STARSHINE telemetry
I received some telemetry frames from STARSHINE at 07-Oct, Sunday.
Ante. : ZQ-81H (LAMDA) , 144MHz Cubical Quad 8 ele.
Rig : TS-790S (KENWOOD) , 144/430MHz transceiver
TNC : TNC241, TMB965 (TASCO) , G3RUH type modem
Comp. : 486DX2/66MHz (VIP) , DOS/V computer
Soft. : Exterm.exe , Program for communication
My equipment are as stated above. TS-790S was modified for 9600.
TNC put time stamps on each packet. The property of this Quad is;
Gain F/B Weight Length
17.2dBi 25dB 3.8kg 2.61m
STARSHINE was transmitting many clear signals every 123 seconds,
or every 2 minutes and 3 seconds as follows.
[145.825MHz 9600bps FSK]
[07-Oct-01 05:36:17z] (UI C)
STRSHN>AP0332:>de N7YTK.0900
29C30000299BA453823E027BFC5B
315F85406EBA7A1C94530281FC63
66D8401928873FEE9D4D025EFC45
381A7845A56C841F8309028CFC90
D2B682F30216646962240273FC12
6E192FCBA183662A00BF0281FC88
[07-Oct-01 05:38:20z] (UI C)
STRSHN>AP03AA:>de N7YTK.0900
29C0000029D6A4388306027BFC30
3895846D5F85798B94730289FCAB
66F64ECE335649BAA14E0273FC60
27BC8893A37D7A7783C2028CFCA0
D2AE81DB022064DF6B3F0273FC43
6E174226A51C652F00C20271FC65
[07-Oct-01 05:40:24z] (UI C)
STRSHN>AP0422:>de N7YTK.0900
299E000029D3A45E82930279FC68
534D83A986EC78B39490027BFC83
65CA7343524C6F70A4C40253FC63
354D61A69BD960B885C90281FC98
D27682A30218648484BA0283FC38
6E24316CA241667300BF026BFC73
I analized here only the bottom frame in the above three frames.
STRSHN>AP0422:>de N7YTK.0900
^^^^^^
This is a ID of the sending station from "STARSHINE".
STRSHN>AP0422:>de N7YTK.0900
^^
This is required to make STARSHINE packets APRS compatible,
allowing them to be hosted by the APRS network.
STRSHN>AP0422:>de N7YTK.0900
^^^^
The timestamp in hex is 0422, i.e.
4 * 16^2 + 2 * 16^1 + 2 * 16^0 = 1058 seconds
This packet was generated 1058 seconds, or 17 minutes and 38 seconds
after STARSHINE deployment.
332(hex) = 818(dec)
3AA(hex) = 938(dec)
422(hex) = 1058(dec)
Therefore STARSHINE is transmitting exactly the beacon every
120 seconds = 2 minutes.
STRSHN>AP0422:>de N7YTK.0900
^^^^
"9" is the most significant character.
"0" are currently undefined.
299E 0000 29D3 A45E 8293 0279 FC68 : Data from A/D Converter #1
534D 83A9 86EC 78B3 9490 027B FC83 : Data from A/D Converter #2
65CA 7343 524C 6F70 A4C4 0253 FC63 : Data from A/D Converter #3
354D 61A6 9BD9 60B8 85C9 0281 FC98 : Data from A/D Converter #4
D276 82A3 0218 6484 84BA 0283 FC38 : Data from A/D Converter #5
6E24 316C A241 6673 00BF 026B FC73 : Data from A/D Converter #6
---- ---- ---- ---- ---- ---- ----
1 2 3 4 5 GAIN FULL
Channel Number
I received today, Oct 10, one frame telemetry from Starshine, and
analyzed it as follows.
