鎖相環四相相移鍵控 PLL-QPSK, phased-locked loop quadrature phase shift keying
T
塔臺 tower aeronautical station
特權（同步）網 oligarchic (synchronized) network
特征頻率 characteristic frequency
特種移動通信系統 particular mobile communication system
梯形調制（梯調） trapezoidal modulation
天波（電離層波） sky wave
天波路徑損耗 sky-wave path loss
天波時延 sky-wave delay
天電 atmospherics
天然氣候試驗 natural climate test
天線 antenna (aerial)
天線波束 beam of an antenna
天線帶寬 bandwidth of an antenna
天線額定電壓 antenna voltage rating
天線額定功率 antenna power rating
天線方向性圖 antenna directivity diagram
天線極化 polarization of an antenna
天線間的隔離度 isolation between antennae
天線匹配裝置 antenna matching device
天線收發開關 T-R switch
天線增益 antenna gain
天線自動調諧 antenna automatic tuning
調度電話 dispatcher telephone system
調度臺 dispatcher station
調幅電報 amplitude modulation (AM) telegraph
調幅電臺 amplitude modulation (AM) station
調幅度不對稱性 asymmetry of AM envelope
調幅發射機 amplitude modulation (AM) transmitter
調幅躁聲 amplitude modulation (AM) noise
調諧放大器 tuned amplifier
調頻 frequency modulation (FM)
調頻發射機 frequency modulation (FM) transmitter
調頻無線電話機 FM radio telephone
調頻躁聲 frequency-modulation noise
調相 phase modulation (PM)
調諧 tuning
調諧線性 linearity of tuning
調諧指示器 tuning indicator
調整碼位（塞入碼位） justifying digit (stuffing digit)
調整指示碼位（塞入指示碼位） justification service digits
調制 modulation
調制交流聲 modulation hum
調制解調器 modem
調制靈敏度 modulation sensitivity
調制器 modulator
調制深度 modulation depth
調制特性 modulation characteristic
調制限制 modulation limiting
調制指數 modulation index
跳（電離層傳播） hop (ionospheric propagation)
跳距 skip distance
跳頻 frequency hopping (FH)
跳時 time hopping (TH)
跳周 cycle-skipping
跳周平均時間 cycle-skipping average time
貼片機 chip mounter
鐵路編組站自動化 automation of railway yard
鐵路列車調度系統 railtrain dispatch system
鐵路行車指揮自動化系統 automation for railway traffic control
鐵氧體天線 ferrite antenna
停播建立呼叫 off-air call set up
停閃頻率，臨界閃變頻率 flashing frequency, critical flicker frequency
通用移動通信系統 universal mobile communication system (UMTS)
通播 announcement call
通斷鍵控 on-off keying (OOK)
通信 communication
通信安全 communication security
通信衛星 communication satellite
通信衛星覆蓋范圍 communication satellite
通信衛星轉發器 communication satellite coverage
通信系統模型 communication system model
通信線路品質評分 circuit merit rating
通用個人通信 universal personal telecommunication
通用個人電信號碼 universal personal telecommunication number (UPTN, OTN)
通用平滑調頻 generalized tamed frequency modulation (GTFM)
同步 synchronization
同步保持時間 synchronization hold-in time
同步帶 hold-in range
同步的 synchronous
同步數字系列 synchronous digital hierarchy (SDH)
同步通信衛星 synchronous communication satellite
同步突發 synchronous burst (SB)
同步網 synchronization network
同步衛星 synchronous satellite
同步壓擴 synchronized compression and expansion
同頻（信）道電臺 co-channel station
同時單音順序制 simultaneous tone sequential system
同時單音制 simultaneous tone system
同軸電纜 coaxial cable
同軸電纜載波電話 coaxial cable carrier telephone
同軸線表面轉移阻抗 surface transfer impedance of a coaxial line
統計通信理論 statistical communication
透明帶內導頻單邊帶 transparent tone-in-band (TTIB) single sideband
突發 burst
突發長度 burst length
突發性 burstiness
突發業務 burst traffic
圖文廣播 broadcast videography
圖文視傳 videography