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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MKUOTSQVEPWDFPE5QRX7HEFCKZKKRW46/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "MKUOTSQVEPWDFPE5QRX7HEFCKZKKRW46",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/MKUOTSQVEPWDFPE5QRX7HEFCKZKKRW46/",
    "sender": {
        "address": "ross (a) topwire.co.nz",
        "mailman_id": "d9ef72508cbd4a2b812c57a87b7ef26a",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d9ef72508cbd4a2b812c57a87b7ef26a/emails/"
    },
    "sender_name": "Ross Whenmouth",
    "subject": "[amsat-bb] Re: A0 40 replacement - mode K cubesat?",
    "date": "2013-09-05T07:09:37Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi,\n\nHow feasible is it to fly a mode K (15m uplink, 10m downlink) linear \ntransponder on a cubesat?\n\nI expect that pretty much any ham with an HF transceiver would be able \nto work this bird, and I expect that due to the lower frequency, the \nfootprint might be a bit larger than that of VHF/UHF bird in the same \norbit and the Doppler shift would only be about 7% of that experienced \non 70cm.\n\nThe biggest problem that I see though is squeezing a somewhat efficient \n10m antenna into a cubesat and deploying it by remote control once on \norbit. (I think that the cubesat antenna should be optimised for TX \nperformance, as cubesat TX EIRP capability is severely limited compared \nto the average HF transceiver).\n\nWould two 2.5m lengths of steel tape (the same stuff that tape measures \nare made out of) - mounted on opposing sides of the cubesat, be able to \nunroll in microgravity to form a generally straight 1/2 wave dipole with \na low risk of tangling, snagging or kinking, etc?\n\nAlternately, what about using some sort of thin plastic tubing \n(something like dialysis tubing, but suited to the space environment?) \nwith a wire inside it, and rolled up. Then, once on orbit, the tubing is \ninflated with self-expanding polyurethane foam, which will extend the \ntube (and the wire inside it). The foam will then harden, so future loss \nof gas pressure in the plastic tube (micrometeorites?) will not cause \nfailure of the antenna?\n\n\n73 ZL2WRW Ross Whenmouth\n",
    "attachments": []
}