AO-40 transponders off in preparation for orbit shift

Discussion in 'Amateur Radio News' started by Guest, May 31, 2001.

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  1. Guest

    Guest Guest

    From the ARRL...

    Ground controllers for AO-40 have shut down the satellite's
    transponders as preparations continue for a slight shift in orbital

    ''Due to changes of the spacecraft latitude for the arcjet cold
    firing, the squint pointing angle is more than 30ยบ and not currently
    useful for transponder operation,'' said AMSAT-DL President and
    AO-40 team member Peter Guelzow, DB2OS. ''Therefore we have
    suspended transponder operation for now and give the RUDAK team more

    Guelzow said the S2 transponder will remain off ''until further
    notice.'' The RUDAK beacon and the 2.4 GHz middle beacon will remain

    Plans call for raising the AO-40's perigee by approximately 200 km.
    AMSAT-NA President Robin Haighton, VE3FRH, said ground controllers
    will use magnetorquing to adjust AO-40's attitude to 270/0, then
    fire the arcjet using only ammonia fuel.

    Haighton said it's hoped that a slightly higher perigee for AO-40
    will eliminate the effects of what he described as ''a mysterious
    force'' that alters the satellite's attitude when it comes through

    Ground controllers also have suspended for now further testing on
    the X and K band transmitters and C band receiver.
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