cai.org.uk

Website:https://www.cai.org.uk/
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Definitions (163)

1

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BER


Bit Error Ratio.
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Bér


Bit Error Ratio.
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braid


The interwoven outer conductive layer of coaxial cable made up of several bare conductors coming together to form a solid or nearly solid layer or shield. Braid is rated by percentage of coverage and by pixels per inch. Pixels per inch indicate the number of crossings of the braid in one inch of cable.
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diplexer


A frequency-conscious device for combining or splitting signals in different frequency bands. A diplexer has a lower insertion loss than the equivalent splitter.
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Encryption


A method of encoding a signal so that it is unwatchable without the correct compatible decoding equipment. Encrypted signals are usually reconstructed using a decoder and smart card.
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QAM


Amplitude is a method of combining a number of amplitude-modulated AMsignals into a single channel, thereby increasing the effective data rate. There are many versions from 4 QAM to 512 QAM. QAM is used with in digital systems, especially in wireless applications.
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Balun


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.
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Bandwidth


The total range of frequencies occupied by a signal. It is normally measured between half-power points.
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Baseband


The band of frequencies containing information after demodulation.
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Beamwidth


An aerial acceptance angle measured between half- power points.
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