TM  11-5820-890-30-4 Section I. ABBREVIATIONS. Continued Abbreviation RMS RMT ROD ROM RPSTL RT RTN RV RXMT S S SC SCOPE SEC SEL SEQ SH SIG SIG STR RCV SINCGARS SNAP SP SPD SPKR SQ SRCU SRM ST STBY STIM STO STR STW SW SYNC SYS T TAMMS TB TCXO TD TDCT E-4 Description Root  mean  square Remote Report  of  Discrepancy Read  only  memory Repair  parts  and  special  tools  list Receiver-transmitter Return Receive variable Retransmit Source  (electron  device) Switch Single channel Oscilloscope Second Select Sequential Sheet Signal Signal  strength  receive Single  channel  ground  and airborne  radio  system Steerable  null  antenna  processor Speed Speed Speaker Squelch Securable  remote  control  unit Single  radio  mount Sidetone Standby Stimulus Store Strobe Stow Switch Synchronize System Transformer The  Army  maintenance management  system Terminal  block Temperature   compensated crystal  oscillator Time delay Transmit  data  cypher  text Abbreviation TDR TEK TF TM TMDE TOD TOE TP TR TRANSEC TREE TRIG TRK TST U/M UUT V VAR VCC VCO VCXO VlC VlO VMOS VOL VR VS VSO VSWR W W WB WHSP WHT XMT YEL Z Z-A Z-FH Description Transportation  Discrepancy Report Transmission  encryption  key TACFIRE Technical Manual Test  measurement  and  diagnostic equipment FH  sync  time  (time  of  day) Table  of  organization  and equipment Test point Transmit-receive Transmission  security Transient  radiation  effect  on electronics Trigger Track Test Unit  of  measure Unit  under  test Voltage  base Variable Voltage  controlled  capacitor Voltage  controlled  oscillator Voltage  controlled  crystal oscillator Variable  instruction  computer Violet Vertical MOS Volume Voltage  regulator Variable  select Variable  select  zero Voltage  standing  wave  ratio Watt Wire Wideband Whisper White Transmit Yellow Zero Zero all Zero-frequency   hopping