DIFF Subgroup
H04B 7/15 Active relay systems
Introduced: July 1974
Full Title
Full titles differ between systems:
IPC:
Radio transmission systems, i.e. using radiation field > Relay systems > Active relay systems
CPC:
Radio transmission systems, i.e. using radiation field (H04B10/00, H04B15/00 take precedence) > Relay systems > Active relay systems
IPC and CPC are identically structured here. All 3 subcodes exist in both systems.
2 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1974.
Child Classifications
Navigate with arrow keys, Enter to open
- H04B 7/155 Ground-based stations (H04B7/204 takes precedence) since 1974 +6 CPC IPC+CPC Available in IPC and CPC
- H04B 7/185 Space-based or airborne stations; (H04B7/204 takes precedence) since 1974 +8 CPC IPC+CPC Available in IPC and CPC