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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FZZAIDBO5ESYPVN4IJWWUWAWVEQSNAMB/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "FZZAIDBO5ESYPVN4IJWWUWAWVEQSNAMB",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FZZAIDBO5ESYPVN4IJWWUWAWVEQSNAMB/",
    "sender": {
        "address": "jbrandenburg (a) amsat.org",
        "mailman_id": "fba29bb05aa944e3b759fb437017d01e",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/fba29bb05aa944e3b759fb437017d01e/emails/"
    },
    "sender_name": "Jonathan Brandenburg",
    "subject": "[pacsat-dev] RF Components / Power Requirements",
    "date": "2023-05-05T16:55:06Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "As discussed last night, I've completed some preliminary work on the \nradiation tolerant circuitry. That does bring up one question...\n\nBob, do you already have circuitry for watchdog protection and current \nlimiting in the schematic / on the board? Or does that still have to be \nshoehorned into the board?\n\n\nTo refine the design I've prototyped, I need to know the \nanticipated/budgeted power requirements. The part I'm looking at for \ncurrent limiting, MAX4995AAUT+T, can handle 600mA. If we derate that a \nbit (are we using 50%?) we can handle 300mA. That's quite a lot so I \ndon't expect an issue with hitting max current except possibly the power \namplifier and it's not clear to me if the power amplifier needs to be \nprotected against latchup anyway. In our previous designs, we have a \nseparate current limiter for each AX5043, the power amplifier, and the \nTMS570. (I think the LNAs are bundled with the AX5043 for the purposes \nof power limits and peripheral power requirements for TXCOs and such ). \nI don't think we'll need that many here but we'll probably need one for \neach voltage rail.\n\n\nDo we have answers to some of the following questions or is some of \nstill being determined:\n\n1. What power output level are we using on the AX5043? Max current at \n16dbm TX is 48 mA plus 6.5 mA for VHF receiver or 9.5 mA for UHF receive.\n\n2. What LNAs are we using? Does each AX5043 have its own LNA? (I haven't \nlooked for a schematic so tell me to go find it myself if it's in Github.)\n\n3. What power amplifier are we using and what is the power output? (I \nstill need to double-check a need for current limiter here.)\n\n4. Do we have a characterization for the TMS570 configuration to know \nwhich subsystems will be active and thus have a power budget for the TMS570?\n\nThanks a lot!\n\nJonathan\n\n-- \nJonathan Brandenburg, KF5IDY\n\n",
    "attachments": []
}