a bandpass filter whose pass band is the standardized frequency band of a basic group
NOTE 1 – A through-group filter may be used to interconnect two consecutive group sections, where appropriate.
NOTE 2 – Similar definitions can be given for: "through-supergroup filter", "through-master group filter", "through-supermastergroup filter" and "through 15-supergroup assembly filter" or "through-hypergroup filter".
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