Astra 1D

Astra 1D was the fourth, and under original plans, last communications satellite from Société Européenne des Satellites (SES), now SES Astra. It was launched to Astra's original solitary operational position at 19.2°E, and was intended as an in-orbit spare for Astra's 1A, 1B and 1C. However, demand for additional capacity for both British and German television channels, plus the extension of the receivable segment of the Ku band by 250 MHz on most consumer equipment led to the satellite becoming regularly used, and the launch of a further four Astra 1 satellites. The launch of these later craft returned 1D to a role as a "troubleshooter" for the Astra fleet.

It later served two periods as a spare at the Astra 28.2°E position colocated with Astra 2A, during mid-1998 and for most of 2000. Inbetween these two periods, it returned to the Astra 19.2°E position. During this time, some small numbers of transponders were used for regular service. After other Astra craft (Astra 2B, Astra 2D) either arrived or were ordered for the slot, it moved to 24.2°E where it spent almost two years carrying little more than test cards or feeds, until a move to 23°E (September 2003) and then 23.5°E (November 2004) [cite web |url=http://www.tbs-satellite.com/tse/online/sat_astra_1d.html|title=Astra 1D factsheet|publisher=The Satellite Encyclopedia | accessmonthday= September 22 |accessyear=2008] where Euro1080 began to use it as their main transmitting craft.

As of November 11 2007, Astra 1D has been replaced at the Astra 23.5°E position by Astra 1E, which has taken on the services carried by its predecessor. Astra 1D is still in orbit and it is currently at the Astra 31.5°E position, in inclined orbit and colocated with Astra 5A.

When the satellite originally went on air, several of its transponders were used by British Sky Broadcasting for new channels such as Granada Plus. Since these channels used frequencies that were not available on the original Sky receivers due to being outside the original BSS band, Sky issued viewers with frequency shifters ("ADX Plus Channel Expanders"), comprising small boxes the size of a cigarette packet with a single switch and an on/off LED. When connected between the dish and the receiver (and powered by the receiver) these allowed viewers to switch manually between the Astra 1A and Astra 1D frequency bands - precisely 250 MHz.

References

ee Also

*Astra 5A co-located satellite
*Astra 31.5°E orbital position
*SES Astra satellite owner

External Links

* [http://www.ses-astra.com SES Astra Website]
* [http://www.ses-astra.com/consumer/en/how-to-receive-astra/index.php SES Astra guide to receiving Astra satellites]
* [http://www.flysat.com/astra1d.php Astra 1D Frequency chart on FlySat.com]


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  • Astra 19.2°E — is the name for the group of communications satellites co located at the 19.2°East orbital position in the Clarke Belt that are owned and operated by SES Astra, a subsidiary of SES based in Betzdorf, Luxembourg.Astra 19.2°E used to be commonly… …   Wikipedia

  • Astra 23.5°E — is the name for the group of communications satellites co located at the 23.5° East position in the Clarke Belt owned and operated by SES Astra, a subsidiary of SES based in Betzdorf, Luxembourg. 23.5° East is one of the major TV satellite… …   Wikipedia

  • Astra 28.2°E — is the name for the group of communications satellites co located at the 28.2° East position in the Clarke Belt that are owned and operated by SES Astra, a subsidiary of SES based in Betzdorf, Luxembourg. It is one of the major TV satellite… …   Wikipedia

  • Astra — (lat. für „Sterne“) bezeichnet: Astra (Bier), eine Biermarke der Holsten Brauerei AG Astra (Buchungsmaschine), eine mechanische Buchungsmaschine Astra II, ein Kreuzfahrtschiff ein ursprünglich in Frankreich gebautes und später in Russland… …   Deutsch Wikipedia

  • Astra 5°E — is the name for the communications satellites co located at the 5° East position in the Clarke Belt which are owned and operated by SES Astra, a subsidiary of SES based in Betzdorf, Luxembourg. 5° East is one of the major TV satellite positions… …   Wikipedia

  • Astra 2D — is one of a group of satellites operated by SES Astra, located at 28.2° East in the Clarke Belt. It is a Hughes HS 376 craft, and was launched from the Guiana Space Centre in December 2000.Most of the transponders are used to provide television… …   Wikipedia

  • Astra 2A — is a communications satellite owned by SES Astra. Launched in 1998, half its expected end of life capacity of 28 transponders were pre booked by BSkyB, who utilised it and a re positioned Astra 1D to launch their new Sky Digital service. 21… …   Wikipedia

  • ASTRA — (lat. für „Sterne“) steht für: Astra (Band), eine Musikgruppe Astra (Buchungsmaschine), eine mechanische Buchungsmaschine Astra (Satellit), mehrere von SES Astra betriebene Satelliten ein ursprünglich in Frankreich gebautes und später in Russland …   Deutsch Wikipedia

  • Astra 1A — Startdatum 11. Dezember 1988 Trägerrakete Ariane 4 Startplatz ELA 2, Weltraumzentrum Guayana Startmasse 1800 kg Hersteller …   Deutsch Wikipedia

  • Astra 1B — Startdatum 2. März 1991 Trägerrakete Ariane 44LP Startplatz ELA 2, Weltraumzentrum Guayana Startmasse 2617 kg Hersteller …   Deutsch Wikipedia


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