Logging AO-27 Telemetry

We need your help in logging TLM from AO27. While we condition the batteries we can use your help in receiving TLM from the satellite. If you have a 1200 AFSK TNC that you can connect to your satelite receiver, you have all the hardware you need.

To receive that data in a format we can use, follow these steps:

  • Download AO27TLM Version 1.1 (This is a newer version than on AMSAT.ORG)
  • Connect your TNC and verify that you can receive normal packet
  • Put your TNC into kiss mode (This is done with a terminal program. AO27TLM will not put the tnc into kiss mode. Many TNCs will use the commands kiss on, restart)
  • Make sure your clock on the computer is set correctly
  • Run AO27TLM with the /OT command line option (this is the only type of data we can use. If you log to raw kiss, please send it as well.
  • When the pass is over, exit AO27TLM
  • E-mail the resulting file (xxxxxxxx.LOG) to n3uc@arrl.net (if you send it to any other address, our processing software will not receive it and it will be lost>

    • The Whole Orbit Data channel definitions are contained in a file called EYEWOD. This file is updated anytime the channels that are saved as wod on AO-27 are changed. Below is a link to the current channels so AO27TLM will extract the correct channels. This file is not needed to log data. It is only used if you would like to post process the data and look at the WOD your self.

    Be sure you rename the file to EYEWOD
    The Current, Version 18 (0x12) EYEWOD file for AO27TLM.
    Version 17 (0x11) EYEWOD_17


    Example WOD output:
    File Sat_Feb_28_14_02_59_2009.txt

    Convert from Byte offset in TLM data into Channel number: 
    
...
[SWS] <WODVER=18><WOD1=47><WOD2=7B><WOD3=51><WOD4=53><WOD5=55><WOD6=57><WOD7=59><WOD8=5B><WOD9=41><WOD10=49>
...

Take the byte value from the WOD [SWS] line, example <WOD1=47>

Convert 0x47 to decimal, = 71
Byte offset into TLM frame of 71 - Channel 0x21 (10 Bus Voltage)
so WOD1 is channel 0x21.

Current Mappings:
WOD version 18 (0x12)
47 == 71      10v Bus Voltage
7B == 123     Tepr State (TOPR does not use this right now)
51 == 81      -X Current   
53 == 83      +X Current
55 == 85      -Y Current
57 == 87      +Y Current
59 == 89      -Z Current
5B == 91      +Z Current
41 == 65      Solar Array Voltage
49 == 73      Battery #5 Temp

Byte Offset, Channel, Name, C2, C1, C0, Unit
--------------------------------------------
49 16    Bat 0 V:        +1.900       -0.0041666   0.000       Volts
51 17    Bat 4 V:        +1.900       -0.0041666   0.000       Volts
53 18    Bat 2 V:        +1.900       -0.0041666   0.000       Volts
55 19    Bat 6 V:        +1.900       -0.0041666   0.000       Volts
57 1A    Bat 1 V:        +1.900       -0.0041666   0.000       Volts
59 1B    Bat 5 V:        +1.900       -0.0041666   0.000       Volts
61 1C    Bat 3 V:        +1.900       -0.0041666   0.000       Volts
63 1D    Bat 7 V:        +1.900       -0.0041666   0.000       Volts
65 1E    Solar Array V:  +7.9650682   +0.0686763   0.000       Volts
67 1F    8 Bus Voltage:  +7.0473333   +0.0113333   0.000       Volts
69 20    5 Bus Voltage:  +3.7500000   +0.0125000   0.000       Volts
71 21    10 Bus Voltage: +8.1699655   +0.0204189   0.000       Volts
73 22    Battery #5:     +145.08000   -0.9200000   0.000       Deg C.
75 23    10 Bus Current: -8.5766634   +4.6595804  +0.0090934   mAmps
77 24    8 BUS Current:  -0.2637419   +1.9861031  -0.0002043   mAmps
79 25    5 BUS Current:  -1.6011952   +5.3687733  -0.0001976   mAmps
81 26    -X Array Cur:   +2.5393978   +1.2945522   0.0029869   mAmps
83 27    +X Array Cur:   +3.8778891   +1.2337216   0.0034585   mAmps
85 28    -Y Array Cur:   +1.9453662   +1.2869215   0.0036150   mAmps
87 29    +Y Array Cur:   +0.8377529   +1.3201728   0.0030064   mAmps
89 2A    -Z Array Cur:   -5.1705101   +1.3962301   0.0002714   mAmps
91 2B    +Z Array Cur:   +3.7194087   +1.1232609   0.0041865   mAmps
93 2C    External Cur:   -1.3147137   +1.5779074   0.0013702   mAmps
95 2D    BCR Input Cur:  +9.8611991   +1.0931975   0.0099122   mAmps
97 2E    BCR Output Cur: +0.000       +1.000       0.000       Count
99 2F    BCR Plate Temp: +145.08000   -0.9200000   0.000       Deg C.
101 30    BCR PC-Board:   +145.08000   -0.9200000   0.000       Deg C.
103 31    Battery #0:     +145.08000   -0.9200000   0.000       Deg C.
105 32    TX-A RF OUT:    -21.995773   -8.1787836  +0.2143451   mWatts
107 33    TX-B RF OUT:    -111.61003   -5.2876206  +0.2271923   mWatts
109 34    TX THER A:      +140.69230   -0.8846154   0.000       Deg. C
111 35    TX THER B:      +140.69230   -0.8846154   0.000       Deg. C
113 36    TX THER C:      +140.69230   -0.8846154   0.000       Deg. C
115 37    TX THER D:      +140.69230   -0.8846154   0.000       Deg. C
117 50    EDAC Counter:   +0.0000000   +1.0000000   0.000       Count
119 51    Eclipse:        +0.0000000   +1.0000000   0.000       Count
121 52    Set Point:      +0.0000000   +1.0000000   0.000       Count
123 53    Tepr State:     +0.0000000   +1.0000000   0.000       Count
125 FF    VERSION:        +4.0          0.0000      0.000       Version