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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BJZJ5NGFU4LXQ6RAJN6B6IG2MSATFPOT/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "BJZJ5NGFU4LXQ6RAJN6B6IG2MSATFPOT",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/IE5ERSBKJQ4Q7WKQZ6T5YBXANEFP5A6E/?format=api",
    "sender": {
        "address": "w7lrd (a) comcast.net",
        "mailman_id": "717aa2a241704c7497e9abd8c983f6b7",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/717aa2a241704c7497e9abd8c983f6b7/emails/?format=api"
    },
    "sender_name": "73 Bob W7LRD",
    "subject": "Re: [amsat-bb] Question on 23cm WiMo Helix",
    "date": "2020-04-02T17:08:38Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IE5ERSBKJQ4Q7WKQZ6T5YBXANEFP5A6E/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Tom et al-- Back in the days of AO-40 (sob sob) I built a 16 turn RHCP helix.  Several of which I sold around the country.  Currently I   am using a 24 el  looper.  I am planning to put my helix back up there (20\" tilt over tower) with a relay to switch between the two antennas just of fun.  \nI use 70 feet of LMR600 I could have gotten by with LMR 400 which I use on U & V. I use a IC-910 at 10W.  I have a 70W amp that's waiting for my ambition to catch up. The book Antennas by Krauss has a ton of valuable helix info. Here in W. Washington there is some local L band activity.  With mountains all around L band presents some interesting bouncing propagation. We only have one satellite (AO-92) with L band capability, and that's only once a week. I would like to see a linear bird with L band, maybe even S band down like the aforementioned AO-40 (sob sob). I'm sure others will chime in with information.  On Ebay there are a few antennas available https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=1.2+ghz+yagi&_sacat=0\nI have one I have yet to try out.  ABout $50 it's cheap enough to try.  I don't know if any of us are using one of these.  At this time we all have the time to play radio <grin>.  Lots of options Tom.\n73 and stay safe out there\nBob W7LRD\n\n\n\n> On April 2, 2020 at 8:14 AM Thomas Schaefer via AMSAT-BB <[email protected]> wrote:\n> \n> \n> Reading the prior posts about the counterbalance, made me think again about adding the 23 cm helix antenna to my sat beams before they go up, but I wanted to check my thinking on this…\n> \n> There appears to be only one L band satellite, AO-92. That is an uplink. Given that, I obviously have no need for a preamp. But I also believe that I need not worry too much about using anything better than LMR-400. In checking the Times Microwave loss calculator, using LMR400 over a 50 foot run would lose 2.6 dB. Using LMR-600, would lose 1.7 dB. 7/8” hardline would be .8 dB. But given that the Helix has 13 dBd, that is over 100 watts at the antenna. Plenty AO-92.\n> \n> So while cable loss seems academic, are there any satellites in the works accessible from the US with an L band downlink? If not, it appears LMR-400 is just fine (even with a short loop of LMR-400 UF at the top for the rotor).\n> \n> Thanks,\n> \n> Tom Schaefer, NY4I\n> Blog: www.ny4i.com\n> Madeira Beach, FL (Grid: EL87ot)\n> \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 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: https://www.amsat.org/mailman/listinfo/amsat-bb\n",
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