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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HRCDSMNNLMPK2P2DBEKUQ4PLH4GW6CUV/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CABNc=0T+VthQW-Py2uevYMAxq-UYso91vwycjx+BO3r6CJ9EJQ@mail.gmail.com",
    "message_id_hash": "HRCDSMNNLMPK2P2DBEKUQ4PLH4GW6CUV",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/LDZFP26OAXZAB6QVDQN7TSAK4QDHGN2X/",
    "sender": {
        "address": "dan.habecker (a) gmail.com",
        "mailman_id": "ff1212c63cab4a29a387c024d8751bfa",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/ff1212c63cab4a29a387c024d8751bfa/emails/"
    },
    "sender_name": "Dan Habecker",
    "subject": "Re: [LTM] Power",
    "date": "2020-06-17T01:37:36Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZO45A4B7J6QR7UNQ4EBRC6VFAHB7HJHP/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2RMPFEMIYCPDEHQ6FNXLFLIEQ7HXDNYN/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I have at least one preliminary number for power consumption.  I have the\nPA, drivers, and DC-DC part of the APT circuit running now.  I can get\nabout 2W (with two 1W signals) average power out of it.  It draws about 6W\nto do this and does get a bit warm.  This is for running at that power\ncontinuously.\n\n73,\nDan W9EQ\n\nOn Tue, Jun 16, 2020 at 1:49 PM Marc Franco via LTM <[email protected]> wrote:\n\n> I couldn’t agree more, John.\n>\n> 73, Marc N2UO\n>\n>\n>\n> On Jun 16, 2020, at 1:21 PM, John Klingelhoeffer via LTM <[email protected]>\n> 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\n> more) , now you're talking.\n>\n> Yes, it could probably fit on the QSH/QTH stack, though.  Heat dissipation\n> *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>\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> 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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