最初に私 (JE9PEL) が AMSAT-bb に投稿した文章を、イギリスの SouthGate
が推敲して載せています。 本場の英語表現が参考になるかと思いますので、
ここに二つを並べて紹介します。
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JARL report about FO-29 (Fuji-3) status and operation
Translated by Mineo Wakita, JE9PEL
7 Aug 2007
The inside impedance of battery in FO-29 (Fuji-3) are rising now
extremely by deterioration at time. According to the telemetry data
and the eclipse rate of the satellite main body, 25 minutes are
supposed with a limit as for the analog battery system use. Because
the eclipse rate of current FO-29 (Fuji-3) is about 30%, the power
supply of the relay with the battery cannot serve a period of the
eclipse.
And the malfunction occurs in the part of the electricity control
system. The malfunction to become the problem in use in particular
is UVC which is an automatic function about the electricity management.
When the satellite is in the eclipse, and the light of the sun is not
the solar battery, the transmitter becomes OFF by UVC. It is designed
afterwards so that an analog system transmitter becomes ON automatically
when the terminal voltages of the battery exceed the rated value after
the light of the sun is the solar battery. However, it is likely that
malfunction occurs for this function, and the terminal voltage cannot
turn on a transmitter even if it exceed the rated value unless we send
a command from the ground.
The eclipse rate of FO-29 (Fuji-3) will rise in future and rises to 34%
in March 2008 and comes over a peak of the eclipse rate. When it goes
over this peak, the eclipse rates decrease slowly, and it is 20% in
August 2009, and it is all sunshine in February 2010.
Because it follows for about 8 months as for all sunshine, it seems
that we can apply the analog system relay consecutively for this period.
http://www.ne.jp/asahi/hamradio/je9pel/fo29sta3.htm#3
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FO-29 Power Status
The internal impedance of the battery in FO-29 (Fuji-3) is now rising
due to the deterioration caused by almost 12 years in orbit.
According to the telemetry data a 25 minute eclipse duration is
estimated as a limit as for the analog battery system use. Because
the eclipse length of FO-29 (Fuji-3) is currently about 30% or almost
32 minutes, the power supply of the relay with the battery cannot
serve a period of the eclipse.
A malfunction also occurs in part of the electricity control system.
The malfunction is the UVC which is an automatic function for
electricity management. When the satellite is in the eclipse, and
the light of the sun is not the solar battery, the transmitter is
turned OFF by the UVC.
It is designed so that later an analog system transmitter becomes ON
automatically when the terminal voltages of the battery exceed a set
value after the power is available from the solar battery. However,
it appears likely that a malfunction occurs for this function, and
the terminal voltage cannot turn on a transmitter even if it exceeds
the set value unless commanded from the ground.
The length of eclipses for FO-29 (Fuji-3) will rise in future and
rises to 34% in March 2008 and comes over a peak of the eclipse
duration. When it goes over this peak, the eclipses will decrease
slowly, and drop to 20% in August 2009. By February 2010 it is all
sunshine with no eclipses for about 8 months. It seems that we can
apply the analog system relay consecutively for this period.
Mineo Wakita, JE9PEL
http://www.southgatearc.org/news/august2007/fo29_power_status.htm