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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BQWW34U3CVQJRG5JU3PJ4ZHD2FNBFL56/",
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    "message_id": "CACXbQSRMNW8ud2CGKHBN09KJz2tVHmcJktQe-5d5-bw3hGfH4w@mail.gmail.com",
    "message_id_hash": "BQWW34U3CVQJRG5JU3PJ4ZHD2FNBFL56",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/LDZFP26OAXZAB6QVDQN7TSAK4QDHGN2X/",
    "sender": {
        "address": "wb4lnm (a) gmail.com",
        "mailman_id": "e19795499ef44abd8de18cc45646c64d",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/e19795499ef44abd8de18cc45646c64d/emails/"
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    "sender_name": "John Klingelhoeffer",
    "subject": "Re: [LTM] Power",
    "date": "2020-06-16T16:48:14Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/E3YOTIIKBFAWBFQHENJSK66IPF5FF2XS/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZO45A4B7J6QR7UNQ4EBRC6VFAHB7HJHP/"
    ],
    "votes": {
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        "dislikes": 0,
        "status": "neutral"
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    "content": "Yeah, it really isn't worth the effort for 2 or 3 dB more.\n\nIf one had the power and heat dissipation capability for +40 dBm (10 dB\nmore) , now you're talking.\n\nYes, it could probably fit on the QSH/QTH stack, though.  Heat dissipation\n*would* be an issue.\n\n73\n\nJohn...\nWB4LNM\n\n\nOn Mon, Jun 15, 2020 at 11:04 PM Eric Skoog via LTM <[email protected]> wrote:\n\n> The latest version of the LTM's RX/TX card that Dan is finishing up has\n> two RF output power levels:  500 mW and 1W.  When he's through testing,\n> I've asked Dan to provide me with the DC power consumption numbers for all\n> the possible modes (TLM only, Transponder Only, TLM + Transponder ----- for\n> High and Low power settings).  We know Linear Amplifiers are NOT very power\n> efficient.  So I'm expecting this high power mode will require in excess of\n> 3W DC..............we'll see.\n>\n> As for adding an external amplifier to the 'stack', as JK asked, what is\n> the final RF power level desired? Config-wise one could certainly connect\n> the existing TX coax from the RX/TX card to a stack-mounted amplifier card\n> and control it via QTH/QSH bus signals.  But the design requirements would\n> have to be specified and there would be several design challenges and\n> trade-offs.  I mentioned DC power consumption for low efficiency linear\n> PAs.  Beyond that I would be concerned about RFI effects on other cards in\n> the stack, particularly experiments.  Also, heat dissipation is a real\n> challenge were the requirement to be several watts of RF, i.e., thermal\n> issues. Lastly, I'd be concerned re meeting IM levels, i.e., spectral\n> 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]>\n> wrote:\n>\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> _______________________________________________\n> LTM mailing list\n> [email protected]\n> https://www.amsat.org/mailman/listinfo/ltm\n>\n\n\n",
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