Voyager Spacecraft Hardware |
Voyager Spacecraft Hardware |
Guest_PhilCo126_* |
Jan 3 2006, 06:37 PM
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#1
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Guests |
Some questions on the basic hardware of the Voyager spacecraft:
1. From which material was the decahedral space bus made ( Aluminium ? ) 2. Exact weight of the spacecraft - literature gives numbers between 792 and 825 kilograms ? Some additional questions: 1. The Deep Space Network of worldwide antenna sites wasn't sufficient to collect the faint signal of the distant spacecraft once beyond Saturn ... I know that the twenty-seven 25-meter steerable radio antennes of the Very Large Array in New Mexico were linked with DSN ... when was this done exactly? ( 1989 Neptune encounter only ? ) 2. What is the actual telecommunications time-lag 1-way to Earth (after having passed the bow-shock ) |
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Nov 20 2008, 08:51 PM
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#2
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Junior Member Group: Members Posts: 63 Joined: 18-November 08 Member No.: 4490 |
I was wondering if anyone knew the memory capacity & specs of the Digital tape recorder (DTR) onboard Voyager? I can't find it on the usual NASA sites. I know that they uploaded new image compression software on one of the "spare" 1802 processors for the Uranus/Neptune flyby to increase the number of images captured and save DSN time. Are there JPG type artifacts on those images, or was it just lossless RLE/Huffman type encoding?
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Nov 20 2008, 09:35 PM
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#3
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Senior Member Group: Members Posts: 2920 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
I was wondering if anyone knew the memory capacity & specs of the Digital tape recorder (DTR) onboard Voyager? I can't find it on the usual NASA sites. I know that they uploaded new image compression software on one of the "spare" 1802 processors for the Uranus/Neptune flyby to increase the number of images captured and save DSN time. Are there JPG type artifacts on those images, or was it just lossless RLL/Hoffman type encoding? I've got some infos 'sci44'. There are from JPL Publication 89-24, june 1,1989 "The Voyager Neptune Travel Guide". "The DTR has three speeds in use at Neptune encounter (...) 115.2 Kbps (record only), 21.6 Kbps (playback only) and 7.2 Kbps (both record and playback). There are 8 tracks on the DPR. Each of these can hold 12 images if only images are recorded" (...) "It's important to play back quickly so that the tape recorder can be filled again. But, playbacks interfere with science gathering and require certain DSN configurations that are not always available". I hope it helps. -------------------- |
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