In this video Assistant Professor for Space Science at Morehead State University and chief engineer for the Cosmic X-ray Background Nanosatellite, Kevin Z. Brown describes the subsystems for CXBN which has an amateur radio downlink on 437.525 MHz, GFSK, AX.25.

The diminutive satellite will characterize remnant X-ray radiation from the Big Bang.

Watch Subsystems of CXBN, explained

Amateur Radio CubeSats Launched from Vandenberg http://www.uk.amsat.org/?p=9277