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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6FCUVENFKG45Y6RGGAFW4SJW4QIZ4HG4/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "6FCUVENFKG45Y6RGGAFW4SJW4QIZ4HG4",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/TEL4MHF57T3S2XOCPA3AS2RAGNCGJVJD/",
    "sender": {
        "address": "ko6th_greg (a) hotmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Greg D.",
    "subject": "[amsat-bb] Re: L and S band antennas",
    "date": "2009-04-18T22:07:32Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TEL4MHF57T3S2XOCPA3AS2RAGNCGJVJD/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\nHi James,\n\nThe current mode L/US on AO-51 is really fantastic.  Having the dual downlink lets you confirm on 70cm that you're getting through on the L-band uplink, while you are madly fishing around the 2.4 ghz band to find your signal there.  There's nothing more maddening than having to deal with a whole pile of unknowns, any (and all) of which will prevent success.  Then next week (now that you've got the hang of 13cm), it switches to V/S.  (Kudos to the AO-51 command team!)\n\nBut, I think you're still going to have a hard time with the L uplink.  Your 23cm HT is going to need a lot of antenna in order to get into AO-51, except under the best conditions.  I run 10 watts from my Yaesu 736R into an 18 turn helix.  There's a lot of cable in between the two, but most of it is 1/2\" hardline.  At low elevations, it takes all of that 10 watts to get through, though when the satellite is overhead I can turn it down a bunch.  Fortunately, helix antennas are easy to make, and pretty forgiving in the exactness of construction.  \n\nFor 13cm receive, nothing beats a dish.  But if you want to go portable, you might bank on the fact that AO-51 is a lot closer than the other (in)famous S-band bird, AO-40 (RIP).  Where a dish was required for AO-40, I believe some have received AO-51 with just a helix.  You might Google around or search the BB Archives for references (or others - chime in!).\n\nGood luck!\n\nGreg  KO6TH\n\n\n\n> From: [email protected]\n> To: [email protected]\n> Date: Sat, 18 Apr 2009 20:05:11 +1200\n> Subject: [amsat-bb]  L and S band antennas\n> \n> As a relative \"newbie\" to satellites, all this talk about the current L/u mode on AO51, and next weeks V/s mode, looks like a lot of fun. I have 23cm tx and 13cm rx capability, but no antennas at present for either band. My current operating conditions are limited to portable operations only, and I wonder if any other list members can suggest/reccomend any hand held/portable/easily packed away designs that work well? (commercial or homebrew) As well as my 910H, I have a Kenwood TH-59 23cm HT, and I can confirm that 700 milliwatts into the HT's ducky won't cut it! (tried last night) Any suggestions welcome                        \n> regards and 73\n> James - ZL4JM\n> QRPARCI #13307\n> AMSAT #36899\n> RF70bs\n> \n> \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 program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n_________________________________________________________________\nWindows Live™: Keep your life in sync.\nhttp://windowslive.com/explore?ocid=TXT_TAGLM_WL_allup_1a_explore_042009",
    "attachments": []
}