OK1KIR EME Team - 1296 MHz, Our New System

23 cm SSPA
SSPA 23cm - left side view. One pair of PA blocks mounted on the heat sink with output combiner (3dB hybrid). On the left side wall there is placed directional coupler, which is connected in series to the balancing dummy load (big heat-sinks at the frame bottom) of the combiner. It provides protection of SSPA against failure of any of four PA blocks by shutting SSPA down when rf power on the balancing output of combiner would rise over 10W level. Thin coax cables with SMA connectors bring driving power to PA blocks inputs while cables with N connectors connect outputs of PA blocks to combiner.
23 cm SSPA

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