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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HQSOX5476PZWHETDNKR5FELKTQ2DEL7E/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "HQSOX5476PZWHETDNKR5FELKTQ2DEL7E",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/3JOC5BSPZHAEOGASR7G2J7F5K4N3VBBX/?format=api",
    "sender": {
        "address": "grant (a) ghengineering.co.uk",
        "mailman_id": "74a4d29508634e669020884f51007f55",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/74a4d29508634e669020884f51007f55/emails/?format=api"
    },
    "sender_name": "Grant Hodgson",
    "subject": "[amsat-bb] Re: Full band transverters for satellite  operations?",
    "date": "2007-06-14T21:26:47Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5QQFIG5GZL5QE7RIQTY6ZXXL37NTWGK4/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JRQD7X77WRZA65LMJGKRDNZXAUD2LFML/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "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\nThere might be a cut-down, 2.4GHz-only version, but the only cost \nsavings would be the TX power amplifier (100mW-200mW o/p) on the RF \nboard and maybe the TX D/A converter on the baseband board, which is \nonly a few dollars and might be offset by the fact that it would be a \ndifferent build.  If there is a lot of demand we'll look into the \npossibility of it but I don't think the cost savings will be significant.\n\nI should point out that the VK\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\nThe 2.3-2.4GHz amateur band is the most fragmented band that we have; \nthere are at least 6 regional variants that I'm aware of.  One of the \ngoals is that we want to cover the whole 2.3-2.45GHz band, and we now \nhave a paper design that will do just that without compromising key \nparameters such as out-of-band filtering etc.  I'm not aware of any \nother 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\nI believe that the transmission of the digitised audio has already been \nsuccessfully demonstrated over Ethernet using UDP.  The use of Ethernet \nallows for long cable runs enabling the uWSDR to be mounted at the \nmasthead and just running power and CAT5 cable into the shack.  No need \nfor lengthy runs of coax.\n\nAll other SDRs I've seen use a soundcard(ish),\n> USB2 or Firewire interface.\n> \nThe uWSDR approach is similar to that of the HPSDR, i.e. we have \ndesigned our own sound card, and after some considerable work we have \nopted for the same very high performance D/A converter that the HPSDR \nuses.  This way we have absolute control of all the key parameters, and \nit's also cheaper than buying a Delta-44.\n\nregards\n\nGrant\n> \n\n",
    "attachments": []
}