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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6KK5QS47DMZACB3FQOMOH3BJRPFRILZW/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "003f01c70a12$6b129ee0$72b7b546@kc6uqh",
    "message_id_hash": "6KK5QS47DMZACB3FQOMOH3BJRPFRILZW",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/7JKIE6PI6HKGPHKRGJCLMQTE4ZWYLCW3/?format=api",
    "sender": {
        "address": "kc6uqh (a) cox.net",
        "mailman_id": "d9201820d18047e4a2772c86bda5e111",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d9201820d18047e4a2772c86bda5e111/emails/?format=api"
    },
    "sender_name": "kc6uqh",
    "subject": "[amsat-bb] Re: Help with crystal filter",
    "date": "2006-11-17T06:34:22Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7JKIE6PI6HKGPHKRGJCLMQTE4ZWYLCW3/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/W2AERJX6GGFIWFGAX6NYFHWLGKXMOUPO/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "William,\nSuggest a FET follower, dual gate type, and a resistive 5 k load.\nArt, KC6UQH\n----- Original Message ----- \nFrom: \"William Leijenaar\" <[email protected]>\nTo: <[email protected]>\nSent: Thursday, November 16, 2006 12:13 AM\nSubject: [amsat-bb] Help with crystal filter\n\n\n> Hi AMSATs,\n>\n> For a (small) transponder design I am checking\n> different kinds of filters. I need something small and\n> cheap, and I tested some of the monolitical 10M30A\n> crystal filters.\n>\n> The problem is that I can not get the ripple less than\n> 2dB, where the specs say 0.5dB. I can see the 2 poles\n> with a kind of bath-tube in the middle. I think the\n> problem is the matching of the 5000 ohm impedance in\n> the specs.\n>\n> In my design I used small 5mm transformers, that\n> doesn't work at all. More tests with a \"pigs nose\"\n> transformers work better, only not better than 2dB\n> ripple.\n>\n> Maybe someone has experience with these monolitical\n> crystal filters (especially the wideband 10M30A) ??\n> I wonder how sensitive these filters are to an\n> impedance miss-match, and how to get the optimum out\n> of these filters ??\n>\n> Specs can E.g be found here:\n> http://www.icmfg.com/107mhzfilters.html\n>\n> 73 de PE1RAH\n> William Leijenaar\n> ---\n>\n>\n>\n> ____________________________________________________________________________________\n> Sponsored Link\n>\n> Mortgage rates near 39yr lows.\n> $510k for $1,698/mo. Calculate new payment!\n> www.LowerMyBills.com/lre\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n> \n\n\n",
    "attachments": []
}