The E1430 - later the CV89 and CV79 - is a split anode magnetron for generating around 200 mW at 4.762 GHz (CV89). The CV79 production version of this magnetron operates at a lower frequency than the CV89. They were used in Wireless Set 10 MK.I transmitters for eight channel telephone systems. These provided line of sight communications and were employed in the D Day landings in 1944.
The glass at the base is 32 mm in diameter.
The cathode is horizontal and the split anode can be seen through the side cheeks.
The coiled heater can be seen clearly on the left of the image.
The cathode is oxide coated in the centre. The fingers of the two anodes are pressed from the side cheeks and interleave.
The construction is quite simple but has to be made with high precision to achieve the required frequency of operation. Like most system with magnetron transmitters the receiver local oscillator has to be the variable frequency element.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9G base pins, is 75 mm tall.
