22 khz tone
The signal generated by a satellite receiver and relayed to an LNB to select the 'high' oscillator.
'Asynchronous Digital Subscriber Loop'
A circuit that increase the power or voltage of a signal.
A transmittion system in which the modulating waveform is made to vary the the carrier amplitude.
A mode of transmission of information. An analogue waveform has a physical similarity with the quantity it represents.
A device used to transmit or receive radio waves.
The ratio of width to height for a TV screen.
The trade name for satellites operated by SES ('societe Europeenee des Satellits').
A passive device that decreases signal power.
A compass bearing East or West of true South.
A balance to unbalance transformer (sometimes an integral part of an aerial) used to match an unbalanced coaxial cable to a balanced device such as an aerial dipole or receiver input.
A circuit that passes a restricted band of frequencies. Unwanted lower and upper frequencies are attenuated.
The total range of frequencies occupied by a signal. It is normally measured between half power points.
The band of frequencies containing information after demodulation.
An aerial acceptance angle measured between half power points.
A binary digit (a 1 or 0).
Bit error ratio (BER)
A ratio of the number of errors in a data stream to the total number of data bits.
The number of digital bits transmitted per second.
The relationship between the energy of a particle and its motion is related to its absolute temperature multiplied by Boltzmann's constant, which has a value of -228.6dB. This very small factor exerts a powerful influence on the effects of noise and thus quality.
The principle center axis of an aerial or dish antenna.
A number of programmes grouped within a multiplex.
British Sky Broadcasting.
BSS (Bus. Satellite Services)
The band of frequencies 11.7-12.5ghz.
A group of 8 digital 'bits'.