SO-50 is a widely used amateur radio satellite that has FM transponders that use a 67 Hz PL tone for access. It operates as a repeater and was designed and built as part of a Saudi Arabian amateur radio program.

Uplink FM (67 Hz CTCSS) 145.850 MHz

Downlink FM 436.765 MHz

Below is my first recording of SO-50, it is a very short recording. I was able to make contact with Juan Gil Aguilar from Mexico – XE1YDK.