The CV236 is a spark gap designed to short out the receiver input port of a radar set during the transmit pulse and thus protecting the delicate receiver.
The bulb is argon filled and the gap operates at S-Band at 3.3 GHz.
The reverse shows the gap. The TR switch would be located within waveguide.
Side view showing the glass to metal seal.
The wide glass tube envelope is 34 mm in diameter and is 31 mm tall.
