● (No.269) AO-40 姿勢変更 (2001年 5月25日)
　------------------------------------------

本日(5/25)、衛星AO-40 の LOS間際の 5/24 23:22:25UTC (衛星内部時刻) に
(5/25 08:22:25JST) 受信した、S2ビーコン「CRC VALID OK」の 1ブロックを
次に示します。観測地点から最も遠い、6万4千km の彼方の宇宙から飛んでき
たデジタル信号のデータです。

昨日(5/24)、AO-40 コマンドチームの DB2OS/Peter Guelzow 氏が、amsat-bb
で 姿勢変更と運用スケジュール変更について広報していたとおり、AO-40 の
受信データでも、ALON/ALAT は「0/-10」に、 U/L1->S2 は「MA 100-180」と
なっていました。

AO-40 S2-beacon
29ele.Loop(Maki) + PreAmp.(Maki) + Converter(Drake)

  JST       MHz(USB)  MA   RS  km   
  08:22:25  2401.322  145  45  64070


WPSKDEC 1.2b - AMSAT-FRANCE Registred to JE9PEL
## AO-40 IHU-1 Telemetry Display - OE1KIB, OE1VKW, F1HDD, XTOPHE ##
A  HI, THIS IS AMSAT OSCAR-40       2001-05-24  23:22:25  #01A4 
+--------------------------------------------------------------+
| ALON/ALAT=0/-10; EXPERIMENTAL U/L1->S2, MA 100-180, AVOID MB!|
+--------------------------------------------------------------+
________________________ Orbit data ____________________________
AMSAT day 08544  Time 23:22:25.02 UTC  Orbit No 00260  Phase 145
________________________ Status ________________________________
RX: U(-1.3dB Leila1) L1(0.7dB S2/Ku) L2(-0.3dB) 
TX: S2(0x62W L1 Leila1 MB) 
Beacons: GB(PSK;) MB(EB source; S2/Ku)
Ant/Pre-amps: V-Rx=hi V-Tx=om U-Rx=hi U-Tx=om L-hi+preamp
Experiments: RUDAK GPS B-Cam Cedex-ctrl Cedex-pwr
Main battery on; Memory soft error count: 3
________________________ Temperatures [.C] _____________________
 SolPan1   -5.8  SolPan2    9.4  SolPan3    8.7  SolPan4    7.4
 SolPan5    7.4  SolPan6   -3.8
 BCR1       8.1  BCR2      14.7  BCR3      11.4
 MainBatB2  8.7  MainBatB4 97.7  MainBatB6 -5.8
 AuxBatB1  12.7  AuxBatB5  16.6
 V-TX      13.3  U-Excit   11.4  U-Amp     11.4  S1-TX     19.3
 S2-TX     21.2  X-TX      85.6  X-TX TWT  87.3
 U&V-RX    19.3  L1-RX     19.3  L2-RX     19.3  S1-HF RX  10.7
 S2-C RX   11.4  IHU        4.1  SEU        1.5  EPU       12.7
 HP1+X-Y   11.4  HP2+X+Y   12.7  HP2+X-Y   14.0  HP2-X     97.7
 HP3+X     17.3  HP3-X     17.9  HP4+X+Y   19.9
 NH3 B2    10.7  MMH B3    12.7  N2O4-X-Y  97.7  N2O4+X+Y  19.9
 He Tank   97.7
 Top       97.7  Bottom    97.7  Back      97.7  Side2Pan  12.0
 Side4Pan  10.0  S ant     18.6
________________________ Voltages [V] __________________________
 Main-Bat  28.9  Aux-Bat   19.7
 BCR1-In   25.6  BCR2-In   21.2    BCR3-In   10.5
 28V Bus   28.7  10V-C1BCR2  10.5  10V-C2BCR3  10.6
________________________ Currents [mA] _________________________
 SP1-BCR1 16224  SP4-BCR2 16224  SP2-BCR3 16224
 SP6-BCR1 16123  SP5-BCR2 16224  SP3-BCR3 16224
 10V-C1BCR2  2013  10V-C2BCR3  2013  28V-SSEU 0xa9
 28V-Bat     50  28VU1EPU    -1  28VU2Bus  2807
 28VU3-S    517  28V-BCR   2624
 28VS-PA/M 5845  10VS-PA/M 0xa4  X-Helix      3 K-Tx      0x9a
________________________ Sun/Earth Sensors _____________________
Sensor mode: spin
 SS1 PLL: locked  SS2 count: 30  SpinRate[rpm]   5.2
 SS Z-25   -25.  SS Y-25   -25.  SS Up-X     4.  SS Up-Y     4.
 SS Z-45   -44.  SS Y-45   -44.  SS Dwn-X    4.  SS Dwn-Y    4.
###### AO-40 IHU-1 Telemetry Display --- End of A/E Block ######
  
 CRC VALID : 4b5  


> Date: Thu, 24 May 2001 09:40:50 +0000
> From: Peter Guelzow [peter.guelzow@arcormail.de]
> To: amsat-bb@amsat.org, info@amsat-dl.org, P3-D Mailing Liste
>     [p3d-dev@amsat.org]
> Subject: [amsat-bb:47235] AO-40: Schedule change
> 
> Dear All, 
> 
> In order to escape the rapidly approaching sun and get ready for our
> move to 270/0, we have lowered ALAT to approximately -11 degs. 
> 
> ALON is currently estimated at 3 degs. 
> 
> These values will be tweaked with YACE images shortly (Orbit 259,
> download starting at about 0600 UTC on 5/24). 
> 
> We will continue to lower ALAT to about -25 degs, before beginning
> to move ALON past the sun. 
> 
> The result of all this is that there is no reason to continue the 
> X-Tx, K-Tx, or C-Rx testing at the moment as >11 deg. minimum squint
> is not enough for useful signals. In addition, the RUDAK team has 
> asked for more time for RUDAK. 
> 
> Accordingly, the schedule will be modified to stop the K-Tx, X-Tx, 
> C-Rx testing and give RUDAK more uninterrupted time with a relatively
> good squint angle. 
> 
> The schedule for S2 downlink will be as follows:
> 
>    MA        Mode
>  ------------------------------
>  240-039     beacon only      
>  040-099     RUDAK      
>  100-179     L1/U passband On      
>  180-239     RUDAK       
> 
> The S2 MiddleBeacon (MB) is continuously On.
> 
> Message blocks will be updated to reflect these new and slightly 
> reduced transponder times. 
> 
> 73s Peter DB2OS for the P3-D team

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