無線電天文發燒友, 係時候開工喇

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Wah!!
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無線電天文發燒友, 係時候開工喇

文章 Wah!! » 週六 28 1月, 2006 14:40

http://science.nasa.gov/headlines/y2006 ... uitsat.htm

January 26, 2006: One of the strangest satellites in the history of the space age is about to go into orbit. Launch date: Feb. 3rd. That's when astronauts onboard the International Space Station (ISS) will hurl an empty spacesuit overboard.

The spacesuit is the satellite -- "SuitSat" for short.
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"SuitSat is a Russian brainstorm," explains Frank Bauer of NASA's Goddard Space Flight Center. "Some of our Russian partners in the ISS program, mainly a group led by Sergey Samburov, had an idea: Maybe we can turn old spacesuits into useful satellites." SuitSat is a first test of that idea.


SuitSat can be heard by anyone on the ground. "All you need is an antenna (the bigger the better) and a radio receiver that you can tune to 145.990 MHz FM," says Bauer. "A police band scanner or a hand-talkie ham radio would work just fine." He encourages students, scouts, teachers and ham radio operators to tune in.
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For years, Bauer and colleagues at Goddard have been connecting kids on Earth with astronauts on the ISS through the ARISS program (Amateur Radio on International Space Station). "There's a ham rig on the ISS, and the astronauts love talking to students when they pass over schools," Bauer explains. ARISS is co-sponsoring SuitSat along with the Radio Amateur Satellite Corporation (AMSAT), the American Radio Relay League (ARRL), the Russian Space Agency and NASA.


When will SuitSat orbit over your home town?

Use Science@NASA's J-Pass utility to find out. The online program will ask for your zip code—that's all. Then it will tell you when the ISS is going to orbit over your area. (Be sure to click the "options" button and select "all passes.") Because the ISS and SuitSat share similar orbits, predictions for one will serve for the other. Observers in the United States will find that SuitSat passes overhead once or twice a day—usually between midnight and 4 o'clock in the morning. At that time of day, SuitSat and the ISS will be in Earth's shadow and, thus, too dark to see with the naked eye. You'll need a radio to detect them.

"Point your antenna to the sky during the 5-to-10 minute flyby," advises Bauer, and this is what you'll hear:

SuitSat transmits for 30 seconds, pauses for 30 seconds, and then repeats. "This is SuitSat-1, RS0RS," the transmission begins, followed by a prerecorded greeting in five languages. The greeting contains "special words" in English, French, Japanese, Russian, German and Spanish for students to record and decipher. (Awards will be given to students who do this. Scroll to the "more information" area at the end of this story for details.)

Next comes telemetry: temperature, battery power, mission elapsed time. "The telemetry is stated in plain language—in English," says Bauer. Everyone will be privy to SuitSat's condition. Bauer adds, "Suitsat 'talks' using a voice synthesizer. It's pretty amazing."

The transmission ends with a Slow Scan TV picture. Of what? "We're not telling," laughs Bauer. "It's a mystery picture." (More awards will be given to students who figure out what it is.)

Bauer expects SuitSat's batteries to last 2 to 4 days. "Although longer is possible," he allows. After that, SuitSat will begin a slow silent spiral into Earth's atmosphere. Weeks or months later, no one knows exactly when, it will become a brilliant fireball over some part of Earth—a fitting end for a trailblazer.

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Subaru
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文章 Subaru » 週六 28 1月, 2006 17:44

阿APO兄係拿曬牌的專業人士, 不如等佢講解嚇.

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clcwong
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文章 clcwong » 週六 28 1月, 2006 18:02

Students and teachers: How do you get your Suitsat awards? Frank Bauer explains:

"Those that hear SuitSat should send their signal reports with a large (9x12 inch) self-addressed stamped envelope to one of the addresses listed below:"

想問問singal reports係指怎樣呀...??

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Astrocat
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文章 Astrocat » 週六 28 1月, 2006 18:35

我都係持牌人士, 有國際認可既call sign. 不過我都未玩過Amateur Satellite

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Astrocat
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文章 Astrocat » 週六 28 1月, 2006 18:37

clcwong 寫:Students and teachers: How do you get your Suitsat awards? Frank Bauer explains:

"Those that hear SuitSat should send their signal reports with a large (9x12 inch) self-addressed stamped envelope to one of the addresses listed below:"

想問問singal reports係指怎樣呀...??
應該係指QSL card

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clcwong
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文章 clcwong » 週六 28 1月, 2006 18:39

唔識玩tim...有冇人可以教下呀..好想去試下^^

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Astrocat
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文章 Astrocat » 週六 28 1月, 2006 18:40

clcwong 寫:唔識玩tim...有冇人可以教下呀..好想去試下^^
玩Ham? 你要考佐牌先

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clcwong
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文章 clcwong » 週六 28 1月, 2006 18:43

即係要做到li次d野..要有牌先得ma..?
係呢..可以比d相關ge網站我cc??^^

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Astrocat
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文章 Astrocat » 週六 28 1月, 2006 19:05

clcwong 寫:即係要做到li次d野..要有牌先得ma..?
係呢..可以比d相關ge網站我cc??^^
香 港 業 餘 無 線 電 考 試 (HKRAE)
http://www.radio.edu.hk/
http://www.ofta.gov.hk/zh/rae/Rae-c.html

考佐之後可以去OFTA申請業餘牌照. 另外, 好似英國既City & Guilds 既業餘無線電考試都可以拿OFTA牌, 不過好似依家香港無得考.

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Astrocat
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文章 Astrocat » 週六 28 1月, 2006 19:17

clcwong 寫:即係要做到li次d野..要有牌先得ma..?
係呢..可以比d相關ge網站我cc??^^
依單野係剩receive, 應該唔洗拿牌.

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clcwong
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文章 clcwong » 週六 28 1月, 2006 19:39

唔該曬astrocat..
唔知今次要做記錄..應該要點呢?
未試過so唔太識..if can..hope可以教下..then等大家都試下~

and what is a Slow Scan TV picture?

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Astrocat
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文章 Astrocat » 週六 28 1月, 2006 20:16

clcwong 寫: and what is a Slow Scan TV picture?
http://en.wikipedia.org/wiki/Slow-scan_television

I have never tried. I believe it's not popular at all among amateur.

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Astrocat
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文章 Astrocat » 週六 28 1月, 2006 20:18

As a radio amateur, I am interested in the project like Radio Jove and Radio Meteor.

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Subaru
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文章 Subaru » 週六 28 1月, 2006 23:09

Astrocat 寫:我都係持牌人士, 有國際認可既call sign. 不過我都未玩過Amateur Satellite
我重未搵到有邊範係首領大人唔識嘅. 8)

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Astrocat
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文章 Astrocat » 週日 29 1月, 2006 01:55

Subaru 寫:
Astrocat 寫:我都係持牌人士, 有國際認可既call sign. 不過我都未玩過Amateur Satellite
我重未搵到有邊範係首領大人唔識嘅. 8)
掃兄, 你過譽了. 我還有好多野要向你學習呢. :)

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