C connector

C connector

C connector on the left beside smaller BNC
Type RF coaxial connector
DesignerCarl Concelman
ManufacturerVarious
DiameterMale:      0.750 in (1.91 cm)
Female:  0.600 in (1.52 cm)
(outer, typical)
CableCoaxial
PassbandTypically 0-11 GHz

The C connector is a type of RF connector used for terminating coaxial cable. Coupling uses two-stud bayonet-type locks. The C connector was invented by Amphenol engineer Carl Concelman. It is weatherproof without being overly bulky. The mating arrangement is similar to that of the BNC connector.

Picture to show the similarity between 50ohm and 75ohm C connectors