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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OMSCXKAYTUKFRP6WEHVSBPA4YFBZBG76/?format=api",
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    "message_id": "000501c78820$c386a260$347aca44@djxe18",
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    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/JYBQARFSNYM7QPN74V22FV2JGA62JEUH/?format=api",
    "sender": {
        "address": "rjansson (a) cfl.rr.com",
        "mailman_id": "9b211bcd8a0642788e6dc055f3930699",
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    "sender_name": "Dick Jansson-rr",
    "subject": "[eagle] Re: Another idea on phased array configuration",
    "date": "2007-04-26T16:34:29Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2NFUF6VF4LKC6LIEO54A2EEEJJKAPHAD/?format=api",
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    "content": "And thermally that all is pretty bad (being as civilized as I can say it)!\nWe cannot allow ourselves be sucked into such dreadful thermal situations.\n \nDick Jansson, KD1K\[email protected] \[email protected] \n---------------------------\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On Behalf Of\nLouis McFadin\nSent: Thursday, 26 April, 2007 1508\nTo: [email protected]\nCc: AMSAT Eagle\nSubject: [eagle] Re: Another idea on phased array configuration\n\n\nFor 43 of the Hittite devices it would take 132 w to deliver 43w of RF.\nThis doesn't count the circuitry needed to drive the finals or other\nspacecraft requirements. \nThis will also present a huge thermal problem with the need to dump around\n100w of heat on the top of the spacecraft.\nAt least 250w of solar capacity would be needed to support this based on\ncurrent requirements.\n\nOn Apr 26, 2007, at 1:08 AM, Tom Clark, K3IO wrote:\n\n\nBill Ress wrote: \n\nHi Tom, \n\nThanks for sharing your thoughts on the phased array approach. \n\nI especially appreciated your block diagrams which really helped. I'm\nsorting through the approach and will likely have some questions. \n\nRegarding amplifiers for 5.7 GHz, Sirenza has a 1/4 watt for $4.80. It draws\n165mA @ 5V or 7 amps for 43 of them. \n\nNow here's the real heartburn device. The Hittite HMC409LP4 (I think the one\nyou referred to) provides just over 1 watt, costs $8.52 (not bad at all) but\nruns 615mA at 5V - or  26 Amps for 43 antennas. If that input power doesn't\nbother anyone - there's part of our design! \n\nI've never heard any estimates of what DC power Eagle is planning to\ndeliver. Is that figure available yet? \n\nThanks again Tom for your time and thoughts. \n\nRegards...Bill - N6GHz \n\n\nBill -- it was the Hittite HMC408 that we looked at. We (N4HY, W3GPS & I)\ngot one of the HMC408 eval boards and tested it in Sep.'05. I presented a\nquick summary of our tests at the Eagle working group meeting in Pittsburgh\nin Oct.'05. I looked around for my PowerPoint presentation and found it; it\ncan be gleaned on my \"freebie\" website at\nhttp://mysite.verizon.net/w3iwi/HMC408.ppt. The presentation, as posted, has\none glaring error: the Hittite brick is missing from Slide #7. It's pretty\nobvious, bur it is a block between the DB6NT  upconverter and the -16 dB\ndirectional coupler. I never had a reason to re-present the talk, so I never\nbothered to fix the drawing.\n\nAnyway, the main conclusions from our \"quickie\" tests were\n\n\n1.\tIt worked as advertised in the data sheet (within ~ 1 dB which was\ncomparable to our measurement accuracy). \n\n2.\tWe concluded that we could affect you could optimize efficiency at\nany given power output level by tweaking Vctl. \n\n\n3.\tThe peak DC>RF efficiency we saw was ~ 22% for Vctl in the 3.5-4V\nrange and Vcc1=Vcc2=5V.\n\n\n4.\tThere is a possibility of doing even better by doing a more careful\noptimization of Vcc1 and Vctl. I suspect that Vcc2 needs to be the\nrecommended 5V. This is especially true if we are going to be able to use\nconstant envelope BPSK.  (i.e. something approaching Class-C). \n\n5.\tAny amplifier can be easily shut down by setting Vctl=0. \n\nLet's hope we can find a more efficient amplifier chip!\n\n73, Tom\n\n\n_______________________________________________\nVia the Eagle mailing list courtesy of AMSAT-NA\[email protected]\nhttp://amsat.org/mailman/listinfo/eagle\n\n\n\n\n",
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