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- AO-51 abstract "AO-51 is the in-orbit name designation of a now defunct (following battery failure) LEO amateur radio satellite of the OSCAR series; formerly known as ECHO, built by AMSAT. It was launched on June 29, 2004 from Baikonur Cosmodrome, Kazakhstan on a Dnepr launch vehicle. It is in sun synchronous low Earth orbit.AO-51 contains an FM repeater with both 144 MHz (V band) and 1.2 GHz (L band) uplinks and 435 MHz (U band) and 2.4 GHz (S band) downlinks. It also contains a digital subsystem that transmits telemetry on 70 cm and provides a complete PACSAT BBS that can be configured on both V band and S band uplinks. As well, there is a 10 meter PSK uplink.AO-51 has four VHF receivers, two UHF transmitters, six modems, and 56 channels of telemetry. The two UHF transmitters are connected to four phased antennas, yielding right-hand circular polarization for the 435.300 downlink and left-hand circular polarization for the 435.150 downlink.The AO-51 FM satellite was easily workable with an amateur radio VHF dual band hand-held radio, as long as you knew when the satellite's footprint was within reach. Transatlantic contacts had been made without much effort, as long as the satellite was approximately mid-Atlantic so that the edge of the satellites footprint was within reach on either continent.As of May 2011 the satellite faced problems with the battery. By September, a work around for the battery issue was found, bringing the repeater back in use. On November 29, 2011, the AO-51 Command Team announced that AO-51 has ceased transmission and is not responding to commands.".
- AO-51 cosparId "2004-025K".
- AO-51 thumbnail AO-51-2.jpg?width=300.
- AO-51 wikiPageExternalLink Home.html.
- AO-51 wikiPageExternalLink echo.
- AO-51 wikiPageExternalLink CTNews.php.
- AO-51 wikiPageExternalLink ao51.php.
- AO-51 wikiPageExternalLink kd-rules.html.
- AO-51 wikiPageExternalLink +%22amsat.org%22+AO-51&hl=en&lr=&strip=1.
- AO-51 wikiPageExternalLink HSblog.php?itemid=1624.
- AO-51 wikiPageID "949173".
- AO-51 wikiPageRevisionID "585795449".
- AO-51 apsis "gee".
- AO-51 cosparId "2004".
- AO-51 hasPhotoCollection AO-51.
- AO-51 launchContractor ISC_Kosmotras.
- AO-51 launchDate "--06-29".
- AO-51 launchRocket Dnepr-1.
- AO-51 launchSite Baikonur_Cosmodrome.
- AO-51 launchSite Baikonur_Cosmodrome_Site_109.
- AO-51 missionType "Amateur radio".
- AO-51 name "AO-51".
- AO-51 operator AMSAT.
- AO-51 orbitEccentricity "0.0082657".
- AO-51 orbitEpoch "--12-04".
- AO-51 orbitInclination "98.22".
- AO-51 orbitPeriod "5994.599999999999".
- AO-51 orbitReference Geocentric_orbit.
- AO-51 orbitRegime Low_Earth_orbit.
- AO-51 satcat "28375".
- AO-51 website echo.
- AO-51 subject Category:Amateur_radio_satellites.
- AO-51 subject Category:Artificial_satellites_orbiting_Earth.
- AO-51 type ArtificialSatellite.
- AO-51 type Satellite.
- AO-51 type Thing.
- AO-51 comment "AO-51 is the in-orbit name designation of a now defunct (following battery failure) LEO amateur radio satellite of the OSCAR series; formerly known as ECHO, built by AMSAT. It was launched on June 29, 2004 from Baikonur Cosmodrome, Kazakhstan on a Dnepr launch vehicle. It is in sun synchronous low Earth orbit.AO-51 contains an FM repeater with both 144 MHz (V band) and 1.2 GHz (L band) uplinks and 435 MHz (U band) and 2.4 GHz (S band) downlinks.".
- AO-51 label "AO-51".
- AO-51 label "AO-51".
- AO-51 label "OSCAR 51".
- AO-51 sameAs OSCAR_51.
- AO-51 sameAs AO-51.
- AO-51 sameAs m.03slfg.
- AO-51 sameAs Q4653126.
- AO-51 sameAs Q4653126.
- AO-51 wasDerivedFrom AO-51?oldid=585795449.
- AO-51 depiction AO-51-2.jpg.
- AO-51 homepage echo.
- AO-51 isPrimaryTopicOf AO-51.