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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LYXSTY3XE773GNSZFSTV7KHXDE52H3FF/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "LYXSTY3XE773GNSZFSTV7KHXDE52H3FF",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/NU3VDT2E4JEBOBFBYF3H6JBURDDQJJ7K/?format=api",
    "sender": {
        "address": "matt (a) ettus.com",
        "mailman_id": "fcfbe2ace2e140b5be16e4b6f8dcea6b",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/fcfbe2ace2e140b5be16e4b6f8dcea6b/emails/?format=api"
    },
    "sender_name": "Matt Ettus",
    "subject": "[eagle] Re: BGA Tools",
    "date": "2007-01-16T02:37:44Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IKYNMGHSYKKIEIQCKIXMGGMXC2ASQHWW/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VAMRCJSJIDSFUVF2SRBUJK2KS7UJMVEH/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Lyle Johnson wrote:\n>> Besides, I wouldn't send out a single BGA-containing board to my\n>> TERRESTRIAL customers without having it X-Ray scanned first to check the\n>> connections.  I certainly wouldn't send one into space without a\n>> scan. Are you planning on purchasing an XRay machine as well?\n>\n> No, no plans on an X-ray machine, Matt.    High-volume manufacturers\n> of boards with BGAs dont; X-Raythem either.\n\nNot true at all.  EVERY SINGLE board with a BGA on it from ANY of the\ncontract manufacturers I use is XRayed.  Even the bargain-basement guys\nwho I wouldn't trust with a valuable BGA do it.  It isn't even\noptional.  You don't have to request it, you don't have to pay extra for\nit, they automatically XRay EVERY SINGLE BGA board, no matter what.  The\ncost is negligible.\n\n> Once you get the thermal profiles worked out, it makes reliable\n> connections.\n>\n> The equipment comes with a test board for 4 positions, and 4 BGA\n> devices that contain a pattern of jumpers so that you can determine\n> when it is in fact properly soldered down.  This helps to calibrate\n> the thermal profiles.\n\nThere is a very big difference between making electrical contact and\nmaking a good solid physical joint.  And calibration means that most\nchips will be properly placed the first time.  It doesn't mean ALL will\nbe placed properly.\n\n>\n> This is the same machine JPL used to place the BGAs in the Spirit and\n> Opportunity rovers.  Not sure if they X-rayed these or not, but it is\n> the same exact placement tool set.  In fact, Zephyrtronics includes a\n> NASA report on how to use the machine for reliable placements.\n\nI'd bet my life that JPL XRayed them.  In fact, I'd bet they XRayed them\nseveral times -- once after assembly, once after thermal vac tests, once\nafter a shake test, and then once again for good measure.\n\nTo repeat, I wouldn't send a single BGA-containing board out to a\ncustomer without an XRay, and the only risk to me would be roundtrip UPS\ncharges.\n\nI know you've sent a lot more satellites into orbit than I have, so you\nhave a lot of experience with this.  But I have to say that anybody\nsending a BGA into space without XRaying it first is absolutely nuts.  I\ndon't care if Werner von Braun himself said otherwise.\n\nMatt\n\n",
    "attachments": []
}