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Re: AO-40 E block question



Jim,

Would you not suspect that the clock is malfunctioning? Could that
possibly cause the retransmittal of data that is actually current?

Any other ideas?  Stacey?

73...Jim...W5VZF.

Dr. Jim Akers
Dept. of Electrical
and Computer Engineering
Miss. State Univ.


On Fri, 9 Aug 2002, Jim Walls wrote:

> Hi all,
>     I was watching the AO-40 telemetry for a while this morning, and
> noticed something that made me ask why?  I know that E blocks are events
> that have happened at some point in the past. What I was noticing was
> that the same block was being sent over and over and over.  Looking at
> the raw data (quick look) and the decoded E block telemetry it looked
> like exactly the same block was being transmitted as many as 5 times in
> a row (with no othere blocks being sent), and it was data that was over
> a year old.
>     First of all, I have to wonder why the same block was being
> transmitted over and over, and secondly why are we having the satellite
> transmit E blocks from over a year ago?  I have to think that the
> command team has been able to get a clean decode of these blocks and
> does not need to spend beacon time transmitting this ancient history
> again and again.  Since the beacon has a rather fixed (and low speed)
> capability, I would think it does not make sense to keep transmitting E
> blocks that have been successfully decoded here on earth and archived.
> Or is there no way to flush old events from the satellite's memory so it
> stops sending them?
> Here are a couple of the E blocks that I decoded this morning...
>
>
> +=+=+=+=+=+=+=+=+=+  E V E N T    S T A T U S  +=+=+=+=+=+=+=+=+
> E  HI, THIS IS AMSAT OSCAR-40       2001-05-13  04:12:10  #015D
>
> EVENT #0008
>
>
> AMSAT Day = 8533    Orbit# = 245    MA = 149
> Current AMSAT Day = 8986
> --------------------  R E C E I V E R S -------------------------
> 21MHz: OFF       24MHz: OFF       V: Off          U: On HiGain
> L1:  HiGain      L2: ON           S1: OFF
> S2: OFF          C: OFF           Leila: #D9D9
> ------------------  T R A N S M I T E R S -----------------------
> U: Off       V: Off       S1: OFF       S2: ON
> X: Off       K: Off
> ----------------------  A G C / A L C --------------------------
> V-Rx: -12.77dB       U-Rx: 11.97dB      L1-Rx: 0.74 dB
> L2-Rx: -0.28dB       S1-Rx: -62.14dB    S2/C-Rx: -253.70dB
> HF-Rx: 008      V-Tx: 175     U-Tx: 008     S2-Tx: 077
> ----------------------  B E A C O N S ---------------------------
> GB: ON       GB FSK: OFF      DPSK: ON       EB: OFF
> GB PSK Source: EB Source
> -----------------------  S A F E T Y ---------------------------
> Magnet System: Off       Emerg. Flags:#08
> Soft Errors:3            Solar Array Plug: Armed
> ------------------  E X P E R I M E N T S -----------------------
>
>
> +=+=+=+=+=+=+=+=+=+  E V E N T    S T A T U S  +=+=+=+=+=+=+=+=+
> E  HI, THIS IS AMSAT OSCAR-40       2001-09-15  17:51:08  #02FD
>
> EVENT #000C
>
>
> AMSAT Day = 8658    Orbit# = 403    MA = 237
> Current AMSAT Day = 8986
> --------------------  R E C E I V E R S -------------------------
> 21MHz: OFF       24MHz: OFF       V: Off          U: On HiGain
> L1:  HiGain      L2: ON           S1: OFF
> S2: OFF          C: OFF           Leila: #D8D9
> ------------------  T R A N S M I T E R S -----------------------
> U: Off       V:  HiGain   S1: OFF       S2: OFF
> X: Off       K: Off
> ----------------------  A G C / A L C --------------------------
> V-Rx: -12.77dB       U-Rx: -1.28dB      L1-Rx: 0.74 dB
> L2-Rx: -0.28dB       S1-Rx: -62.14dB    S2/C-Rx: -253.70dB
> HF-Rx: 008      V-Tx: 048     U-Tx: 008     S2-Tx: 077
> ----------------------  B E A C O N S ---------------------------
> GB: ON       GB FSK: OFF      DPSK: ON       EB: OFF
> GB PSK Source: EB Source
> -----------------------  S A F E T Y ---------------------------
> Magnet System: On        Emerg. Flags:#00
> Soft Errors:4            Solar Array Plug: Armed
> ------------------  E X P E R I M E N T S -----------------------
> Rudak: ON          GPS: ON         RFexp: OFF      Camera A: OFF
>
>
> 73
> -----------------------
> Jim Walls - K6CCC
> k6ccc@amsat.org
> http://home.earthlink.net/~k6ccc/
> 626-302-8515    FAX  626-302-7501
> AMSAT member 32537 / WSWSS member 395
>
>
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