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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SK5O5H4O2Q57NDT6BLHCZO22SXFC2TOG/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "SK5O5H4O2Q57NDT6BLHCZO22SXFC2TOG",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/SK5O5H4O2Q57NDT6BLHCZO22SXFC2TOG/",
    "sender": {
        "address": "tjoppen (a) acc.umu.se",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Tomas Härdin",
    "subject": "[amsat-bb] Suitable transceivers for Earth-Moon communication? And a question about allocations",
    "date": "2016-02-04T22:05:26Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi\n\n(attempt #3 at sending this mail. maybe this list doesn't allow\nattachments?)\n\nTomas SA2TMS here. I am involved in a group that's trying to put\ntogether a scientific probe that will hitch a ride to the moon,\ncourtesy of PTscientists (one of the Lunar XPrize teams) [1,2]. One of\nmy major concerns is how get a reliable backup link going for running\noperations during the lunar night. The lander acts as downlink relay\nduring the lunar day, but is not available during the night (and likely\nnot after the night either). Hence the need for a secondary link.\n\nThroughput requirements are quite modest, as little as 10-100 bits/s\nmay be acceptable. There is an average of around 800 mW of electrical\npower available. The geometry is somewhere between a 4U and 5U CubeSat.\n\nI have two questions for this list, assuming it's the right place to\nask them:\n\n1) What are some transceivers that may be suitable for this problem? I\nhave found some candidates, but I'm interested in hearing more\nsuggestions. The path loss is obviously quite significant (197 dB on\n70cm). Choice of band(s) comes down to possible antenna geometries. 2m\nis a bit on the low side for a dipole to fit (it'd have to fold). 70cm\nis OK. At 23cm and above patch antennas start to become feasible (a\nhuge plus).\n\n2) Where do I go to apply for frequency allocations in the amateur\nsatellite bands? Some sources say IARU, some say AMSAT. Others indicate\nI should talk to my national agencies (PTS, SSA).\n\nThat's all for now. If you have any questions, ask :)\n\n/Tomas\n\n[1] http://scube.se\n[2] http://ptscientists.com/\n",
    "attachments": []
}