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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MUOU5ZPNWB6TLHZN4ZG4ZLQC3T7ORQXL/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "CAPovOwcpmTb3k+AiM4G_uYj9NuZHTSzXZdt1vjO9iWSLsh9FCA@mail.gmail.com",
    "message_id_hash": "MUOU5ZPNWB6TLHZN4ZG4ZLQC3T7ORQXL",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/TXA3GBI5IJS37BEABRCAVCQKJAOU2WLL/?format=api",
    "sender": {
        "address": "kayakfishtx (a) gmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Clayton Coleman",
    "subject": "Re: [amsat-bb] Advice for a portable ground station",
    "date": "2015-01-16T14:29:19Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TXA3GBI5IJS37BEABRCAVCQKJAOU2WLL/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I am not a fan of using RG-58 for satellite portable.  I've worked\nwith too many people trying to use 5-10' runs of RG-58 only to see\nthem become very frustrated at their inability to work SO-50.  Keep\nyour feedline as short as possible if you are using RG-58.  Remember,\nnot all RG-58 is created equal.\n\nMy preferred feedline is LMR-240uf (UltraFlex) for portable use.  It's\na little more expensive but I can easily get away with a 10' length\nbetween the Arrow and my transceiver.  Use quality connectors\ninstalled on quality feedline.  Try to avoid gender-changing adapters\nif possible.\n\nA lot of published material on the Internet and in print specifically\ntalks about FM satellites like AO-27 and AO-51.  They had great\ndownlink signals compared to SO-50.  With SO-50 being our only FM\nbird, we need to set realistic expectations that extended whips and\nRG-58 coax are not going to perform as well as they did on the former\nFM satellites.\n\nFox-1 series satellites, on the other hand, should be a game-changer\nand open the door again for more modest portable stations.\n\n73\nClayton\nW5PFG\n\nOn Fri, Jan 16, 2015 at 1:06 AM,  <[email protected]> wrote:\n> The lack of a fully searchable archive for this list has made this post necessary, my apologies for a noob-style query.\n>\n>\n> I’m gradually assembling a portable ground station for the FM satellites, primarily using John Heath’s (G7HIA) article “Down-to-Earth Satellite Communications” (PDF), focusing on his “Awesome” configuration:\n>\n>\n> Dual-band HT\n>\n>\n> Diplexer\n>\n>\n> 2m amplifier\n>\n>\n> 70cm preamplifier\n>\n>\n> Arrow II antenna\n>\n>\n>\n> In that article he uses RG58 coax, perhaps 15-20 feet max.  Is there a better choice that also works in that application?  Considering the lengths involved, price per foot is not really an issue.\n>\n>\n> He also calls out an RF choke at the feed point of the 70cm antenna, but gives no detail about its material or construction.  It looks to me like a few turns of RG58 on some type of ferrite core.  I’ve spent hours Googling for information (commercial or DIY) and have come up mostly empty-handed.  All the “meaty” stuff is for HF only.\n>\n>\n> A final question concerns the various connectors involved.  The illustrations in that article aren’t the best, but it seems that he’s using BNC terminators on all the cables, and BNC-to-UHF adapters where required.  I’m concerned (perhaps too much) about cumulative losses, both from the coax and all those adapters.\n>\n>\n> My goal is a tripod-mounted antenna, operating on battery power from various parks and forest preserves nearby.\n>\n>\n> Can anyone clarify my understanding here?\n>\n>\n> Tom WZ9U\n>\n>\n>\n>\n> Sent from Windows Mail\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions expressed\n> are solely those of the author, and do not reflect the official views of AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n",
    "attachments": []
}