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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/X6A55EMS2U4VDYOPMBO5FCPYCOWJAE2Z/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "000701c7ddef$e1ddcc00$6601a8c0@temple0tpa952s",
    "message_id_hash": "X6A55EMS2U4VDYOPMBO5FCPYCOWJAE2Z",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/IJCHYVXZHZ3TSW5Y6B5SD5FESF6L54HU/?format=api",
    "sender": {
        "address": "n5td (a) vvm.com",
        "mailman_id": "59af6a702c534ebb9789f264798003e2",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/59af6a702c534ebb9789f264798003e2/emails/?format=api"
    },
    "sender_name": "Charlie Schlieper",
    "subject": "[amsat-bb] Re: Success - and thanks!",
    "date": "2007-08-13T21:21:11Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IJCHYVXZHZ3TSW5Y6B5SD5FESF6L54HU/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Congratulations to Scott, NW2S, on his recent successes\nin working satellites.\n\nIn reference to the stated problem:\n> The other downside is that even with two transceivers, I'm \n> unable to work full-duplex. The two bands on the antenna \n> use separate elements and feed points, but share a boom. \n> Transmitting on 2m completely overloads the front-end of \n> the IC-7000. While full duplex would be useful, it's not\n> absolutely necessary.\n\nMay I mention some old ideas that could improve the \n\"Mode-J\" desense, which is a very common problem.  \n\nThere are several ways to improve Mode-J desense.\n  \n   1.)  One is by using a combination of a \"Mode-J Filter\" on \nthe 2-meter side, \"MMf200-7\" which attenuates harmonics\noutside the 2m band that can plague the 70cm receiving side,\nand a \"PSF-432 Bandpass Filter\" added on the 70cm UHF\nside. (I have several sets of these filters, which are obtainable\nfrom Spectrum International, Inc., Concord, MA, and they \nwork very well!)  \n \n  2.)  Physical separation of antennas, but I don't recommend\nthis often because it simply doesn't satisfy the needs of most\nusers.\n\n  3.)  By the inverted use of a \"2m/70cm Diplexer\" (commonly\ncalled duplexers now) connected in the UHF side, which has \nthe common port connected to the UHF antenna, the 70cm\nport connected to the UHF radio input, and the 2-meter port\nconnected to a small 50-ohm dummy load of some kind.   \n(There used to be an example of this on the AMSAT site.)\n\n   Additional comments:  A few other items could have some\naffect, such as proper grounding, the amount of uplink power\nused, circular polarization, and the use of high-quality coaxial\ntransmission lines.   \n\n73,\nCharlie, N5TD\nTemple, Tx\n\n\n",
    "attachments": []
}