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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BK5XIODD3KHAGNHFDIAUCHC662EKZEJR/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "BK5XIODD3KHAGNHFDIAUCHC662EKZEJR",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/X53Q3MN2PFGMWEGLLISWCOK22E4ZLXAR/?format=api",
    "sender": {
        "address": "dave (a) g4dpz.me.uk",
        "mailman_id": "4cd84fbc2bba4f1893957af5ac1686f4",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/4cd84fbc2bba4f1893957af5ac1686f4/emails/?format=api"
    },
    "sender_name": "David Johnson",
    "subject": "[amsat-bb] Re: A0 40 replacement - mode K cubesat?",
    "date": "2013-09-05T08:15:39Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/X53Q3MN2PFGMWEGLLISWCOK22E4ZLXAR/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi,\n\nZACUBE is a HF beacon. Something like this may be a foundation for what \nyou're suggesting.\n\nhttp://amsat-uk.org/2012/08/25/14099-khz-cput-cubesat-to-launch-end-of-november/\n\nIt's riding along with FUNcube in the same POD. Take a look at this \npage, about half way down you'll see the ZACUBE deployment mechanism.\n\nhttp://amsat-uk.org/2013/09/04/funcube-1-is-in-its-pod/\n\n73\n\nDave\n\nOn 05/09/13 08:09, Ross Whenmouth wrote:\n> Hi,\n>\n> How feasible is it to fly a mode K (15m uplink, 10m downlink) linear \n> transponder on a cubesat?\n>\n> I expect that retty much any ham with an HF transceiver would be able \n> to work this bird, and I expect that due to the lower frequency, the \n> footprint might be a bit larger than that of VHF/UHF bird in the same \n> orbit and doppler shift would only be about 7% of that experienced on \n> 70cm.\n>\n> The biggest problem that I see though is squeezing a somewhat \n> efficient 10m antenna into a cubesat and deploying it by remote \n> control once on orbit. (I think that the cubesat antenna should be \n> optimised for TX performance, as cubesat TX EIRP capability is \n> severely limited compared to the average HF transceiver).\n>\n> Would two 2.5m lengths of steel tape (the same stuff that tape \n> measures are made out of) - mounted on opposing sides of the cubesat, \n> be able to unroll in microgravity to form a generally straight 1/2 \n> wave dipole with a low risk of tangling, snagging or kinking, etc?\n>\n> Alternately, what about using some sort of thin plastic tubing \n> (something like dialysis tubing, but suited to the space environment?) \n> with a wire inside it, and rolled up. Then, once on orbit, the tubing \n> is inflated with self-expanding polyurethane foam, which will extend \n> the tube (and the wire inside it). The foam will then harden, so \n> future loss of gas pressure in the plastic tube (micrometeorites?) \n> will not cause failure of the antenna?\n>\n>\n> 73 ZL2WRW Ross Whenmouth\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite \n> program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n",
    "attachments": []
}