TWTA - Travelling Wave Tube Amplifier. A wideband microwave amplifying device in which power is added to a carrier as it propagates down a tube. Three Axis Stabilization - A system of satellite stabilization in which its axes remains fixed with respect to earth. Thrusters - Devices in which propellant is burnt, or disintegrates, to produce a controlled force in a selected direction. Transaction Reservation - A means of sharing the inbound space capacity of a VSAT network.
Senders can reserve a slot before sending.
The orbit of a satellite between the firing of the Perigee Kick Motor and the firing of the Apogee Kick Motor. Transponder - Satellite equipment that receives signals on the uplink, translates them to the downlink frequency, and amplifies them for retransmission to earth. Transponder Hopping - The same as frequency hopping. V VDI - Voice, Data and Image. VSAT - Very Small Aperature Terminal.