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Line 4: ==Single channel systems== In a single -channel communication system the deamplification and loss present on them can be simplistically taken as attenuation by a percentage ''g'', then amplifiers restore the signal power level to the same value at transmission setup by operating at a gain of 1/ (1 − ''g''). E.g. if we experience 6 dB attenuation in transmission, i.e. 75% loss, then we have to amplify the signal by a factor of 4''x'' to restore the signal to the transmitter levels. ==Multichannel systems==

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