FUNcube-1 satellite: Why does spin direction flip?

Discussion in 'Amateur Radio News' started by G4TUT, Nov 2, 2019.

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  1. G4TUT

    G4TUT Ham Member QRZ Page

    FUNcube-1 satellite: Why does spin direction flip?
    Since launch of the amateur radio FUNcube-1 (AO-73) CubeSat in 2013 the team have observed the spin of the satellite based on the panel temperatures

    The FUNcube team have speculated why the satellite spins up and down and occasionally flips the direction of spin.

    Recently Jason Flynn G7OCD found a YouTube video that might explain the flip:

    Watch The Bizarre Behavior of Rotating Bodies, Explained

    The spin rate change is still a mystery but the FUNcube team have proposed:
    • The YORP effect:
    • Electromagnetic torquing due to changes in current levels on the bus conductors during changes in illumination
    Read more here

    There is a FUNcube open group and you can join at


    AD8BU, NU4R, KK7AMB and 1 other person like this.
  2. KA2IRQ

    KA2IRQ Ham Member QRZ Page

    That was awesome.
    NU4R likes this.
  3. VE4MM

    VE4MM Ham Member QRZ Page

    That may explain when I work the sats sometimes the signals fade in a Milli-second and then come back in a short time.

    I assume the antennas polarization changes very rapidly.

    Interesting video.

    Mike, ve4mm
  4. KI6PMD

    KI6PMD Ham Member QRZ Page

    Left hand circular polarization & Right hand circular polarization ! on your antenna array help on up link & down link but sometimes nothing helps ! Hi Hi 73' Phil KI6PMD see you on the next pass..
  5. W5TTW

    W5TTW XML Subscriber QRZ Page

    OK, but why is the twist-tie on a new loaf of bread always in reverse?
    N5BKG, K0PV, KF5FEI and 1 other person like this.
  6. K6CLS

    K6CLS Ham Member QRZ Page

    It's in the metro system.
    W5TTW likes this.
  7. KK6YAE

    KK6YAE Ham Member QRZ Page

    They only allow people who are left handed put them on. So if you take them off with your left hand, everything works out nicely.
    W5TTW likes this.
  8. K6CLS

    K6CLS Ham Member QRZ Page

    (oh darn, METRIC system not metro system. autocorrect fail)
  9. W7UUU

    W7UUU Super Moderator Lifetime Member 133 Administrator Volunteer Moderator Platinum Subscriber Life Member QRZ Page

    Yes but in Europe and Japan, the Metro System is in fact Metric... so it's all good :)

    K6CLS likes this.
  10. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    You had me scratching my trying to figure out this out. Darn satellite systems keep changing so fast! ;)

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