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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XTQMGBLNZOSIMO7KOVGOCB6FVL4IWQQJ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "XTQMGBLNZOSIMO7KOVGOCB6FVL4IWQQJ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/7JKIE6PI6HKGPHKRGJCLMQTE4ZWYLCW3/?format=api",
    "sender": {
        "address": "JamesDuffey (a) comcast.net",
        "mailman_id": "16d2718d7d4a47dca8f564d867aacfe2",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/16d2718d7d4a47dca8f564d867aacfe2/emails/?format=api"
    },
    "sender_name": "James Duffey",
    "subject": "[amsat-bb] Re: Help with crystal filter",
    "date": "2006-11-17T01:19:54Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7JKIE6PI6HKGPHKRGJCLMQTE4ZWYLCW3/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
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        "status": "neutral"
    },
    "content": "William - I have not used these filters, but you may want to contact  \nICM directly for help. I think many of the engineers there are hams and  \nyou may be able to get some help by sending an e-mail to them.\n\nYou might also try matching into the ends with a L or pi network. Also,  \nmeasuring the response with a 5kOhm resistor termination should tell  \nyou whether or not the problem is improper termination. - Duffey\nOn Nov 16, 2006, at 1:13 AM, William Leijenaar wrote:\n\nHi AMSATs,\n\nFor a (small) transponder design I am checking\ndifferent kinds of filters. I need something small and\ncheap, and I tested some of the monolitical 10M30A\ncrystal filters.\n\nThe problem is that I can not get the ripple less than\n2dB, where the specs say 0.5dB. I can see the 2 poles\nwith a kind of bath-tube in the middle. I think the\nproblem is the matching of the 5000 ohm impedance in\nthe specs.\n\nIn my design I used small 5mm transformers, that\ndoesn't work at all. More tests with a \"pigs nose\"\ntransformers work better, only not better than 2dB\nripple.\n\nMaybe someone has experience with these monolitical\ncrystal filters (especially the wideband 10M30A) ??\nI wonder how sensitive these filters are to an\nimpedance miss-match, and how to get the optimum out\nof these filters ??\n\nSpecs can E.g be found here:\nhttp://www.icmfg.com/107mhzfilters.html\n\n73 de PE1RAH\nWilliam Leijenaar\n---\n\n\n\n________________________________________________________________________ \n____________\nSponsored Link\n\nMortgage rates near 39yr lows.\n$510k for $1,698/mo. Calculate new payment!\nwww.LowerMyBills.com/lre\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite  \nprogram!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n\n--\nJames Duffey KK6MC/5\nCedar Crest NM 87008\nDM65\n\n",
    "attachments": []
}