[time-nuts] Re: VLBI
Tom Clark
w3iwi at toad.net
Thu Jul 7 05:53:07 UTC 2005
David Forbes wrote:
> At 12:06 AM -0400 7/7/05, Tom Clark wrote:
>
>> [As an aside, for many years until I retired, I headed NASA's VLBI
>> program -- [3]see more about the Goddard VLBI group here. You
>> might enjoy some of my tutorials on how the VLBI stations get their
>> UTC reference time so that their measurements of UT1-UTC can be
>> derived at the catch-all repository [4][1]http://gpstime.com ]
>>
>> Tom Clark
>
>
> Tom,
>
> With those credentials, you must know what a Mark IV Tape Drive is. We
> had one at the Submillimeter Telescope on Mt. Graham for a few years,
> till they replaced it with the Mark 5 box of hard disks.
>
> It's amazing how those things could write a hundred megabytes per
> second. I never saw it in operation, but I can imagine what it was
> like when the tape got loose - a mile of tape on the floor in a few
> seconds.
>
> [2]ftp://web.haystack.edu/pub/mark4/memos/230.2.pdf
Sure -- I know Mk3/4 well -- I was re$ponsible for its development. (If
you look in any of the Mk3/4 modules, you will see a card called the MAT
that enables the RS232 control of the modules. I wrote the 8085 code
running in the MAT back in 1978 as one of my personal contributions.)
I also got the Mk5 started "under my watch" & kept Haystack alive for 30+
years. I'm now on the Haystack's Board of Trustees and get up there several
times a year (including this year's Technical Operations Workshop=TOW).
At this year's TOW, I gave all the station people my myoptic view of the
history of VLBI -- a version can be fetched from Haystack at
[3]ftp://web.haystack.edu/pub/heidi/Notebook/ClarkLecture.pdf.
This presentation was an expanded version of a talk I gave originally in Feb'05
to the St. Petersburg (Russia) VLBI folks when they awarded me a Gold Medal
from the Russian Academy of Sciences. [4]My local weekly newspaper even gave th
e
medal award a nice writeup.
Tom
References
1. http://gpstime.com/
2. ftp://web.haystack.edu/pub/mark4/memos/230.2.pdf
3. ftp://web.haystack.edu/pub/heidi/Notebook/ClarkLecture.pdf
4. http://news.mywebpal.com/news_tool_v2.cfm?show=archivedetails&pnpid=573&om=1&ArchiveID=1101667&requesttimeout=100
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