Satellites information update by JE9PEL

イギリスで、近ぢか、国際科学週間が始まるそうです。そのイギリスの
アマチュア無線局から、衛星 FO-29 の CW テレメトリのデータ解析用
に私が作成したプログラム "fo29cwte.exe" について、その中のスピン
周期に関して、次のような質問メールが来ました。

Subject: FO-29 Spin Rate
From: John Heath

Hi Mineo,

In England we have National Science Week soon.
At our amateur radio station at the National Space Centre
in Leicester (GB2NSC) we will be demonstrating telemetry
from orbiting spacecraft.

To get ready for the event I have been using your excellent
decode program for FO-29 CW telemetry.

If you have time I have a question. I used sample3.txt and
the graph function. When I graph spin rate there are some
very sharp falls in spin rate.

I do not understand this, can you tell me why ?
Will I see this when I capture enough lines of data ?

73 John G7HIA

そのイギリス局への私からの返信メールです。

Hello, John G7HIA,
Thank you for using my "fo29cwte.exe".

You wrote:
> I used sample3.txt and the graph function. When I graph spin rate
> there are some very sharp falls in spin rate.
> I do not understand this, can you tell me why ?
> Will I see this when I capture enough lines of data ?

This "sample3.txt" are just 50 lines of FO-29 CW telemetry data.
I received truly about 10 lines of CW telemetry from FO-29 in 1999,
and I made "sample3.txt" from this true file to test "fo29cwte.exe"
if "fo29cwte.exe" worked correctly until 50 lines.

This some very sharp falls in spin rate appear in this true file.
I think these falls may be caused by the incorrect data from FO-29
or my incorrect decipher of these data.

I hope to succeed your National Science Week.
73