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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WHDC2EEHEE3GT5LSXSGHPD2PLXYU5QB4/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "000a01c7d76f$97055800$0200a8c0@Tanguray",
    "message_id_hash": "WHDC2EEHEE3GT5LSXSGHPD2PLXYU5QB4",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/5FEUV2NODGW24WPUEJU3INKNY2SIBYYY/?format=api",
    "sender": {
        "address": "rogerkola (a) aol.com",
        "mailman_id": "8323dbe496014835b5bd2be9b5ff6f66",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/8323dbe496014835b5bd2be9b5ff6f66/emails/?format=api"
    },
    "sender_name": "Roger Kolakowski",
    "subject": "[amsat-bb] Re: AO-7 report.- Band switching",
    "date": "2007-08-05T14:47:41Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ICTRI4RLLU3WCM6XCA7RG4WNSD7Y3WVR/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7SWRF5WEOWWTATXEKANGHZLKAPKUQEJB/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "James Duffey queried...\n\n>\"When AO-7 is powered all the time doesn't the on board\n> housekeeping unit control the mode and switch between mode A and Mode B?\"\n\n\n\"The following information is from AMSAT NEWSLETTER dated Sept 1974\n\nThe two repeaters are operated alternately by means of a timer arrangement,\nbut repeater selection and output power control can also be accomplished by\nground command.\"\n\nAnd . \"from Jan King, W3GEY, who provided the following information in an\nemail ...\n\nIt appears that the 24 hour clock that would cycle the transponders between\nmodes A and B is working but, it gets reset every time the satellite goes\ninto eclipse\"\n\nWhich by my understanding, will produce a change of mode from A to B (or B\nto A if you prefer) every 24 hours with no eclipse event. I believe there\nhave been cases where excessive power drain (usage) has resulted in a mode\nchange mid-timer, but I haven't been able to document that.\n\nRoger\nWA1KAT\n\n----- Original Message ----- \nFrom: \"James Duffey\" <[email protected]>\nTo: <[email protected]>\nCc: <[email protected]>; <[email protected]>\nSent: Sunday, August 05, 2007 11:32 AM\nSubject: [amsat-bb] Re: AO-7 report.\n\n\n> John  - When AO-7 is powered all the time doesn't the on board\n> housekeeping unit control the mode and switch between mode A and Mode B?\n>\n> Having a full time Mode B LEO linear transponder is great, in my\n> opinion, having a Mode A LEO one will be even better. - Duffey\n> On Jul 31, 2007, at 5:32 AM, John Hackett wrote:\n>\n> A study of the AO-7 eclipse charts for the last 3 years shows a\n> progression\n> toward non-elipse orbits in late 2007 - 2008.\n>\n> In effect, this means that AO-7 in all probability will not change mode\n> unless anything untoward happens.\n>\n> It also means that we appear to have a permanent mode-B LEO linear\n> transponder for the forseeable future ... providing operators follow the\n> recommended operating proceedure.\n>\n> Please *do* decrease your power as the satellite approaches TCA to\n> avaoid\n> FM'ing.\n>\n> This not only helps the satellite, it helps the other operators in the\n> passband.\n>\n> Don't be fooled by propagation anomolies. The mode-B transponder is\n> working\n> well and will continue to do so providing the alligators go and play\n> somewhere else. Under normal circumstances you do NOT !! need a lot of\n> power. Please use only the necessary to maintain adequate\n> communications. If\n> you can't copy people adequately, you should improve your receiving\n> capabilities rather than increasing your uplink power ... remember,\n> aluminium is cheap and it's a lot more user friendly to everyone\n> concerned\n> .... with perhaps the exception of your neighbours.\n>\n> For all intents and purposes, AO-7 is a QRP satellite. Please treat\n> it as\n> such.\n>\n> 73 John.   <[email protected]>\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\n> program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\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\n",
    "attachments": []
}