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/2RMPFEMIYCPDEHQ6FNXLFLIEQ7HXDNYN/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CACXbQSTrcuFWSJVHex0cRzPU82iXG8o_=wFgnCvWGnJjw0iYuw@mail.gmail.com",
    "message_id_hash": "2RMPFEMIYCPDEHQ6FNXLFLIEQ7HXDNYN",
    "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/"
    },
    "sender_name": "John Klingelhoeffer",
    "subject": "Re: [LTM] Power",
    "date": "2020-06-18T14:35:23Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HRCDSMNNLMPK2P2DBEKUQ4PLH4GW6CUV/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "So, what's the continuing discussion / question, boss?  Where do we go from\nhere?  The question was kina open ended without a discussion of a\nparticular mission / bus.\n\n73\n\nJohn...\nWB4LNM\n\n\n\nOn Tue, Jun 16, 2020 at 8:37 PM Dan Habecker <[email protected]> wrote:\n\n> I have at least one preliminary number for power consumption.  I have the\n> PA, drivers, and DC-DC part of the APT circuit running now.  I can get\n> about 2W (with two 1W signals) average power out of it.  It draws about 6W\n> to do this and does get a bit warm.  This is for running at that power\n> continuously.\n>\n> 73,\n> Dan W9EQ\n>\n> On 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\n>> 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]>\n>> 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\n",
    "attachments": [
        {
            "email": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2RMPFEMIYCPDEHQ6FNXLFLIEQ7HXDNYN/",
            "counter": 2,
            "name": "attachment.html",
            "content_type": "text/html",
            "encoding": "utf-8",
            "size": 7729,
            "download": "https://mailman.amsat.org/hyperkitty/list/[email protected]/message/2RMPFEMIYCPDEHQ6FNXLFLIEQ7HXDNYN/attachment/2/attachment.html"
        }
    ]
}