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The CV2311 is an X-Band TR switch used to protect the sensitive receiver front end from the radar transmit pulse. Operation is around 9-10 GHz.

The KB/RB identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the RB identifies the maker as Ferranti, Dundee.

The connections are via a WG16 flange that is 41 mm square. The TR switch contains a low pressure gas and so the waveguide is sealed at either end.

This appears to suggest twin gaps.

Looking at the broad face of the waveguide with the connections on the right.

Serial number 24840.

Reference: Observation.