Starshine 145.825MHz 9600bps FSK
[10-Oct-01 07:21:07UTC] (UI C)
STRSHN>APF302:>de N7YTK.0C00 : Header
29D3 0000 29C6 A40E 845A 0281 FC75 : Data from A/D Converter #1
1A96 84F0 58BF 7706 9402 028C FC8B : Data from A/D Converter #2
65D7 277C 3D21 298B A2FA 0271 FC45 : Data from A/D Converter #3
2802 900C A106 9395 854E 0286 FC65 : Data from A/D Converter #4
D294 829B 021E 6441 5400 0279 FC22 : Data from A/D Converter #5
6D86 4185 A549 6486 00B2 026B FC90 : Data from A/D Converter #6
---- ---- ---- ---- ---- ---- ----
1 2 3 4 5 GAIN FULL
Channel Number
F302 (hex) : time stamp = 62210 seconds = 17 h. 16 min. 50 sec.
---- ------ ------- ---- ------ ------- ---- ------ --------
Item Data Data Item Data Data Item Data Data
# Value Meaning # Value Meaning # Value Meaning
---- ------ ------- ---- ------ ------- ---- ------ --------
1 STRSHN Source Addr
2 AP04B2 Dest Addr incl.16-bit time stamp as above
3 N7YTK Gil Moore Call Sign
4 0C upper 8 bits of time stamp
5 00 Echo of uplink command
6 29D3 Ch 11 20 65D7 Ch 31 35 D294 Ch 51
7 0000 Ch 12 21 277C Ch 32 35 829B Ch 52
8 29C6 Ch 13 22 3D21 Ch 33 36 021E Ch 53
9 A40E Ch 14 23 298B Ch 34 37 6441 Ch 54
10 845A Ch 15 24 A2FA Ch 35 38 5400 Ch 55
11 0281 A/D1 Off 25 0271 A/D3 Off 39 0279 A/D5 Off
12 FC75 A/D1 FS 26 FC45 A/D3 FS 40 FC22 A/D5FS
13 1A96 Ch 21 27 2802 Ch 41 41 6D86 Ch 61
14 84F0 Ch 22 28 900C Ch 42 42 4185 Ch 62
15 58BF Ch 23 29 A106 Ch 43 43 A549 Ch 63
16 7706 Ch 24 30 9395 Ch 44 44 6486 Ch 64
17 9402 Ch 25 31 854E Ch 45 45 00B2 Ch 65
18 028C A/D2 Off 32 0286 A/D4 Off 46 026B A/D6 Off
19 FC8B A/D2 FS 33 FC65 A/D4 FS 47 FC90 A/D6 FS
---- ------ ------- ---- ------ ------- ---- ------ --------
Starshine 3 Data Channel Summary for Electronics Board
--- ---- ---- ------ -------------------- --------- ---- --------
Ch Gain DC Buffer Signal Range W6 Source
# Offset Measurement (mV) Pin# (Con-Rin)
--- ---- ---- ------ -------------------- --------- ---- --------
11 16 +16.7 - IPS Current #2 -2.5/40 5 W10-5
12 64 none - Temperature #5 7.8/28 22 W18-6
13 16 +16.7 - IPS Current #5 -2.5/40 21 W18-5
14 32 +66.7 - String Current #6 -41/0 20 W16-8
15 1 none yes IPS Battery V(3.0)#6 1000/1500 19 W16-7
21 32 none - Si Test Cell cntl #7 ~50 25 W20-5
22 1 none yes IPS Battery V(3.0)#2 1000/1500 7 W10-7
23 32 +66.7 - String Current #5 -41/0 24 W18-8
24 64 none - Temperature #2 7.8/28 6 W10-6
25 1 none yes IPS Battery V(3.0)#5 1000/1500 23 W18-7
31 64 none - Temperature #4 7.8/28 10 W12-6
32 32 none - Si Test Cell Nusil#7 ~50 27 W20-7
33 16 +16.7 - IPS Current #4 -2.5/40 9 W12-5
34 32 none - Si Test Cell DC935 #7 ~50 26 W20-6
35 32 +66.7 - String Current #2 -41/0 8 W10-8
41 16 +16.7 - IPS Current #3 -2.5/40 13 W14-5
42 32 +66.7 - String Current #8 -41/0 29 W22-8
43 32 +66.7 - String Current #4 -41/0 12 W12-8
44 32 +66.7 - String Current #7 -41/0 28 W20-8
45 1 none yes IPS Battery V(3.0)#4 1200/2100 11 W12-7
