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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6SOGH6UHO3CW44DIPLE3GSQ3PCWVMPNZ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "6SOGH6UHO3CW44DIPLE3GSQ3PCWVMPNZ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/645YQKOZNHXQUWPAMTGPYQWIGAIJFG3L/?format=api",
    "sender": {
        "address": "db (a) db.net",
        "mailman_id": "968ba4db95324dc4a6e0d2e889d5d6bf",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/968ba4db95324dc4a6e0d2e889d5d6bf/emails/?format=api"
    },
    "sender_name": "Diane Bruce",
    "subject": "[amsat-bb] Re: Diplexer question",
    "date": "2008-10-12T14:57:16Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/645YQKOZNHXQUWPAMTGPYQWIGAIJFG3L/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "On Sun, Oct 12, 2008 at 10:30:03AM -0400, Tim Tapio wrote:\n> I'm installing a diplexer on my downlink side. Since I'm running two\n> antennas, do I just leave the 145 MHz alone or is it more better to\n> terminate it with a 50 ohm load I suspect the load is a better answer.\n\nA diplexer (in this case) is simply two filters, a low pass filter\nfor 145mhz coupled to a high pass filter for 430mhz.\nNormally a filter \"wants\" to be terminated properly to work properly,\nbut in this case, the 145mhz low pass filter is far enough away from the\n430mhz high pass filter it won't matter. However, it should be capped to\nkeep any potential noise from coming in through that port and end up\ninternally radiating inside the filter. It wouldn't be much noise\nbut it doesn't hurt, besides it will keep the water out.\nA 50 ohm bnc terminator as used to be used with cheapernet would do it,\nif you happened to have one in the junkbox, or just solder a piece of\ncopper/brass/pcb on the end of a connector (pl-259 say) to cap it..\n\n>\n> Does the preamp go prior to the diplexer? Or after?\n\nThe preamp is going to amplify the noise if it \"sees\" it. The filter\nshould be in front of the preamp. Unless you are planning on doing EME\nthe loss of nf won't bother you.\n\n> Thanks and 73 de Tim, K4SHF FM04\n\n- 73 Diane VA3DB\n--\n- [email protected] [email protected] http://www.db.net/~db\n",
    "attachments": []
}