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[jamsat-bb:17566] Re: EVE 成功!


みなさま

先ほどのメール、ユニコードが混じったようで、文字化けされた方も多かったと思いま
すので再度お送りします。

amsat-bbに下記のメールが流れました。機械翻訳ベースで申し訳ありませんが、前
文だけ簡単に載せますと

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2009年3月25日に、ドイツのAMSAT-DLのチームは、火星に向かう惑星探査機(P5-A)実
現へのマイルストーンに到達しました。 ボーフム天文台の地上局は無線信号を金星に
送りました。 およそ1億キロメートルの周遊旅行を旅行した後、約5分の遅れで、金星
の表面からのエコーを明確に受け取りました。 惑星のエコーを受けるのは、ドイツと
ヨーロッパで初めてのことです。 さらに、これはアマチュア無線家によって行われる
月面反射通信(EME)からの反射よりも100倍以上の遠い距離からの反射信号です。
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周波数は2.4GHz、送信機はルビジウム発振器で制御されたマグネトロン送信機で出力
6KW、モードはCWだったそうです。

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On March 25th, 2009 a team from the German space organisation AMSAT-DL reached
  another milestone on its way to an own interplanetary probe towards
planet Mars.
The ground station at the Bochum observatory transmitted radio signals
to Venus.
After traveling almost 100 million kilometers and a round trip delay of about
5 minutes, they were clearly received as echoes from the surface of Venus.
Receiving planetary echoes is a premiere in Germany and Europe. In addition,
this is the farthest distance crossed by radio amateurs,
 over 100 times further than echoes from the moon (EME reflexions).

For receiving the EVE (Earth-Venus-Earth) reflections, an FFT analysis
with an integration time of 5 minutes was used.
After integrating for 2 minutes only,
the reflected signals were clearly visible in the display.
Despite the bad weather,
signals from Venus could be detected from 1038UT on until the planet
reached the local horizon.

The high power amplifier which is described in the current AMSAT-DL journal
 has therefore passed this crucial test as a final key component for
the planned P5-A Mars mission.
By receiving generated echoes from Venus,
the ground and command station for the Mars probe has been cleared for
operational
use and the AMSAT-Team is now gearing up for building the P5-A space probe.
For financing the actual construction and launch, AMSAT-DL is
currently in negotiation
with the DLR (Deutsches Zentrum fur Luft- und Raumfahrt) among others,
 to obtain financial support for the remaining budget of 20 Mill EUR.

AMSAT-DL wants to show that low-budget interplanetary exploration is
possible with its approach.

More information and the link to the official press release:

http://www.amsat-dl.org//index.php?option=com_content&task=view&id=166&Itemid=97


The EVE experiment was repeated on Thursday, March 26th for several
hours with good echoes
 from Venus. Morse code was used to transmit the well known ?HI“
signature known
from the AMSAT OSCAR satellites.


73s de DB2OS

Peter Guelzow
President AMSAT-DL


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JG1KOE 小黒 常隆
Oguro Tunetaka
oguro-t@asahi.com
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