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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7HLO66D4BNLCW2NOBGCXAMVQAFCRWCGU/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "769799070.67341.1273063131469.JavaMail.root@cl01-host01.roch.ny.frontiernet.net",
    "message_id_hash": "7HLO66D4BNLCW2NOBGCXAMVQAFCRWCGU",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/APKA7V3N5BV2KSCXYUD5IT3YCUUFEMWB/",
    "sender": {
        "address": "aflowers (a) frontiernet.net",
        "mailman_id": "9d61d6d625404d38a4a8e8c881053869",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/9d61d6d625404d38a4a8e8c881053869/emails/"
    },
    "sender_name": "[email protected]",
    "subject": "[amsat-bb] Re: mmds downconverters for ao-51?",
    "date": "2010-05-05T12:38:51Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WE5JSICYCMYA46BFQGDAA7IATU6TBXAB/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I have one of these all-in-one units on my shelf here.  The filter construction is *not* identical to the Cal-amp models, but you can use the same roadmap as in my article to figure out what is what.  It will be a little trickier to get to work reasonably at 2401.  This is because the input filter is a metal-ceramic (probably helical?) no-tune component that is soldered and glued to the board.  The frequency range 2300-2700 MHz really depends on what it was designed for--some of the I understand some of the Austrailian models work at 2401 right out of the box, but the one I have (designed for MMDS service in the US) is probably 20-30dB down from its peak around 2500 MHz.  The front end filter appears to be the bottleneck.  Like other MMDS converters in the US, this one has a 2278MHz LO that gives you a 123 MHz IF for 2401.\n\nReplacing that filter looks to be a bear, though it might be possible.  If anyone has figured out how to do this without destroying the thin PC board, there would be many people interested.  I imagine it would work acceptably for AO-51 if you just bypassed the font-end filter, but if you have any PCS stuff in the 2.1 GHz range you might have issues from the image frequency.  I did that for my first S-band contacts with a Pacific Monolithics MMDS converter, using a horn antenna fashioned out of a large soup can it it worked fine from downtown Rochester, NY.\n\nAndy K0SM/2\n\n----- Original Message -----\nFrom: \"Michael Heim, KD0AR\" <[email protected]>\nTo: [email protected]\nSent: Wednesday, May 5, 2010 7:36:51 AM\nSubject: [amsat-bb] Re: mmds downconverters for ao-51?\n\nYou will be astounded with the signal you will get from one of these downconverters.  I used this modification:\nhttp://www.rvhfg.org/articles/k0sm/basic%20mods.php\n\n\n \n\n________________________________\nMichael Heim\nChief Engineer, Forever Broadcasting\nNew Castle PA\nWKST  WJST  WWGY\n814-671-0666\nContract Engineer  \nCell: 330-502-6379\nARS KD0AR\n\n________________________________\n\n\n\n\n\n________________________________\nFrom: \"Gary \"Joe\" Mayfield\" <[email protected]>\nTo: [email protected]\nSent: Wed, May 5, 2010 7:24:15 AM\nSubject: [amsat-bb] Re: mmds downconverters for ao-51?\n\nWow, the famous 'cigar' antenna.  At that price you can afford to play with\nit.\n\n73,\nJoe kk0sd\n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of [email protected]\nSent: Tuesday, May 04, 2010 4:38 PM\nTo: [email protected]\nSubject: [amsat-bb] mmds downconverters for ao-51?\n\nHas anyone tried one of the itfs mmds downconverters like this\none on ebay:\n\n\nhttp://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110523087399&ssPageName=S\nTRK:MEWNX:IT\n\nfor ao-51 s band downlink? 75 ohm out and looks cheesey but\nless than $30 shipped. it's cheap enough for me to play so I\nbought one to experiment with, maybe just to remove the\ndownconverter. I would welcome stories of your experience or\njust advice.\nThanks\nJohn, kn4ge\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n",
    "attachments": []
}