Raytheon QKL1631-A3 Master Oscillator CWI

CWI = Continuous Wave Illumination.
NAVORD (Naval Ordnance) No. 3232335-3
NSN (NATO Stock Number): 5960-01-174-5573
Part alternate: VTS-3
Oscillator frequency: 9,342.62 MHz

This tube was a spare part for the F911 Westdiep frigate of the Belgian Navy.

Many thanks to Danial Stocks for the following information: “This is one of the lowest noise oscillator klystrons ever made. The big cylinder is a temperature compensated high-Q cavity used to reduce the noise from the klystron output. It is about 0.5  - 1 W output and runs at about 4 kV. This generates a low noise signal that is amplified by another high power klystron used as illuminator for an anti-aircraft missile. The missile tracks the reflection of the illuminator signal from the aircraft. The noise must be as low as possible, as this is the limit to what the missile can track.

These klystrons are used in MK91 Fire Control System, which is a shipboard radar associated with various missiles, I think the Sea Sparrow is the main one.

Here is the data sheet for the Varian VKX-7017, which is equivalent, if I recall correctly.”

 

L x l x H: 184 x 146 x 142 mm • 7" 1/4 x 5" 3/4 x 5" 9/16

 

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