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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YFKCEOHFZHE32G7IXZE6ARYJMJSQ2V4C/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAEKn9qZJ+wBtJDUDW8qYfnQk6WkhhrSwv53f9c2zHtmyQkAJgQ@mail.gmail.com",
    "message_id_hash": "YFKCEOHFZHE32G7IXZE6ARYJMJSQ2V4C",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YFKCEOHFZHE32G7IXZE6ARYJMJSQ2V4C/",
    "sender": {
        "address": "davids (a) mediamachine.com",
        "mailman_id": "11b702aa77c64867a61ecd84f22b23de",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/11b702aa77c64867a61ecd84f22b23de/emails/"
    },
    "sender_name": "David Spoelstra",
    "subject": "[AMSAT-BB] Re: Linear vs FM Sats",
    "date": "2023-09-04T18:39:19Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "When operating v/u where should the filter go? 70cm side.\nDoes it matter if I am operating FM or linear as far as desense is\nconcerned? If you are having desense, you are having it regardless of the\nmode. You may not notice it with the FM birds because their transmitters\nare so strong and because of the FM capture effect.\nCan I use the diplexer in the Arrow antenna as a filter? Yes, however there\nare several issues with it:\n1. It can only handle 10 watts.\n2. I don't know how good the separation is with regard to the Comet (or\nothers) in the AMSAT article Ray KN2K referred you to.\n3. It has a 2m pigtail that might (probably?) pickup some of the 2m energy\ntransmitted and feed it back to the 70cm side which will desense it and\ndefeat what you are trying to accomplish like the article says.\n\n-David, N9KT\n\n\nOn Mon, Sep 4, 2023 at 1:10 PM Erik Eitel via AMSAT-BB <[email protected]>\nwrote:\n\n> I am fairly new to chasing satellites.  I have the FM sats down fairly\n> well and I am trying to get into the linear birds.\n>\n> Here’s my set up:\n>\n> -Arrow antenna with diplexer mounted on bike repair stand.\n> -ICOM 2730a (I used this with great success on the FM sats)\n> -2 Yaesu FT-818 (replacing the 2730 for all sats)\n>\n> I’ve read many articles and visited many web pages but I am confused a bit\n> with desense.\n> When operating v/u where should the filter go?  On the 2m side or the 70cm\n> side?\n> Does it matter if I am operating FM or linear as far as desense is\n> concerned?  I have no problem hearing myself while operating FM v/u sats\n> using the FT-818s.\n> Can I use the diplexer in the Arrow antenna as a filter?\n>\n> Still trying to get the hang of the linear birds.\n>\n> Thanks for the help.\n>\n>\n> 73\n> Erik\n> K2ERK - FN20\n>\n>\n> -----------------------------------------------------------\n>\n> Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> AMSAT-NA.\n> Acceptable Use and Privacy Policies available at\n> https://www.amsat.org/about-amsat/\n>\n> View archives of this mailing list at\n> https://mailman.amsat.org/hyperkitty/list/[email protected]\n> To unsubscribe send an email to amsat-bb-leave(a)amsat.org\n> Manage all of your AMSAT-NA mailing list preferences at\n> https://mailman.amsat.org\n\n\n",
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