Email Detail

HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JRQD7X77WRZA65LMJGKRDNZXAUD2LFML/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "JRQD7X77WRZA65LMJGKRDNZXAUD2LFML",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/3JOC5BSPZHAEOGASR7G2J7F5K4N3VBBX/?format=api",
    "sender": {
        "address": "mat_62 (a) netcommander.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Michael Tondee",
    "subject": "[amsat-bb] Re: Full band transverters for satellite  operations?",
    "date": "2007-06-15T02:24:38Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HQSOX5476PZWHETDNKR5FELKTQ2DEL7E/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZFZ5CWQW3QMMSMWKM34RTLZGVMR5COQH/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "    I find myself kind of curious on the question of whether this will \nbe a more or less economical way of satellite ops than a traditional \nsatellite radio? For the moment I had to sell my gear and will be \nlooking to dive back in about the time the HEO birds launch. I still \nhave my computer, of course, and would love to go the SDR route when I \nset up again if it's economically feasible for me.\n73,\nMichael, W4HIJ\nGrant Hodgson wrote:\n> Tony Langdon wrote:\n>   \n>> Neat.  Hopefully I can look at getting the uWSDR going once I get my \n>> HPSDR up and running.  Just a comment.  Firstly, I notice there are \n>> plans for Rx only on 2400 MHz.  \n>>     \n>\n> There might be a cut-down, 2.4GHz-only version, but the only cost \n> savings would be the TX power amplifier (100mW-200mW o/p) on the RF \n> board and maybe the TX D/A converter on the baseband board, which is \n> only a few dollars and might be offset by the fact that it would be a \n> different build.  If there is a lot of demand we'll look into the \n> possibility of it but I don't think the cost savings will be significant.\n>\n> I should point out that the VK\n>   \n>> terrestrial weak signal segment is 2403 MHz, so if I was to obtain a \n>> 13cm module, I would want Tx and RX on the 2400-2404 MHz segment (Rx for \n>> 2401, Tx/Rx for 2403).\n>>     \n>\n> The 2.3-2.4GHz amateur band is the most fragmented band that we have; \n> there are at least 6 regional variants that I'm aware of.  One of the \n> goals is that we want to cover the whole 2.3-2.45GHz band, and we now \n> have a paper design that will do just that without compromising key \n> parameters such as out-of-band filtering etc.  I'm not aware of any \n> other amateur radio product that will cover the whole 150MHz at 13cms.\n>   \n>> I'm also interested how the Ethernet and UDP/IP interface and \n>> communications goes.  \n>>     \n>\n> I believe that the transmission of the digitised audio has already been \n> successfully demonstrated over Ethernet using UDP.  The use of Ethernet \n> allows for long cable runs enabling the uWSDR to be mounted at the \n> masthead and just running power and CAT5 cable into the shack.  No need \n> for lengthy runs of coax.\n>\n> All other SDRs I've seen use a soundcard(ish),\n>   \n>> USB2 or Firewire interface.\n>>\n>>     \n> The uWSDR approach is similar to that of the HPSDR, i.e. we have \n> designed our own sound card, and after some considerable work we have \n> opted for the same very high performance D/A converter that the HPSDR \n> uses.  This way we have absolute control of all the key parameters, and \n> it's also cheaper than buying a Delta-44.\n>\n> regards\n>\n> Grant\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>\n>   \n\n",
    "attachments": []
}