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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KMXRMTHTHVOUJAGOONL4IVWH2ZSHX5TD/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "CAHKCqnB=CcUqbTzhDiQXZUu2Sk9VF5MGKJUUy+Es5wyqp_ezCg@mail.gmail.com",
    "message_id_hash": "KMXRMTHTHVOUJAGOONL4IVWH2ZSHX5TD",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/3CL2PQGWNCG5LJEJU5Q4EQ5NCY3WO7ZF/?format=api",
    "sender": {
        "address": "mjohns+K0JM (a) luther.edu",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Mark D. Johns",
    "subject": "Re: [amsat-bb] Station advice: coax",
    "date": "2018-11-17T20:06:05Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6K2BHAUCHOMAHNZC77DJF7Q6MAOZDZ3Q/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7QHHCOCOL4IZQYALZG4GP5I7EWNLHUN4/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "With that kind of coax run, you'll definitely want the lowest loss feedline\nyou can afford, and you'll probably want the pre-amps sooner than later. If\nhard line is out of the picture, LMR 600 is a good alternative. Several\noutlets will sell custom lengths with connectors attached. You can get by\nwith LMR 400 or Belden 9913 on the 2 meter side, but loss at 435 MHz will\nbe greater. I would avoid the diplexer like the plague.\n\nAs GEO mentioned, you really only need the flexy stuff at the point where\nthings are rotating. I run LMR 600 to the pre-amp, just below the rotor,\nand ultra-flex from the pre-amp to the antenna. A good, moderate-cost\nalternative for pre-amps are the \"Mini\" pre-amps from SHF Elektronik in\nGermany http://www.shf-elektronik.de/en/\n--\nMark D. Johns\nKØJM / MØGZO / ex-9H3DJ / ex-KØMDJ\nBrooklyn Park, MN USA   EN35hd\n-----------------------------------------------\n\"Heaven goes by favor; if it went by merit,\n   you would stay out and your dog would go in.\"\n    ---Mark Twain\n\n\nOn Sat, Nov 17, 2018 at 1:12 PM GEO Badger via AMSAT-BB <[email protected]>\nwrote:\n\n> Keith,\n> You want the lowest loss coax you can afford for your run. ½\" hard line\n> would be a good choice, though not inexpensive and neither are the\n> connectors. Plus it is rather rigid and can be difficult to handle.\n> Terminate it at the rotator and use a flexible jumper from there to the\n> antennas.\n> To use a diplexer you'll need one at both ends, assuming 2 antennas.\n> Recall that a diplexer will have insertion loss of >3 dB. And that I don't\n> believe they will pass DC. Though I haven't ever checked that. ---\n>  Ciao baby, catch you on the flip side.\n>  GEO\n>\n>  http://www.w3ab.org\n>\n> Time flies like an arrow, fruit flies like a banana.\n>\n>       From: \"Keith E. Brandt, WD9GET\" <[email protected]>\n>  To: [email protected]\n>  Sent: Saturday, November 17, 2018 10:11 AM\n>  Subject: [amsat-bb] Station advice: coax\n>\n> There's been a lot of good station advice on the reflector recently that\n> I've really appreciated. I'm slowly but surely building up my sat ground\n> station. I've got my Yaesu G5400B connected and running and I've got an\n> antenna plan. The next issue is running coax.\n>\n> What's the recommendation on coax runs? It looks like I'll have between\n> 75 and 100 ft from the shack to the mount. I can envision running a\n> separate line for 2m and 440, but is it also effective to use a diplexer\n> at the antenna? Does that limit my ability to later add a mast-mounted\n> preamp with power-over-coax? (I'll probably add preamp(s) at a later date)\n>\n> Is the ultraflex coax really necessary for hooking up around the\n> rotator? I'm sure it's better, but is it really worth the extra cost? I\n> certainly don't want to pay the high price for ultraflex for the full\n> run, especially if I'm using two lines.\n>\n> Thoughts appreciated.\n>\n> 73,\n> Keith\n> --\n> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n> Keith E. Brandt, MD, MPH\n> /[email protected]/\n>\n> /Christianity and science are opposed… but only in the same sense as my\n> thumb\n> and forefinger are opposed- and between them I can grasp everything.\n> /—Sir William Bragg (Nobel Prize for Physics- 1915)\n>\n> *This message transmitted with 100% recycled electrons\n> _______________________________________________\n> Sent via [email protected]. 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> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>\n>\n>\n> _______________________________________________\n> Sent via [email protected]. 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> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>\n",
    "attachments": []
}