This small construction is a 30dB power attenuator for use in frequencies from DC to 2GHz. Maximum input power is 250W. The attenuator is a BARRY A3000-250-4X. It is mounted on a copper heat spreader which has to be bolted on a proper heatsink for high power usage. The N type connector at the input and the BNC connector at the output are connected to the attenuator via 50 ohm microstips printed on ordinary FR4 substrate PCB.