CubeSat Transponders Active
PSK31 transponders on two US Naval Academy CubeSats are operational, according to Bob Bruninga, WB4APR. The CubeSats launched on May 20 from Cape Canaveral on an Atlas 5 launcher. The launch included a pair of 1.5U CubeSats — the PSAT APRS/PSK31 satellite and BRICsat, a propulsion/PSK31 satellite — as well as a 3U CubeSat, USS Langley (Unix Space Server Langley). The launch also included The Planetary Society’s LightSail-1.
Bruninga said PSAT is a student satellite project named in honor of USNA alum Bradford Parkinson, of GPS fame. It contains an APRS transponder for relaying remote telemetry, sensor, and user data from remote users and Amateur Radio environmental experiments or other data sources back to Amateur Radio experimenters via a global network of Internet-linked ground stations. A Brno University transponder on PSAT supports multi-user PSK31 text messaging (28.120 MHz uplink/435.350 MHz FM downlink). Bruninga said the PSAT telemetry on 145.825 MHz (1200 baud AX.25) is working okay, but the digipeater is off at present, since the PSK31 transponder is the primary mission. The APRS downlink page is now capturing PSAT telemetry.
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