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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XE7DP2HX7ABYT2OO4YFQ3ERQB63OE3G2/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "XE7DP2HX7ABYT2OO4YFQ3ERQB63OE3G2",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/LLZJS6556FQTXFQUO56RV6NPOIVCWU3C/?format=api",
    "sender": {
        "address": "vk3jed (a) gmail.com",
        "mailman_id": "e049fcabdd4648088cd7ce227ab7c655",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/e049fcabdd4648088cd7ce227ab7c655/emails/?format=api"
    },
    "sender_name": "Tony Langdon",
    "subject": "[amsat-bb] Re: VO-52, Linear transponders and FM",
    "date": "2007-04-23T23:04:39Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LLZJS6556FQTXFQUO56RV6NPOIVCWU3C/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "At 03:40 AM 4/24/2007, Bruce Robertson wrote:\n\n>I can't speak for the rest of the world, but I'd say that in this neck of\n>the woods, this approach has worked very well. I've only once or twice\n>heard an FM signal on VO-52, no more often than other birds, and rare\n>enough that I can assume it was by accident or ignorance.\n\nI haven't checked this bird myself, because I lack 70cm SSB \ngear.  Australia is in probably a more unusual situation.  We have a \nrelatively high penetration of VHF SSB gear, and a smaller, but \nsignificant amount of 70cm SSB radios out there.  However, we also \nhave a very low population density, compared to the US or Europe.  I \nknow when I was working RS-12/13, the only QSOs I had were those I \nhad pre-arranged with local operators.  It's much easier to find \nsomeone on FM.  I believe there are some working Hamsat on SSB, from \ntime to time, so it might be getting use here in SSB.  I doubt \nthere's much, if any FM activity on this bird, I think the convention \nfor this part of the world is SSB.\n\n\n>Given VO-52 success in this score, I wonder:\n>a) if the operators of other, future, LEO linear birds should likewise\n>permit their use in FM over appropriate regions of the globe. Since FM is\n>such a high duty cycle mode, I suspect usage and battery load statistics\n>from Hamsat might be helpful in guiding others' choices in this matter.\n\nLooks like there will be some useful lessons in here.\n\n\n>b) what advantage there is in launching a FM-only bird when a linear one\n>can be used in both modes. I assume there must be reasons of efficiency,\n>etc. since the designers of KiwiSat, for example, are making circuitry for\n>both modes.\n\nIndeed, though we would need to formalise arrangements a bit more \nthen.  For this part of the world, FM birds do serve a purpose, and \nthat would need to be reflected in the local bandplan for any future \nlinear satellites, if FM was going to be phased out.  In other words, \na CW/SSB/FM transponder bandplan in a 40-50 kHz bandwidth might be \nneeded here.  I'm sure a single FM QSO, 2 or 3 SSB QSOs and one or 2 \nin CW would happily coexist at the same time down here.  Might also \nbe room to experiment with managing the power sharing on a SDX as well.\n\nJust thinking out loud...\n\n73 de VK3JED\nhttp://vkradio.com\n\n",
    "attachments": []
}