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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/QSR2MBAC3K4WAG3PY3KSQYTRHJHJQXZF/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "QSR2MBAC3K4WAG3PY3KSQYTRHJHJQXZF",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/QSR2MBAC3K4WAG3PY3KSQYTRHJHJQXZF/",
    "sender": {
        "address": "wa4cwi (a) bellsouth.net",
        "mailman_id": "4aa6f1e3f4cd4bf4b1492e47285ca527",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/4aa6f1e3f4cd4bf4b1492e47285ca527/emails/"
    },
    "sender_name": "Jim McCullers",
    "subject": "[pacsat-dev] Re: PacSatSW - Transmitter Power Level",
    "date": "2024-02-21T02:46:47Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Bob,\n\n \n\nI'll look further.\n\nThanks?\n\n \n\nTake all the time you need and don't want to sort out the board to the max\nbefore sending it on!\n\n \n\nJim\n\n \n\n \n\nJim, There is another place you may be missing and I will have to find it\nlater and let you know. But the code does this by calling a SPI write\nroutine to the AX device and in this routine the value is truncated down to\n0xff.  However when I tested other values like 0xe0 the thing just stopped\ntransmitting.\n\n \n\nI can copy the signal in my lab with 0x0d. Maybe it is increasing power\nsomeplace else but I hope not so we can get some more bang.\n\n \n\nI plane to ship you a board tomorrow. I thought I was going to get it out\ntoday but I kept finding issues on the board I had to fix. This board still\nhas a bit of week power source. The 5V supply is running about 4.75 and the\n3.3 is a little low like 3.25. May need the additional headroom from 5V.\nThere is a resistor string on the back of the board that programs the level.\n\n\n \n\nI noticed today that the board did not come up when I powered it and then I\nremoved power and reconnected and that time it worked fine.\n\n \n\n \n\nThe board needs a bit more voltage feeding the preamp on the RX input to get\nmore gain. It is operating with 30 mA and would like to have 60 mA to have\nfull gain. The 3.3V minder chip I thought was set for enough current to feed\neverything but may need to move the monitor resistor up to allow a full 600\nmA.\n\n \n\nI did not see these issues on a board I just sent to Chris.\n\n \n\nI am ready to share the fun though and instead of continuing to debug and\nchase problems I am going to send you a setup tomorrow. I may poke at it a\nlittle in the morning but not much.\n\n \n\nAt this point when the board powers up it does transmit and it will receive\nor at least it will get the rf to the AX5043 inputs. I can see it there.\n\n \n\nYour call is programmed into the flash so play with it until you get a\nprogrammer.\n\n \n\nI will send you a programmer later. Burns is sending me two and soon as I\nsee them and add a connector I will push one on to you.\n\n \n\nBob\n\n  _____  \n\nFrom: Jim McCullers via pacsat-dev <[email protected]\n<mailto:[email protected]> >\nSent: Tuesday, February 20, 2024 8:24 PM\nTo: 'Pacsat Dev' <[email protected] <mailto:[email protected]> >\nSubject: [pacsat-dev] PacSatSW - Transmitter Power Level \n\n \n\nBob,\n\n \n\nLooking at the lastest code I see two places, which is one to many, where\nthe transmit power level is set.\n\nThey are:\n\n \n\nax5043-ax25.c            Lines 435-436\n\n \n\nTxTask.c                     Line 63                        calls\nradio_set_power() at line 112\n\n \n\nThey both set the power level to 0x0020 which is very weak.\n\n \n\nI don't see a place that sets the transmit level to 0x0d.\n\nLet me know where you found that reference.\n\n \n\nI would suggest setting both places to 0x0FFF for maximum output (+15 dbm)\n\n \n\nJim McCullers\n\nWA4CWI\n\n \n\n \n\n\n\n",
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