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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JRS2V3QJDJ3V2TBJ26PHA64HG22LZFZJ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "JRS2V3QJDJ3V2TBJ26PHA64HG22LZFZJ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FRSFKRSM6OXCFWCUNTG25UE6ECFY27P6/?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: Full band transverters for satellite  operations?",
    "date": "2007-06-12T20:26:02Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FRSFKRSM6OXCFWCUNTG25UE6ECFY27P6/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "At 12:47 AM 6/13/2007, Alan P. Biddle wrote:\n>With the advent of rigs like the FLEX-5000, features are becoming available\n>which exist in no traditional rig.  However, for operation on VHF, UHF, and\n>microwave frequencies, you are obviously going to need a transverter.  Using\n>a 28-30 MHz IF, you can cover 2 meters with 2 LO crystals.  However, once\n>you get to 70 cm, it would take 15 crystals to do this.  Now admittedly, you\n>wouldn't necessarily want to cover the entire band, as an FT-847, TS-2000,\n>etc do.  But you would want more flexibility than just one or two 2 MHz\n>segments for both space and terrestrial operations.  More if you wanted to\n>include basic FM repeaters.\n\nWell, as someone else suggested, lowering the IF would give you more \nbandwidth to play with.  Even better, some SDR designs also have the \nability to do undersampling, where a narrow (relatively) bandwidth \nthat is much above the sampling rate can be accurately sampled ( \nconceptually, it's like the sampling is also the first mixer).\n\nIt appears that the HPSDR hardware will be capable of undersampling, \npossibly into the UHF region.  I'm hoping to find out for myself \nlater this year when the Mercury and Penelope boards become available. :)\n\nWith the right SDR hardware and configuration, transverters may not \nbe needed until you go beyond 70cm.\n\n73 de VK3JED\nhttp://vkradio.com\n\n",
    "attachments": []
}