There are 0 pins on this high power RF circuit board.The Evaluation board type is Mixer.Try searching with HMC423 to find RF Board variants.The mount is attached to PCB.
105190-HMC423MS8 Features
0 pins Mixer Type
105190-HMC423MS8 Applications
There are a lot of Analog Devices Inc. 105190-HMC423MS8 RF Boards applications.