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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TJHYKMBTA3K5URFINH5GVLV6FAFPMYDZ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "CAAJiE8NZMpqVjBW2=Jkc3g1__JaB1QQ7DDJ3WBpdJhVw=W2aww@mail.gmail.com",
    "message_id_hash": "TJHYKMBTA3K5URFINH5GVLV6FAFPMYDZ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/TJHYKMBTA3K5URFINH5GVLV6FAFPMYDZ/?format=api",
    "sender": {
        "address": "kb2ysi (a) gmail.com",
        "mailman_id": "1ea455b723224992934ae02082411602",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/1ea455b723224992934ae02082411602/emails/?format=api"
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    "sender_name": "Don KB2YSI",
    "subject": "[AMSAT-BB] Re: Linear vs FM Sats",
    "date": "2023-09-04T19:37:30Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
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    "content": "I switched from a diplexer to a mini-circuits BLP-200+ for the weight\nsavings. I had always left it inline with the 2m antenna, and have been\nable to TX over 10w through it without issue using an IC-7100.\n\nKeeping the power low certainly helps a lot, but sometimes you need a\nfilter of some kind.\n\n--... ...--\nDon KB2YSI\n\nOn Mon, Sep 4, 2023, 15:04 A.J. Tobia AJ2I via AMSAT-BB <[email protected]>\nwrote:\n\n> I've never had a desense problem operating 5w into linear satellites U/V\n> or V/U with a 817/d74. I would suspect 817/817 would be the same.\n>\n> For grin's I put a diplexer and even a mini circuits LPF inline on both\n> U/V antenna connections and noticed zero difference in being able to RX\n> then without them\n>\n> A.J.\n> AJ2I\n>\n> *From:* David Spoelstra via AMSAT-BB <[email protected]>\n> *Sent:* Monday, September 4, 2023 2:40 PM\n> *To:* Erik Eitel <[email protected]>\n> *Cc:* AMSAT BB <[email protected]>\n> *Subject:* [AMSAT-BB] Re: Linear vs FM Sats\n>\n> When operating v/u where should the filter go? 70cm side.\n> Does it matter if I am operating FM or linear as far as desense is\n> concerned? If you are having desense, you are having it regardless of the\n> mode. You may not notice it with the FM birds because their transmitters\n> are so strong and because of the FM capture effect.\n> Can I use the diplexer in the Arrow antenna as a filter? Yes, however\n> there are several issues with it:\n> 1. It can only handle 10 watts.\n> 2. I don't know how good the separation is with regard to the Comet (or\n> others) in the AMSAT article Ray KN2K referred you to.\n> 3. It has a 2m pigtail that might (probably?) pickup some of the 2m energy\n> transmitted and feed it back to the 70cm side which will desense it and\n> defeat what you are trying to accomplish like the article says.\n>\n> -David, N9KT\n>\n>\n> On Mon, Sep 4, 2023 at 1:10 PM Erik Eitel via AMSAT-BB <[email protected]>\n> wrote:\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> -----------------------------------------------------------\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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