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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MADGR5QIBTS5KPKL7CGAIV2TX4IV3BEB/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "003101c81f08$4b8fe4e0$6700a8c0@sparkys",
    "message_id_hash": "MADGR5QIBTS5KPKL7CGAIV2TX4IV3BEB",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/AAW7HH2ZOHV7SIDJN2UTVUIZMIF7UJWB/",
    "sender": {
        "address": "sparkycivic (a) shaw.ca",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Auke de Jong, VE6PWN",
    "subject": "[amsat-bb] Re: AO-7 Mode A difficulties",
    "date": "2007-11-04T17:29:46Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DRP35ZWY2XPQ4FHF52O6MO6ORAGU5IXW/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Is there any issue with using circular polarization for uplink to AO-7?  I \nhave heard that some sats prefer left-hand uplinks, while others prefer \nright-hand.  I presume that it is most likely linear-polarized up and down.\n\nPersonally, I think the big difference in modes could be to do with two \nissues:\n1: the transverter design is  very different between those modes, the mode B \nis the newer \"helaps \" design that is aparently very efficient compared to \nconventional designs such as what makes up the mode-A portion.  This might \nbe enough to make a difference in being heard in ssb.  Since there's limited \npower from the aging solar panels, it seems logical to assume that the \nless-efficient components would be struggling to work proplerly.\n2: There's likely a lot of broadband QRM making it up to space on the145 \nuplink... it would eat-up the available power without being detected unless \nyou used a spectrum scope on the entire downlink band.  Also consider that \nthe mode-A transverter is twice the bandwidth of the mode-B(50kHz compared \nto 100kHz), therfore there's twice as much input noise getting to the \namplifier and hogging-up the available power even under ideal conditions.\n\nI hope that this helps,\nAuke, VE6PWN\n\n\n----- Original Message ----- \nFrom: \"Robert Turlington\" <[email protected]>\nTo: \"Bob Stewart\" <[email protected]>\nCc: \"Amsat Buleitin Board\" <[email protected]>\nSent: Sunday, November 04, 2007 1:21 AM\nSubject: [amsat-bb] Re: AO-7 Mode A difficulties\n\n\n\nHi Bob\nyou are not the only one that struggles with AO7 mode A,I find that even 30w \ninto a 6 el Quad pointed at the bird gives a good downlink ,it also depends \non how good your Rx antenna is as well as things like background noise \nlevels.Regards Robert G8ATE > Date: Sat, 3 Nov 2007 16:18:10 -0700> From: \[email protected]> To: [email protected]> Subject: [amsat-bb] AO-7 Mode A \ndifficulties> > I've made several attempts efforts to work AO-7 on > Mode A, \nbut I just don't seem to be able to manage it. > I can hear CW signal, and \nif I whistle into the mike, but I > just can't hear my voice well enough to \neven attempt a > QSO.> > I'm using an 80 watt Mirage brick into an RHCP \nmoxon > pair pointed straight up. I don't have any problems getting > into \nthe FM sats with this setup. Is it because I'm only getting > about 40 watts \nEIRP from this and that's simply not enough> for AO-7 Mode A?> > Bob - \nAE6RV> _______________________________________________> Sent via \[email protected]. Opinions expressed are those of the author.> Not an \nAMSAT-NA member? Join now to support the amateur satellite program!> \nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n_________________________________________________________________\nCeleb spotting – Play CelebMashup and win cool prizes\nhttps://www.celebmashup.com\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-- \nInternal Virus Database is out-of-date.\nChecked by AVG Free Edition.\nVersion: 7.5.503 / Virus Database: 269.15.12 - Release Date: 10/26/2007 \n12:00 AM\n\n\n",
    "attachments": []
}