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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZTRIKM2WGRL4DGOT2NNTRDVGZDKMMQHS/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "6510640C1FB44051AEC9B06D02A1B589@WA4SCA",
    "message_id_hash": "ZTRIKM2WGRL4DGOT2NNTRDVGZDKMMQHS",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/Y3FFAGRIY7TGMNE2CY7YMAY7MST5PPZM/",
    "sender": {
        "address": "APBIDDLE (a) UNITED.NET",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Alan P. Biddle",
    "subject": "[amsat-bb] Re: L and S-band Options",
    "date": "2010-05-08T18:34:12Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/Y3FFAGRIY7TGMNE2CY7YMAY7MST5PPZM/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Guy,\n\nMode-L is not authorized for transmission FROM a spacecraft, only TO one.\nSo you only need TX capability.  Of course the rigs you mentioned will give\nyou the needed TX capability.  A cheaper way would be to find a used\ntransverter.  Note that unless it was designed for satellite use, it will\nprobably need new crystals and tuning.  In principle an HT which covers\nmode-L, combined with an amp and good antenna, would work for an uplink.\nHowever, the Doppler shift is so large, and changes so rapidly, that you\nneed computer control.  It CAN be done without that, but it is painful for\nyou, and more painful for the people you might work.\n\nA helical antenna, easily made and uncritical, can be made for either mode-L\nor mode-S for a few dollars.  Likewise, there are still a few of the old MDS\nconverters around.  AO-51 has a very loud downlink, and can even be heard on\na simple patch antenna without a dish, or a short Yagi.\n\nAlan\nWA4SCA\n\n\n \t \n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of Guy Brauning\nSent: Saturday, May 08, 2010 11:09 AM\nTo: [email protected]\nSubject: [amsat-bb] L and S-band Options\n\nThanks for reading this message.  I know there has been a lot of information\non the BB over the past couple of years about operating L and S band on\nAO-51; however, I was focused on V/U at the time and I didn't make notes of\nthe information.  Now I would like to experiment with these two bands and I\nam looking for some recommendations to get started.  Is the Alinco DJ-G7T a\nviable option for receiving the AO-51 L-band downlink (Pricey at $320.00 but\nit does cover 3 satellite bands with advertised full-duplex capability)?  If\nnot (and ruling out the more expensive (and effectively non-portable)\ntransceivers.. TS-2000 / IC-910H, etc.), what would be the least expensive\nway to have receive capability on 1.2 Ghz... a down-converter perhaps?  (I\ncurrently have a Yaesu FT-60R dual band HT and a Yaesu FT-817D along with\nthe Arrow and ELK antennas for V/U)  Also, what are some options for\nhomebrew 1.2 Ghz antennas (I do not have sophisticated test equipment and my\n\"Skills\" are minimal)?  On to 2.4 Ghz.... what are some options for\ninexpensive 2.4 Ghz down-converters (As a reference..I do not consider the\nSSB UEK-3000 inexpensive at $500.00) and homebrew antennas?  I would like to\nbe able to experiment with handheld / portable gear in the yard to gain some\nexperience with these two bands.\n\n \n\nGuy Brauning\n\nN3SCR\n\[email protected]\n\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n\n",
    "attachments": []
}