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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RNYD7AZ47DJ6BBVJZVLJMTFE3D4JAK23/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "000201c6e29c$4359c510$0100a8c0@UPSTAIRS",
    "message_id_hash": "RNYD7AZ47DJ6BBVJZVLJMTFE3D4JAK23",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/VTD2WWIAMJ4ECZK5VES4S3GYO3AHJEEV/?format=api",
    "sender": {
        "address": "gmemory (a) compuserve.com",
        "mailman_id": "56285a27bde84732a3bf43d72bb13732",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/56285a27bde84732a3bf43d72bb13732/emails/?format=api"
    },
    "sender_name": "Gary Memory",
    "subject": "[amsat-bb] Re: 70cm preamp",
    "date": "2006-09-28T01:20:13Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VTD2WWIAMJ4ECZK5VES4S3GYO3AHJEEV/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FWY6Q4GBT6WKCDMG4POECS3NRIJR3GUF/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I'm sure there are other and perhaps better ways, but in my work (similar\nbut not FO29) I use a single cavity filter.  I had WAACOMM build one for me\nto my spec, but I note they are now out of business.  The can (for 2 meters)\nis about 8 inches in diameter and about 2.5 feet tall.  N connector in and a\nN connector out.  I can move my simplex frequency around about 20 - 30KHz\nbefore I need to retune the filter.\n\nYes, this is a brute force and expensive method, but by golly, it sure works\nwell for me.  This filter creates a nice, low noise-floor with just about\nany on-air transmitter in my shack.  I loved it so much; I bought another\n(smaller) filter for 440 as well.\n\nThere are other filters out there as well...but the method I've chosen works\nbest by far for me.\n\nFinally, I've found that for any one given situation, an attenuator is as\nuseful as a preamp.  It all depends on your total noise figure and link\nbudget.  Also, I feel antenna gain is \"more better\" than a pre or power amp.\n\nIn the end, it sounds like that unless you can add gain or a brute force\nfilter, reduced power in your nearby TX is possibly the only other method.\nBut then I'm sure others on this list will tell me I'm full of crap.\n\nGood luck es 73!!\n\nGary Memory, N7BRJ\n\n\n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of Bill Bruno\nSent: Wednesday, September 27, 2006 7:04 PM\nTo: Amsat BB\nSubject: [amsat-bb] 70cm preamp\n\n \nOn my V/U setup I have a SP7000 70cm preamp. Working FO29(JAS2) my 2 meter \nsignal overloads the preamp, my signal splattering like an adjacent strong \nstation. With preamp off the problem is not there. In testing I found the \noverload happens in any combination of 70cm 2m frequency pairs. I can \neliminate the problem by lowering the tx power, but by doing so I have a \nhard time copying my own signal. How can I eliminate the 2m sig overloading \nthe preamp while still maintaining  adequate power?\nAntennas m2 436cp30,  Gulf Alpha 2m5el, both right hand polarization.\nI could use some suggestions.\nThanks Bill \n\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\n\n\n",
    "attachments": []
}