業餘衛星 FO-29

VR2GY

Detailed Description

FO-29 carries a 100KHz wide SSB/CW linear transponder that operates in mode V/U. It additionally carries a 1k2/9k6 digital BBS that is no longer operational and a Digitalker beacon that transmits a digital voice on FM.

FO-29 includes an attitude control system that consists consists of a sun-sensor, geomagnetism sensor, magnetorquer and data processor. It also features an advanced solar cell experiment consisting of gallium-arsenide solar cells 2cm x 2cm and 2cm x 1cm cells.
Orbit

    Polar orbit, details have not been fixed yet.
    Perigee between 800 and 900 km above the ground and we are asking NASDA to take apogee as high as possible.

Launch

    Launched by H-II rocket No.4, from Tanegashima Space Center of NASDA.

Mission subsystem (communication subsystem)
JAS-2 operates in mode J, that is, 145MHz band for uplink and 435MHz band for downlink.

    Analog transponder (linear transponder) for phone and CW. Total transmitting power is 1W, of which beacon is 100 mW.
    Digital transponder (store-and-forward packet processor) bit rate 1200 or 9600 bps, alternative operation for 1200 bps, uplink in Manchester coded FM / downlink in bi-phase PSK for 9600 bps, FSK after G3RUH, both uplink and downlink. Total transmitting power is 1 W.
    Digi-talker transmits information by voice, audible with a hand-held transceiver. Source information data in PCM is sent to JAS-2 from the control station.
    Data processor, consisting of the CPU V50, static RAMs of 2MB, deals with BBS, digi-talker, telemetry and command data processing and self-operating jobs.

Bus subsystem

    Size and structure
    44 cm wide and 47cm high, sphere-like polyhedron consisting of 26 panels,weighs 50 kg.
    Power supply
    Gallium-Arsenide solar cells of 2cm x 2cm and 2cm x 1cm pieces, and 11 cells of Nickel-Cadmium storage battery of 6 AH.
    Attitude control
    This consists of sun-sensor, geomagnetism sensor, electric magnet or magnetorquer and data processor.
    The axis of symmetry of JAS-2 becomes the spin axis, and operating attitude will be in so-called "wheel mode", that is the spin axis being perpendicular to the orbit plane.