GMDSS: Element 3

1. A Coupling device that is used in the transition from a rectangular waveguide to a circular waveguide.
2. B Electronic switch that allows the use of one antenna for both transmission and reception.
3. C Modified length of waveguide that is used to sample a portion of the transmitted energy for testing purposes.
4. D Dual section coupling device that allows the use of a magnetron as a transmitter.

Tip: press A-D to answer