## FO-29 サンアングル

```● (No.625) FO-29 サンアングル (2009年3月26日)
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Subject: FO-29 sun angle
From:    Mike Rupprecht
To:      Mineo Wakita
Date:    Wed, 25 Mar 2009 22:48:11 +0100

Dear Mineo,

Attached you can see a graph with the sun angle (deg) and illumination
(percent) for the next 60 days.

You can see that the sun angle is changing 2-3 deg per day. The signmeans
that the sun is shining from the left or from the right side of theaxis.

0 deg means the best angle -> the light hits with 90 deg on the solarcells.

FO-29 is always sending '72' for her sun angle. I am not sure if we can
trust this value.

If you need actually CW telemetry data ? please take a look on mySatBlog...

73, Mike

Subject: FO-29 sun angle
From:    Mike Rupprecht
To:      john heath, Mineo Wakita
Date:    Fri, 27 Mar 2009 21:59:29 +0100

Hi John, Mineo

I read a lot about the sun angle calculation and found some information on
the Japanese JAS-2 website.

@ John: here is the English translation link

FO-29 is calculating the sun angle to the Z-axis. My calculations based on
the angle between sun and the X-Axis !

BUT - Compass is sending always the channel 3B value &H24 -> that means
0100100 and correspond with 82.5 deg

You have to subtract 10 deg from the sent value because the Sun Sensor is
inclined with 10 deg

So we have an "real" sun angle of 72.5 deg. Compared with old telemetry
values this angle is constant since 2007!

Yesterday I wrote you that my calculations are showing a change of this
value of 1-2 deg /day. The actually value for today is -48 deg.

If we subtract 90 deg - 48 deg we get 42 deg. This is the angle I would
expect from FO-29.

It's all pretty strange.  I think we come to a dead end..
Have a nice weekend !
best 73,
Mike

Code   deg   :   Code   deg   :   Code   deg   :   Code   deg
0000001  27.5  : 0110001  59.5  : 1100001  91.5  : 1010001  123.5
0000011  28.5  : 0110011  60.5  : 1100011  92.5  : 1010011  124.5
0000010  29.5  : 0110010  61.5  : 1100010  93.5  : 1010010  125.5
0000110  30.5  : 0110110  62.5  : 1100110  94.5  : 1010110  126.5
0000111  31.5  : 0110111  63.5  : 1100111  95.5  : 1010111  127.5
0000101  32.5  : 0110101  64.5  : 1100101  96.5  : 1010101  128.5
0000100  33.5  : 0110100  65.5  : 1100100  97.5  : 1010100  129.5
0001100  34.5  : 0111100  66.5  : 1101100  98.5  : 1011100  130.5
0001101  35.5  : 0111101  67.5  : 1101101  99.5  : 1011101  131.5
0001111  36.5  : 0111111  68.5  : 1101111  100.5 : 1011111  132.5
0001110  37.5  : 0111110  69.5  : 1101110  101.5 : 1011110  133.5
0001010  38.5  : 0111010  70.5  : 1101010  102.5 : 1011010  134.5
0001011  39.5  : 0111011  71.5  : 1101011  103.5 : 1011011  135.5
0001001  40.5  : 0111001  72.5  : 1101001  104.5 : 1011001  136.5
0001000  41.5  : 0111000  73.5  : 1101000  105.5 : 1011000  137.5
0011000  42.5  : 0101000  74.5  : 1111000  106.5 : 1001000  138.5
0011001  43.5  : 0101001  75.5  : 1111001  107.5 : 1001001  139.5
0011011  44.5  : 0101011  76.5  : 1111011  108.5 : 1001011  140.5
0011010  45.5  : 0101010  77.5  : 1111010  109.5 : 1001010  141.5
0011110  46.5  : 0101110  78.5  : 1111110  110.5 : 1001110  142.5
0011111  47.5  : 0101111  79.5  : 1111111  111.5 : 1001111  143.5
0011101  48.5  : 0101101  80.5  : 1111101  112.5 : 1001101  144.5
0011100  49.5  : 0101100  81.5  : 1111100  113.5 : 1001100  145.5
0010100  50.5  : 0100100  82.5  : 1110100  114.5 : 1000100  146.5
0010101  51.5  : 0100101  83.5  : 1110101  115.5 : 1000101  147.5
0010111  52.5  : 0100111  84.5  : 1110111  116.5 : 1000111  148.5
0010110  53.5  : 0100110  85.5  : 1110110  117.5 : 1000110  149.5
0010010  54.5  : 0100010  86.5  : 1110010  118.5 : 1000010  150.5
0010011  55.5  : 0100011  87.5  : 1110011  119.5 : 1000011  151.5
0010001  56.5  : 0100001  88.5  : 1110001  120.5 : 1000001  152.5
0010000  57.5  : 0100000  89.5  : 1110000  121.5 : 1000000  153.5
0110000  58.5  : 1100000  90.5  : 101000   122.5 :   ---     ---

Hi Mike,

Thanks for a most interesting piece of analysis.
did you copy it to Mineo?  He may know if there is a problem with FO-29's
telemetry value for sun angle.

73
John G7HIA

Subject: Re: FO-29 sun angle
From:    Mineo Wakita
To:      Mike Rupprecht
Cc:      john heath
Date:    Sat, 28 Mar 2009 08:36:53 +0900

Hello Mike, John

Thank you.
JE9PEL, Mineo Wakita

Subject: FO-29 sun angle II
From:    Mike Rupprecht
To:      Mineo Wakita
Date:    Mon, 30 Mar 2009 09:48:44 +0200

Dear Mineo,

another strange issue:

If you read the decoding of the CW telemetry from the following Japanese
side :

http://www.jarl.or.jp/Japanese/3_Fuji/teleme/tlm.htm

You will find an value for channel 3B -> 42. This is 0100 0010 and according
the table we get an sun angle of 150.5 deg.

If you see the decoded value from this site - they get an sun angle of 40.5 deg.

Why ???
Maybe you can understand this.

Best 73 and domo arigato,
Mike

Subject: Re: FO-29 sun angle II
From:    Mineo Wakita
To:      Mike Rupprecht
Date:    Tue, 31 Mar 2009 12:48:03 +0900

The value 40.5 is wrong, the value 140.5 is right,
so the value in the web site is wrong.

Sun Angle is an angle from the X-axises of the body coordinate of
the satellites.
Because a sensor is set at the angle that inclined 10 degrees,
it is necessary to subtract 10 degrees from the value in the web site.

42 -> 0100 0010 -> 150.5 in the table -> 150.5-10=140.5 deg (is right)