asiasat.com.hk

Website:https://www.asiasat.com/
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Definitions (268)

1

1   1

ber


See Bit Error Rate.
Source: asiasat.com.hk

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qam


Quadrature Amplitude Modulation. A method of combining two Amplitude Modulated (AM) signals - each having the same frequency, but differing in phase by 90 degrees, into a single channel, thereby doubling the effective bandwidth.
Source: asiasat.com.hk

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slant range


The length of the path between a communications satellite and an associated earth station.
Source: asiasat.com.hk

4

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vod


Video-On-Demand. System that allows the viewer to see or choose a programme at the time the viewer specifies.
Source: asiasat.com.hk

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access


The method of channel sharing or utilisation of a single frequency or time slot by several locations.
Source: asiasat.com.hk

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adaptive coding and modulation


ACM is a technology which can adjust the modulation and forward error correction or FEC of a link automatically to compensate the changes in link conditions (e.g. rain fade, level changes or interference). This technology is adopted in DVB-S2.
Source: asiasat.com.hk

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amplifier


A device used to increase the strength of electrical signals.
Source: asiasat.com.hk

8

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analogue


A form of storing, processing or transmitting information through a continuous variable (rather than pulsed) signal.
Source: asiasat.com.hk

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antenna control unit


The unit used for control and tracking the antenna pointing to the desired satellite
Source: asiasat.com.hk

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antenna


Device which picks up and delivers satellite signals to a receiver, most commonly a dish.
Source: asiasat.com.hk


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