{"id":242727,"date":"2016-09-07T14:38:08","date_gmt":"2016-09-07T18:38:08","guid":{"rendered":"http:\/\/amsat-uk.org\/?p=30639"},"modified":"2016-09-07T14:38:08","modified_gmt":"2016-09-07T18:38:08","slug":"5-ghz-to-10-ghz-lunar-transponder-mission","status":"publish","type":"post","link":"https:\/\/spaceweekly.com\/?p=242727","title":{"rendered":"5 GHz to 10 GHz Lunar Transponder Mission"},"content":{"rendered":"

\"View<\/a>AMSAT-NA plan a satellite carrying transponders for 5 GHz to 10 GHz that is expected to launch into a Lunar orbit in September 2018.<\/p>\n

Heimdallr<\/strong> is a\u00a03 axis stabilized 6U CubeSat with a mass of approximately 8 kg. It will have a Cold Gas Thruster for inertia dump and a star tracker for navigation. Deployable, gimbled solar panels will produce up to 100 watts of DC power, electric propulsion will be used to achieve lunar orbit.<\/p>\n

There will be a combination of omni and directional patch antennas on one side of spacecraft.<\/p>\n

The first part of mission is to provide Telemetry, Tracking, and Command (TT&C) to obtain lunar orbit. The second part is to perform the data downlink experiment while the final part is to provide a two way regenerative repeater and analog repeater in lunar orbit for lifetime of satellite.<\/p>\n

Proposing these downlinks:
\n\u2022 Omni transponder: 10.451 GHz +\/- 0.5 MHz
\n\u2022 Directional transponder: 10.4575 GHz. +\/- 3.5 MHz
\n\u2022 Analog transponder: 10.4665 GHz. +\/- 2.0 MHz<\/p>\n

For the first part of the mission (TT&C) using 300 bps BPSK 1\/2 rate viterbi Ranging 1.5 Mbps BPSK DSSS. For the\u00a0 second part of mission 4.5 Mbps QPSK \u00bd rate DVB-S2. For the final part of mission 25 kbps BPSK 1\/5 rate DVB-S2.<\/p>\n

Proposing these Uplinks
\n\u2022 Omni transponder: 5.651 GHz +\/- 0.5 MHz
\n\u2022 Directional transponder: 5.6575 GHz. +\/- 3.5 MHz
\n\u2022 Analog transponder: 5.665 GHz. +\/- 2 MHz<\/p>\n

A link budget is available at
\nhttps:\/\/drive.google.com\/folderview?id=0B3u-mSOWBMISYnZyZGJpeThKeU0&usp=sharing<\/a><\/p>\n

It is anticipated that a 1 or 2 metre dish will be required using the AMSAT designed ground station equipment.<\/p>\n

Source IARU Satellite Frequency Coordination Status pages http:\/\/www.amsat.org.uk\/iaru\/<\/a><\/p>\n

 <\/p>\n

\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

AMSAT-NA plan a satellite carrying transponders for 5 GHz to 10 GHz that is expected to launch into a Lunar orbit in September 2018. Heimdallr is a 3 axis stabilized 6U CubeSat with a mass of approximately 8 kg. It will … Continue reading →<\/span><\/a>\"\"<\/p>\n","protected":false},"author":51,"featured_media":615444,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-242727","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-AMSAT"],"_links":{"self":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts\/242727","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/users\/51"}],"replies":[{"embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=242727"}],"version-history":[{"count":4,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts\/242727\/revisions"}],"predecessor-version":[{"id":242852,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts\/242727\/revisions\/242852"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/media\/615444"}],"wp:attachment":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=242727"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=242727"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=242727"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}