- SACD
- SAME
- Sample Rate
- Satellite
- Satellite Antenna
- Satellite System
- Saturation
- S-band
- SCA
- Scan
- Scan, Wide
- Scanner
- Scanning, Conventional
- Scanning, Trunked
- Schottky Diode
- SCR
- Screw In
- Scrubbing
- SCS
- SCSI
- Scuff Cover
- Sd
- SD Card
- SDMI
- SDSL
- SDTV
- Sea Level
- Search Coil
- Search Coil Cable
- Search Engine
- Secondary
- Secondary Cell
- Secure Digital Music Initiative
- Secure Digital Card
- Self Discharge
- Semiconductor
- Semiconductor, n-type
- Semiconductor, p-type
- Sensitivity
- Sensor
- Sensor, CCD
- Sensor, CMOS
- Sensor, Hall Effect
- Sensor, Shock
- Separation
- Sepia
- Serial Bus
- Serial Port
- Series
- Service Band
- Service Maintenance Repeater
- Severe Weather
- Severe Thunderstorm
- Sextant
- Shareware
- Shelf Life
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- SHF
- Shield
- Shield, Faraday
- Shielded
- Short Circuit
- Short Message Service
- Shortwave
- Shunt
- Shutter
- Shutter, CCD
- Shutter, Digital
- Shutter, Focal Plane
- Shutter, Iris
- Shutter Lag
- Shutter, Leaf
- Shutter Speed
- SI
- Sibilance
- SID
- Sideband
- Sideband, Lower
- Sideband, Upper
- Sidetone
- Signal
- Signal Bridge
- Signal, Deep
- Signal, Faint
- Signal, False
- Signal Level
- Signal, Radio
- Signal to Noise Ratio
- Signal Width
- Silent Search
- Silicon-Controlled Rectifier
- Silver
- SIM
- Simplex
- Sine Wave
- Sine Wave, Modified
- Sine Wave, True
- Single In-line Package
- Single-lens Reflex
- Single Pole Double Throw
- Single Pole Single Throw
- Single Throw
- Sink
- Sintered-plate
- Sintering
- Sinusoidal
- SIP
- Site
- Skid Plate
- Skin
- Sleet
- SLR
- Slow-blow Fuse
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- Slow Motion
- Small Computer System Interface
- Smart Card
- SmartMedia™
- Smart Telephone
- Smiley
- Smoothing
- SMR
- SMS
- S/N
- SNR
- Snow
- Snow Advisory
- Snow Grains
- Snow Pellets
- Solar Panel
- Solder
- Solder, Silver
- Solenoid
- Solid Conductor
- Solid-state
- Solid State Floppy Disc Card
- Sound Card
- Sound Pressure Level
- SPDT
- Speaker
- Speaker Driver
- Specialized Mobile Radio
- Speed of Light
- Sphere
- Spindle
- SPL
- Splitter
- Splitter/Combiner
- Splitter, Passive
- Spot Metering
- Spread Spectrum
- SPST
- Squelch
- SSB
- SSFDC
- Stability
- Standard Atmosphere
- Standard-definition Digital Television
- Standard Surface Pressure
- Standby Charge
- Standby Time
- Standing Wave Ratio
- Star
- Start, Cold
- Start, Warm
- Statcoulomb
- Statement (Weather)
- Static
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- Static Electricity
- Statvolt
- Steady Pix™
- Step-down Transformer
- Step-up Transformer
- Stereo
- Storm
- Storm, Winter
- Stranded Conductor
- Stratiform
- Stratocumulus
- Stratopause
- Stratosphere
- Stratus
- Stratus Fractus
- Stream
- Stylus
- Subcarrier
- Subscriber
- Subscriber Identity Module
- Subsidiary Communications Service
- Subwoofer
- Subwoofer, Active
- Subwoofer, Passive
- Superheterodyne
- Super High Frequency
- Surround Material
- Surround Sound
- Surface Area
- Surface-barrier Diode
- Surface Microphone
- Surface Mount
- S-Video
- SVGA
- S-VHS
- Sweep
- Switch
- Switch, DPDT
- Switch, DPST
- Switch, Mercury-type
- Switch, Momentary
- Switch, Pushbutton
- Switch, Dry Reed
- Switch, Rocker
- Switch, Rotary
- Switch, Slave
- Switch, Slide
- Switch, Snap-action
- Switch, SPDT
- Switch, SPST
- Switch, Tactile Pushbutton
- Switch, Toggle
- SWR
- SWR Meter
- Sync
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