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/ZO45A4B7J6QR7UNQ4EBRC6VFAHB7HJHP/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "ZO45A4B7J6QR7UNQ4EBRC6VFAHB7HJHP",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/LDZFP26OAXZAB6QVDQN7TSAK4QDHGN2X/",
    "sender": {
        "address": "lu6dw (a) yahoo.com",
        "mailman_id": "38581a10f76f46638a4ef3f2cf221b54",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/38581a10f76f46638a4ef3f2cf221b54/emails/"
    },
    "sender_name": "Marc Franco",
    "subject": "Re: [LTM] Power",
    "date": "2020-06-16T17:40:04Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BQWW34U3CVQJRG5JU3PJ4ZHD2FNBFL56/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HRCDSMNNLMPK2P2DBEKUQ4PLH4GW6CUV/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I couldn’t agree more, John.\n\n73, Marc N2UO\n\n\n\n> On Jun 16, 2020, at 1:21 PM, John Klingelhoeffer via LTM <[email protected]> wrote:\n> \n> \n> Yeah, it really isn't worth the effort for 2 or 3 dB more.  \n> \n> If one had the power and heat dissipation capability for +40 dBm (10 dB more) , now you're talking.  \n> \n> Yes, it could probably fit on the QSH/QTH stack, though.  Heat dissipation would be an issue. \n> \n> 73\n> \n> John...\n> WB4LNM\n> \n> \n>> On Mon, Jun 15, 2020 at 11:04 PM Eric Skoog via LTM <[email protected]> wrote:\n>> The latest version of the LTM's RX/TX card that Dan is finishing up has two RF output power levels:  500 mW and 1W.  When he's through testing, I've asked Dan to provide me with the DC power consumption numbers for all the possible modes (TLM only, Transponder Only, TLM + Transponder ----- for High and Low power settings).  We know Linear Amplifiers are NOT very power efficient.  So I'm expecting this high power mode will require in excess of 3W DC..............we'll see.\n>> \n>> As for adding an external amplifier to the 'stack', as JK asked, what is the final RF power level desired? Config-wise one could certainly connect the existing TX coax from the RX/TX card to a stack-mounted amplifier card and control it via QTH/QSH bus signals.  But the design requirements would have to be specified and there would be several design challenges and trade-offs.  I mentioned DC power consumption for low efficiency linear PAs.  Beyond that I would be concerned about RFI effects on other cards in the stack, particularly experiments.  Also, heat dissipation is a real challenge were the requirement to be several watts of RF, i.e., thermal issues. Lastly, I'd be concerned re meeting IM levels, i.e., spectral purity requirements from the ITU regulations. \n>> \n>> eric\n>> \n>>> On Mon, Jun 15, 2020 at 4:32 PM Jerry Buxton via LTM <[email protected]> wrote:\n>>> Quick question, what is the max power out can we get from LTM-1 and is\n>>> there a possibility of adding an \"external amplifier\" to the stack? \n>>> e.g. fits on QTH/QSH bus maybe and input is just the output of the\n>>> transponder, picture your rig and the amp in your shack.  No power\n>>> supply considerations, just raw what if for the transponder.  Thanks!\n>>> \n>>> -- \n>>> Jerry Buxton, NØJY\n>>> Vice President - Engineering\n>>> Radio Amateur Satellite Corp.\n>>> (AMSAT)\n>>> \n>>> _______________________________________________\n>>> LTM mailing list\n>>> [email protected]\n>>> https://www.amsat.org/mailman/listinfo/ltm\n>> _______________________________________________\n>> LTM mailing list\n>> [email protected]\n>> https://www.amsat.org/mailman/listinfo/ltm\n> _______________________________________________\n> LTM mailing list\n> [email protected]\n> https://www.amsat.org/mailman/listinfo/ltm\n\n\n",
    "attachments": [
        {
            "email": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZO45A4B7J6QR7UNQ4EBRC6VFAHB7HJHP/",
            "counter": 2,
            "name": "attachment.html",
            "content_type": "text/html",
            "encoding": "utf-8",
            "size": 5203,
            "download": "https://mailman.amsat.org/hyperkitty/list/[email protected]/message/ZO45A4B7J6QR7UNQ4EBRC6VFAHB7HJHP/attachment/2/attachment.html"
        }
    ]
}