51 1 none - PMAD Battery V 1800/2070 32 W8-13
52 1 none yes IPS Battery V(3.0)#3 1200/2100 15 W14-7
53 Not Used 31
54 64 none - Temperature #3 7.8/28 14 W14-6
55 32 +66.7 - String Current #1 -41/0 30 W24-8
61 1 none - PMAD Battery I 500/1600 33 W8-14
62 16 +16.7 - IPS Current #6 -2.5/40 17 W16-5
63 32 +66.7 - String Current #3 -41/0 16 W14-8
64 64 none - Temperature #6 7.8/28 18 W16-6
65 8 none - Electronics I 14/200
--- ---- ---- ------ -------------------- --------- ---- --------
Temperature Sensor powered from IMPS in String 5 is on cell 66
Temperature Sensor powered from IMPS in String 2 is on the main battery
Temperature Sensor powered from IMPS in String 4 is on the string board
Temperature Sensor powered from IMPS in String 3 is on cell 47
Temperature Sensor powered from IMPS in String 6 is on cell 4
Data is 16 bit resolution (65536 counts) on a 2.5 V full scale, each
set of 5 channels has a separate reference voltage and zero offset
reading. Each received data point is a 4 byte hex code value
(FFFF = 65535). The DC offset is a percentage of full scale and is
subtracted from the channel data and then divided by the gain to get
the signal level counts as a fraction of the full scale counts.
Refer to the next web site for more informations,
http://epulation.com/starshine/starshine3/ss3parse.htm
-Advance Technology Experiment for the Starshine 3 Satellite (.pdf)
-Starshine 3 Computer/Data Acquisition Summary
-Starshine 3 Computer/Data Acquisition Block Diagram
I calculated the telemetry data from Starshine, how to convert from
raw data to engineering units.
[145.825MHz, 9600bps FSK]
[10-Oct-01 07:21:07z] (UI C)
STRSHN>APF302:>de N7YTK.0C00
29D3 0000 29C6 A40E 845A 0281 FC75
1A96 84F0 58BF 7706 9402 028C FC8B
65D7 277C 3D21 298B A2FA 0271 FC45
2802 900C A106 9395 854E 0286 FC65
D294 829B 021E 6441 5400 0279 FC22
6D86 4185 A549 6486 00B2 026B FC90
Phillip Jenkins [Phil.Jenkins@grc.nasa.gov] wrote
at 14:08:51 -0400, 12 Oct 2001,
> It looks like we need to add a few more instructions to the web page
> on how to convert raw data to engineering units. Here is the formula
> for converting the raw signal to volts:
>
> Volts = (CH11 - ValOff)/(CalVal - ValOff)) * Vref/GAIN
> - ((Vref/GAIN ) * Offset/100)
>
> Ch11 CH12 CH13 CH14 CH15 ValOff CalVal
> 29D3 0000 29C6 A40E 845A 0281 FC75
Using my telemetry packet, first I convert all HEX to DEC.
Then,
CH 11 = 29D3(hex) = 10707(dec)
ValOff = 0281(hex) = 641(dec)
CalVal = FC75(hex) = 64629(dec)
GAIN for CH11 = 16
Offset = 16.6666
Vref = 2.493
Therefore, Volts = (10707-641)/(64629-641)*2.493/16
- ((2.493/16)*16.666/100)
= 0.001457 [Volts]
= 1.457 [mV]
which is in the "Range(mV) -2.5/40" = -0.0625.
He says also,
> Channels 11,12 and 13 malfunctioned before launch and are not valid.
Refer to the URL for more information,
http://epulation.com/starshine/starshine3/ss3parse.htm
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