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AO-51 Software Crash

Discussion in 'Satellite and Space Communications' started by K6LCS, Sep 26, 2010.

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  1. K6LCS

    K6LCS Premium Subscriber QRZ Page

    It looks like AO-51's computer crashed somewhere between 0700 and 0800 UTC last night. I managed to start the reload process on a 7 degree pass here this morning, and the 435.150 transmitter should be on at close to 1 watt with 9k6 telemetry. I'd appreciate any telemetry reports between now and this afternoon's passes, especially battery voltage and temperature. This reload may take a little longer than the last few due to command station availability.

    73, Drew KO4MA
    AMSAT-NA VP operations
  2. KD8KSN

    KD8KSN Ham Member QRZ Page

    AO51 reports are always appreciated at Here is the latest from Mark, N8MH:

    Hi All,

    If you're tuning around, you'll probably hear AO-51 on 435.150 @ 9600 baud.
    Reloading continues; give us another day or two to get it loaded and configured.


    Mark L. Hammond [N8MH]
  3. KD8KSN

    KD8KSN Ham Member QRZ Page

  4. KD8KSN

    KD8KSN Ham Member QRZ Page

    AO51 is back in mode V/U. Here is the latest from Mark, N8MH:

    Hello All,

    For now AO-51 is open for normal V/U mode voice operations on 145.920 MHz up,
    435.300 MHz down. The 435.150 transmitter is for telemetry only (no uplink).

    There is still some more reloading to do, but the bird is operational and ready
    for use.

    Hopefully we can soon get things to the point where we can run some V/S
    mode--give us another day or two. We'll announce any mode changes on here.

    (Thanks to the other command stations (Kevin WA6FWF and Drew KO4MA) for a great
    team effort.)


    Mark L. Hammond [N8MH]

    AO51 reports are still appreciated at
  5. AA0CW

    AA0CW Ham Member QRZ Page

    Wow very very weak signal. I barely copied one station AJ5C.
  6. KD8KSN

    KD8KSN Ham Member QRZ Page

    Here is the latest......

    Hello All,

    The reloading of AO-51 is essentially complete; the bird is in good order. A
    side effect of the crash/reload is that the mode change to S-band has been
    delayed--until now.

    We are going to resume the scheduling of AO-51 with the following changes: the
    power budget should allow the simultaneous operation of both the S-band and
    U-band transmitters. The tradeoff is that the U-band will be low in
    power-around 250 mW or so.

    Also, please notice the use of the 145.880 MHz uplink!

    This is a great time to work on improving the sensitivity of your receiver
    setups! The 250 mW will challenge some of you for sure. PLEASE be sure to
    follow the "if you can't hear it, don't try to uplink" basic rule of satellite

    If the satellite supports the dual downlink mode OK, we may extend the V/S-U
    mode a few days past the original mode schedule in order to give mode S
    operators a fair shake at some operations and testing--while at the same time
    allowing some low power mode V/U operations!

    September 29 (around 2120 utc)

    FM Repeater, V/S-U
    Uplink: 145.880 MHz FM (no PL tone)
    Downlinks: 2401.200 MHz FM *and* 435.300 MHz FM (at low power!)

    Mark L. Hammond [N8MH]
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