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Telstar 401 Fails
Hi, seams TELSTAR 401 is missing...
Could shed some light on this.
Michael Tokarcik
Dr.Dish:
Peter Klanowski from TELE-satellit News got the answer:
>TELE-satellit News, 13 January 1997
>
>Telstar 401 Fails
> BEDMINSTER, New Jersey, USA, 97/01/13 (TS) -- AT&T suffered a major
>failure on its Telstar 401 satellite at 6:15am EST on Saturday morning. The
>operator lost both telemetry and communications links with the satellite
>causing the bird, at 97 degrees West, to shut-down with the loss of all
>services. Among networks affected were ABC, Fox and PBS.
>
> The company is apparently attempting to regain control of the satellite
>but has been unsuccessfull so far. The company restored programming for
>some customers on Telstar 402R, at 89 degrees West. Those moved were the
>companies that had a service restoration clause in their contracts. "AT&T
>and Lockheed Martin, the manufacturer of the satellite, are working to
>determine the root cause of the problem," said AT&T in a statement.
>
> TELE-satellit's Peter Klanowski provides this background: Apart from
>TELSTAR 401 and 402R, Skynet has just two older older TELSTAR satellites in
>service (302, launched 1984, 85 degrees West; and 303, launched 1985, 120
>degrees West) Both are already in a slightly inclined orbit, i.e. they
>aren't fully stabilised anymore.
>
> Space Systems/Loral is building two new replacement satellites which will
>have a payload of 24 Ku-band transponders with a power of 110W and 24
>C-band transponders with 20W each. The first of the TELSTAR 5 satellites is
>scheduled to be launched and in service in mid-1997.
>
> Telstar 401, launched on December 12, 1993, was built by Lockheed Martin.
>Its C- and Ku-band transponders cover all 50 states of the USA, Puerto Rico
>and the U.S. Virgin Islands.
>
> Losing control of a geostationary satellite is by no means a rare event.
>Although I don't keep an exact statistic on that, it seems that one or two
>GEO satellites per year can be considered a partial or total loss. With
>many more satellites being launched to a geostationary orbit, the failure
>rate will probably rise over the next few years.
>
> The latest spectacular failure happened in March 1996 when Telesat Canada
>temporarily lost control of its ANIK E1 satellite. Contact could be
>re-established a few days later, but up until now most of the spacecraft's
>capacity cannot be used. In November 1995, Deutsche Telekom's DFS 3 (FM 1)
>suffered a complete breakdown and started drifting uncontrollably. After
>being recaptured, it was soon declared a total loss and conveyed to a
>graveyard orbit.
>
> The following re-location chart was posted to Usenet by Anthony W. Haukap:
>
> Old Location --> New Location
>
>T401/03 Paramount Feeds --> Galaxy-IV(C)/10
>T401/06 Buena Vista Feeds --> Galaxy-IV(C)/02
>T401/08 PBS NPS Feed --> Telstar-402(KU)/08 [11.9230]
>T401/09 Fox Network Feed --> Telstar-402(C)/01
>T401/10 FOX Network Feed --> Telstar-402(C)/23
>T401/11 ABC Network Feed --> Galaxy-III(C)/15
>T401/12 ABC NewsOne Channel --> Telstar-402(C)/14
>T401/13 FOX Network East Feed --> Telstar-402(C)/17
>T401/14 FOX NewsEdge --> Telstar-402(C)/10
>T401/15 True Blue --> Anik-E2(C)/18
>T401/19 UPN East/West Feed --> Galaxy-IV(C)/22
>T401/20 ABC Network Feed --> Telstar-303(C)/19
>T401/21 ABC East Network Feed --> Telstar-402(C)/22
>T401/22 ABC West Network Feed --> Telstar-402(C)/21
>T401/23 ABC Network Feed --> Telstar-402(C)/08
>T401/24 Exxxtasy --> Anik-E2(C)/22
>
>(c)TELE-satellit 1996. All rights reserved.
>
>
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