0 pins are on the high power RF circuit board.Input RF type Switch, SPDT of the Evaluation board.Using the HMC232 search parameter, you can discover variants of the RF Board.PCB is the one that mounts RF Board.
EV1HMC232ALP4 Features
0 pins Switch, SPDT Type
EV1HMC232ALP4 Applications
There are a lot of Analog Devices Inc. EV1HMC232ALP4 RF Boards applications.