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- Q4653126 subject Q5827867.
- Q4653126 subject Q8237633.
- Q4653126 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.".
- Q4653126 cosparId "2004-025K".
- Q4653126 thumbnail AO-51-2.jpg?width=300.
- Q4653126 wikiPageExternalLink CTNews.php.
- Q4653126 wikiPageExternalLink Home.html.
- Q4653126 wikiPageExternalLink echo.
- Q4653126 wikiPageExternalLink ao51.php.
- Q4653126 wikiPageExternalLink kd-rules.html.
- Q4653126 wikiPageExternalLink +%22amsat.org%22+AO-51&hl=en&lr=&strip=1.
- Q4653126 wikiPageExternalLink HSblog.php?itemid=1624.
- Q4653126 wikiPageWikiLink Q152466.
- Q4653126 wikiPageWikiLink Q1579577.
- Q4653126 wikiPageWikiLink Q174241.
- Q4653126 wikiPageWikiLink Q177477.
- Q4653126 wikiPageWikiLink Q181417.
- Q4653126 wikiPageWikiLink Q2018880.
- Q4653126 wikiPageWikiLink Q209867.
- Q4653126 wikiPageWikiLink Q210499.
- Q4653126 wikiPageWikiLink Q232.
- Q4653126 wikiPageWikiLink Q2362353.
- Q4653126 wikiPageWikiLink Q273693.
- Q4653126 wikiPageWikiLink Q2882172.
- Q4653126 wikiPageWikiLink Q295309.
- Q4653126 wikiPageWikiLink Q333760.
- Q4653126 wikiPageWikiLink Q455647.
- Q4653126 wikiPageWikiLink Q4652715.
- Q4653126 wikiPageWikiLink Q4843261.
- Q4653126 wikiPageWikiLink Q4874866.
- Q4653126 wikiPageWikiLink Q49674.
- Q4653126 wikiPageWikiLink Q5121676.
- Q4653126 wikiPageWikiLink Q5607.
- Q4653126 wikiPageWikiLink Q5607897.
- Q4653126 wikiPageWikiLink Q5827867.
- Q4653126 wikiPageWikiLink Q628096.
- Q4653126 wikiPageWikiLink Q663611.
- Q4653126 wikiPageWikiLink Q779460.
- Q4653126 wikiPageWikiLink Q8237633.
- Q4653126 cosparId "2004".
- Q4653126 type Place.
- Q4653126 type ArtificialSatellite.
- Q4653126 type CelestialBody.
- Q4653126 type Location.
- Q4653126 type Place.
- Q4653126 type Satellite.
- Q4653126 type Thing.
- Q4653126 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.".
- Q4653126 label "AO-51".
- Q4653126 depiction AO-51-2.jpg.
- Q4653126 homepage echo.