral band
- spectral interference
- spectral occupancy
- spectral signature
- spectrum distribution
- speech band
- speech circuit
- speech coding
- speech connection
- speech path
- spherical antenna
- spherical coordinate
- spherical diffraction
- spiderweb antenna
- spike antenna
- Spillover
- spillover loss
- spin
- spin-axis
- spike
- spin pack
- spin stabilization
- spiral waveguide
- spliced rope
- splied cable
- splitting arrangement
- spread echo
- spread F
- spurious
- spurious emission
- spurious level
- spurious radiation
- spurious signal
- square loop
- square root
- splashdown
- split key
- split screen
- sporadic interference
- spot detector
- spot measurement
- SSB operation
- SSB power
- stabilization factor
- stabilized data
- stabilizing cavity
- stabilizing device
- stable field
- stable memory
- stable oscillator
- staff council
- staff evaluation
- stage disconnect
- standard antenna
- standard costs
- Standard deviation
- standard frame
- standard frequency
- standard functions
- standard illuminants
- standard input
- standard MUF
- standard oscillator
- standard propagation
- standard refraction
- standard target
- standard value
- standard waveguide
- standards conversion
- standards converter
- standby
- standby computer
- standby condition
- standby redundancy
- standby register
- standby time
- star configuration
- star distribution
- star mapper
- star quad
- star sensor
- star structure
- star telescope
- star tracker
- spray point
- sprayed propellant
- spread
- spread card
- spur