home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!usc!zaphod.mps.ohio-state.edu!uwm.edu!ogicse!das-news.harvard.edu!cantaloupe.srv.cs.cmu.edu!crabapple.srv.cs.cmu.edu!rcs@cs.arizona.edu
- From: rcs@cs.arizona.edu (Richard Schroeppel)
- Newsgroups: sci.space
- Subject: Galileo antenna questions
- Message-ID: <C051E7.DxB.1@cs.cmu.edu>
- Date: 31 Dec 92 19:11:24 GMT
- Article-I.D.: cs.C051E7.DxB.1
- Sender: news+@cs.cmu.edu
- Distribution: sci
- Organization: [via International Space University]
- Lines: 19
- Approved: bboard-news_gateway
- X-Added: Forwarded by Space Digest
- Original-Sender: isu@VACATION.VENARI.CS.CMU.EDU
-
- Ron Baalke has passed on the report that the Galileo antenna
- didn't open in response to repeated hammering on the deployment
- mechanism.
-
- My first question: Is the hammering at a constant frequency?
- Why not vary the frequency continuously in a "chirp", hoping to
- find a resonance that vibrates the whole antenna? If there are
- any springs in the ribs, there may be a resonance in the 1 second
- time range.
-
- My second question: During the quick-look playback of the first
- Gaspra pictures, shortly after the encounter, there was a lot of
- concern for wear on the tape-recorder rewind mechanism. Many
- rewinds were required to play back a few pictures. Is this still
- a concern? How will the Ida data playback be managed (at 10 baud),
- and the images from Jupiter & the moons? What will the data rate
- be from the vicinity of Jupiter?
-
- Rich Schroeppel rcs@cs.arizona.edu
-