Ship Radar Endorsement: Element 8

1. A Is applied to a TR tube to make it more sensitive.
2. B Partially ionizes the gas in a TR tube, making it very sensitive to transmitter pulses.
3. C Fully ionizes the gas in a TR tube.
4. D Is applied to a TR tube to make it more sensitive and partially ionizes the gas in a TR tube.

Tip: press A-D to answer