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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/QKIVGYBIXZIVSCNUT64Y7EFAXEW5NVJL/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "QKIVGYBIXZIVSCNUT64Y7EFAXEW5NVJL",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YRNHTSAJJE32E36EMBTPQQHO5QYLXPM4/?format=api",
    "sender": {
        "address": "tosca005 (a) umn.edu",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "[email protected]",
    "subject": "[amsat-bb] Re: Yaesu 847 power supply -linear vs. switching",
    "date": "2011-02-18T22:35:34Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YRNHTSAJJE32E36EMBTPQQHO5QYLXPM4/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "On Feb 18 2011, zach hillerson wrote:\n\n I purchased a Yaesu 847 for both satellite and HF work.  Since this is my \n1st base-style transceiver I am now in need of a power supply.  I was \noriginally considering the Astron RS35M and am curious if linear or  \nswitching is the proper choice?  Is there a Amsat BB favorite between \nswitching and linear? \n>\n>Thanks for any help!\n>\n>Zach\n>N4ERZ\n\nZach:\n\nI've had my FT-847 for many years, and have used it both for satellites and \nVHF/UHF terrestrial work. (Very little HF, but some).\n\nIt has never \"complained\" about any properly working power supply it's been \nhooked to. These include an Astron 20 amp linear PS, an Astron 60 amp \nlinear, an Astron 35 amp switcher, car battery plus vehicle alternator, and \nothers when I've brought it out to Field day. Runs perfectly with any of \nthem.\n\nIn general, more power is better, because these amp suckers seem to \nmultiply. My first PS, the 20 amp linear, worked fine with the FT-847, but \nwhen I added a linear amplifier for the 144-148 MHz band, the combined draw \nwas too much. I've NEVER managed to draw more power than the 60 amp linear \ncan provide, but it is an enormous pain (literally and figuratively) to \npull it off its usual resting place in the shack and carry it up two \nflights of stairs to load into my SUV to haul out to Field Day. The 35 amp \nswitcher has done a fine job for me, and the difference in weight is \nincredible, at least to a rickety old guy with worn out knees, like yours \ntruly.\n\nIn fact, my FT-847 has NEVER refused to work for me, except for the time I \nset it up in a tent trailer for Field Day on a Friday afternoon, and a big \nwind storm came through overnight. When I arrived Saturday morning to \ncomplete final setup and get ready to operate, I found that the tent \ntrailer was lying on its roof, with the FT-847's face planted in the ground \nand its back panel holding up one end of the tent trailer. At that point, \nthe big knob on the front would not turn, but who could blame it? And best \nof all, the repairs cost $0.00! After Field Day was over, I brought it \nhome, started a careful disassembly of the front panel, and discovered that \nthe reason that the tuning knob wouldn't turn was because the steel \nsub-chassis onto which it was bolted had bent from the weight of the \ntrailer on top of the radio. Some carefully-placed whacks with a big hammer \nfixed that. Put it back together and it's worked like a champ ever since. \n(I also used some toothpaste to polish up the scratches on the front face \nof the tuning knob, and you'd never know it had been treated so cruelly!)\n\nIn short, the 35 amp Astron (either linear or switching) will be plenty \nstrong enough and reliable enough to power an FT-847 and a typical VHF/UHF \namplifier, with power left over to run more small station equipment.\n\n73 de W0JT\n\n\n",
    "attachments": []
}