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AMSAT Oscar- 13 Telemetry Logical Channels
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Posted: Mon Sep 12, 1988 8:58 PM GMT Msg: LGII-3733-1456
From: AMSATDL
To: DOCS
Subj: P3C TELEMETRY SYSPAGE
A M S A T O S C A R - 1 3 T E L E M E T R Y
logical telemetry channels
S Y S P A G E
Compiled by DB2OS
for AMSAT-DL
1st September 1988
This document describes the decoding of the 128 logical telemetry
channels of the AMSAT Phase 3C satellite, OSCAR-13.
Bytes are counted in the followings ways:
C - unsigned count (0 to +255)
Cs - signed count (-128 to +127, 2s complement)
Cx - signed count (+63 to -192, #3F=+63, #FF=-1, #80=-128,
#7F=-129, #40=-192, modified 2s complement)
All temperature channels are decoded identically using the following
decoding relationship:
Temp: T = (C-120)/1.71 Celsius
Current channels are linear, but have different calibrations for
1A, 2.5A and 5A max. current:
1A: I = (C-15)*4.854 mA
2.5A: I = (C-15)*12.135mA
5A: I = (C-15)*24.27 mA
Here the Channel identification and decoding equations:
-------------------------------------------------------
Byte Channel Calibration Remarks
--------------------------------------------------------------------
00 Uin-BCR U=(C-10)*167mV U-Panel: +0.6V @ 0.35A
+0.7V @ 1A
01 Tx-PWRout-L Average power=(261-C)^2 / 724 Watts
rectified envelope voltage.
02 T-Rx-U Temp Mode-B reveiver temperature.
03 ---
04 Uout-BCR U=(C-10)*79.5mV BCR output voltage.
05 ---
06 T-TX-U Temp Mode-B transmitter temperature.
07 I-14V-ST 5A Transponder separation bus.
08 U-10V-C U=(C-10)*53.2mV Computer supply
09 Press He-Hi off Helium tank pressure.
0A T-IHU Temp Integrated Housekeeping Unit
0B I-14V-S 1A Separation bus, 14V that supplies
torquer and LIU.
0C BCR-Oscill1 >~6=OK BCR status. No count = not
working. Typically C=80.
0D Press He-Lo off Helium regulator output.
0E T-BCR Temp Battery Charge Regulator.
0F I-10V-C 1A 10V continuous power supply.
10 BCR-Oscill2 As channel 0C
11 Press Tank off N2O4 tank pressure.
12 T-SEU Temp Sensor Electronics Unit
13 IbatCharge 2.5A Positive Current to battery.
14 L-Sensor (A) U=(C-10)*8.53mV Light-Sensor Antenna Side.
15 Motor Valve off
16 T-ABAT1 Temp Auxiliary battery 1
17 I-BCR-OUT 5A 14V line to battery and other
consumers.
18 L-Sensor (M) U=(C-10)*8.53mV Light-Sensor Motor Side.
19 ---
1A T-ABAT2 Temp Auxiliary battery 2
1B I-BCR-IN Equivalent to total current of all panels,
not available due to sensor failure.
1C Spin rate C>131, Spin rate=479/(C-109)-2 rpm
C<=131, Spin rate=(131-C)*0.85+20 rpm
Sensor angular position
oscillator. Lock indication
channel #47.
1D Rx-L-AGC Gain reduction=(C-75)^2 / 1125 dB
1E T-MBAT Temp Mean battery (normally in use)
1F I-Panel6 1A Solar panel 6
20 Tx-PWRout-U Average power=(287-C)^2 / 1796 Watts
As channel 01.
21 T-He-Tank Temp
22 T-Panel1 Temp
23 I-Panel5 1A
24 Rx-U-AGC Gain reduction=(C-71)^2 / 2465 dB
25 T-Tx-L Temp Mode-JL transmitter.
26 T-Panel3 Temp
27 I-Panel4 1A
28 ---
29 T-Rx-L Temp Mode-L receiver.
2A T-Panel5 Temp
2B I-Panel3 1A
2C U-14V-ST U=(C-10)*66.8mV Transponder separation bus.
2D T-RUDAK Temp RUDAK temperature.
2E T-top Temp Arm 1, Antenna side.
2F I-Panel2 1A
30 U-9V-U U=(C-10)*54mV Internal 9 volt bus from
Mode-B transponder.
31 T-wall-arm2 Temp
32 T-bottom Temp Arm 1, Motor side.
33 I-Panel1 1A
34 ---
35 T-wall-arm1 Temp
36 T-N2O4 Temp
37 ---
38 U-ABAT U=(C-10)*78.5mV Auxiliary battery.
39 T-S-xpnder Temp Mode-S transponder.
3A T-L-Sensor Temp Light sensor antenna side.
3B ---
3C U-9V-L U=(C-10)*45.4mV As channel 30, Mode-L
3D T-AZ50-Tank Temp
3E T-nutation damper Temp Arm 3.
