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CV101 "crystal valve" S-band mixer diode

 

Size This "valve" measures 20x7mm overall (~6mm across the main body)

This valve, actually a semiconductor diode, is designed to operate between 2500 and 6000 MHz.

Max operating frequency 6GHz
Min back to forward resistance ratio 8:1
Max forward resistance 265 ohms

The CV101 was the first of a range of such devices developed during WWII. See also CV102 and CV103.

Crystal valves were used in the mixers of radar receivers and were susceptible to burn-out caused by the high RF power of the transmitted pulse. It was for this reason that TR Cells were so vital in single-aerial operation, and also the reason for the development of thermionic diode mixers such as the CV58 and CV258.

See here for some equipment using a CV101 and a CV43 TR Cell

(Note: Yes I know it is a semiconductor, but as these crystal valves were so vital to radar and many of my other unusual valves are for radar too, surely this deserves to be an 'honorary valve'!)

CV101
CV101

This file was last modified 15:13:56, Tuesday September 02, 2014