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Telegraphy ; text based modes. Includes morse and RTTY.
Thermionic Valve : (Also known as an Electron Tube or a Vacuum Tube). A device that creates or modifies an electrical signal through the movement of electrons in a low pressure (vacuum) space.
THROB : An MFSK digital mode based on tone pairs.
TNC : Terminal Node Controller - a device used in packet radio that disassembles and re-assembles packets of data.
TOR (Teleprinting Over Radio): Used in three digital modes; AMTOR, PACTOR and G-TOR.
Toroid : A donut-shaped solid usually constructed of ferrite, used as the former for transformers and inductors'
Transceiver : A radio that has both a transmitter and a receiver, which either share common circuitry or a common housing or both.
Transient : A short spike or trough on a power line, usually lasting for a few microseconds.
Tuned Circuit : A capacitor and an inductor, usually in parallel. The circuit responds strongly at its resonant frequency and is used to select or tune in wanted signals.
TVI : Interference to television reception.
TX : Abbreviation for transmit or transmission