3F ---
40 ES-Sensitivity 2MUX0 Earth Sensor sensitivity
threshold.
bit significance
0 LSB 20mV
1 37mV Hysteresis 200mV
2 75mV Threshold 600mV
3 150mV
4 300mV
5 600mV
6 1.2V
7 MSB 2.4V
41 Antenna/SERI 2MUX1 Antenna relays and SERI resistors.
bit significance
0 LSB Hi-gain 2m to U
1 Hi-gain 70cm to L
2 --+ SERI-1 load resistor for
3 -+! SERI-2 both Light-Sensors
!! resistance
00 7.5 Ohm
01 3.9 Ohm
10 2.3 Ohm
11 5.9 Ohm
42 RUDAK-Status 2MUX2 IN-B (ex Motor-PWR).
C=82, Standard-ROS (S)
C=78, Emergency-ROS (N, Not-ROS)
C=80, Primitive-ROS (P)
43 S&RUDAK-CNTL 2MUX3 Mode-S and RUDAK interface.
bit significance
0 LSB RUDAK OFF
1 " NMI/
2 " Byte Clock
3 " Byte count reset
4 ---
5 Mode-S Beacon ON
6 " Squelch defeated
7 MSB " Squelch Hi Sensitivity
44 BCR-Sin 2MUX4 Array voltage offset.
U=29.1+(Cs*100)mV (16.3V...41.8V)
45 BCR-Sout 2MUX5 Battery knee voltage offset.
U=14.98+(Cx*20)mV (11.14...16.2V = 192...63)
46 BCR-relays 2MUX6
bit significance
0 LSB BCR-2 ON
1 Auxiliary battery charging
2 Auxiliary battery connected,
Main battery disconnected.
47 SS-1 C=255 or C=0, PLL locked
Sun-Sensor angular position
oscillator, Slit antenna side.
48 SS-2 Time offset from SS-1
49 Flag-SS C=1, SS-1 Sun sensor data.
C=2, SS-2
4A SPIN-RAW Raw spin count (1/256).
4B Sensor-control bit significance (OUT4)
0 LSB --+ MUX-CTRL for sensor elec. module
1 -+!
!!
00 - Sun data
01 - spin ref./spin counter
10 - ES lower beam
11 - ES upper beam
2 Earth sensor positive edge select.
(Strobes value of spin count at transition.)
3 Motor Instrumentation ON.
(Pressure sensors, motore valve indicator.)
4 0.3V Sun Sensor Sensitivity
5 0.6V " " "
6 1.2V " " "
7 MSB 2.4V " " "
(Max threshold #F = 1 solar constant)
4C SS-correction
4D Last ES-A Z last ES-pulse Antenna side.
4E " O# (Orbit number and MA value)
4F Last ES-M Z last ES-pulse Motor side.
50 " O# (Orbit number and MA value)
51 Lockoutrange Within +- C counts from sun sensor pip, earth
sensor handler ignores data (Spin count 1 circle=
256 counts.)
52 ES-A Strobed spin count at edge selected,
Antenna Side beam.
53 Update Flag1 Indicates update,Antenna Side beam.
54 ES-M As channel 52 Motor Side beam.
55 Update Flag2 As channel 53 " " "
56 S/C STATUS bit significance
0 LSB LIU power ON
1 S/A plug status 0=Safe, 1=Arm
2 RUDAK-out (lock)
3 Mode-S Squelch open
4 ---
5 Memory Softerror Counter
6 " " "
7 MSB " " "
57 ---
58 ---
59 ---
5A ---
5B N no of 20ms per dot, morse speed.
5C n running count of units for morse.
5D ---
5E TRANSPONDER bit significance (OUT7)
0 LSB GB OFF
1 GB FSK (1=+170Hz)
2 DPSK OFF
3 EB ON
4 --+ PSK source
5 -+! for GB (EB: don't care)
!!
00 - no PSK
01 - ranging
10 - EB source
6 Low power transponder ON
7 MSB Passband OFF (Beacons and Mode-J +3dB)
5F ---
60 MODUS bit significance (magnet control)
0 magnet system ON
1 undespun magnet
61 M-Soll magnet vector desired angle to the despun sun
(clockwise as seen from top, 1 circle = 256)
62 M-Out bit significance (OUT3, also L,S,J control)
0 LSB polarity Arm 1
1 polarity Arm 2
2 polarity Arm 3
3 Magnet power ON
4 Mode-J ON
5 ---
6 Mode-S ON
7 MSB Mode-L ON
63 O-FRAC-lo Fractional Z increment in 20ms
64 O-FRAC-hi Counts down to 0 from preset
value. 255th Z has different
value of O-FRAC. ~7000 counts/Z.
65 O/256 Z from perigee
66 O#-lo Orbit number
67 O#-hi
68 UHR 10ms UTC
69 sec
6A min
6B hour
6C day 1st January 1978 = AMSAT day 0.
6D 256day
6E SU0 10ms IPS stopwatch 0.
6F sec
70 min
71 min*256
72 SU1 10ms IPS stopwatch 1.
73 sec
74 min
75 min*256
76 SU2 10ms IPS stopwatch 2.
77 sec
78 min
79 min*256
7A SU3 10ms IPS stopwatch 3.
7B sec
7C min
7D min*256
7E Event-Lo Used as event ID word in
7F Event-Hi intermediate buffer.
END
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