CPC Subgroup
H04B 7/155 Ground-based stations (H04B7/204 takes precedence)
Full Title
Radio transmission systems, i.e. using radiation field (H04B10/00, H04B15/00 take precedence) > Relay systems > Active relay systems > Ground-based stations (H04B7/204 takes precedence)
8 direct subcodes
Child Classifications
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- H04B 7/165 employing angle modulation
- H04B 7/17 employing pulse modulation, e.g. pulse code modulation