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Input atenuator is MACOM IO AT220 based. It is programmable atenuator having 2 dB steps up to 30 dB. It is placed before detector AD810. Atenuation is set to -20 dB (16 + 4). Schematics:
PCB dimensions are 30 x 45 mm. There is 7 SMD bridges and one wire bridge for -5 V (pin 7 t4HC00). Doublesided PCB is used. Grounds on both sides are connected by a piece of wire.
Components placement:
Photo:
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