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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/UQZI62EULJSZPA22BNBOEAFAV2DLNULA/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "CAJHj7F4KrLPy5dxCTfvsQojyDZrkam2d+H1euLufMFYdpvwrxA@mail.gmail.com",
    "message_id_hash": "UQZI62EULJSZPA22BNBOEAFAV2DLNULA",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/TFMZ2XDDXMYXI2WGQMSM7COZWHGMNEK4/?format=api",
    "sender": {
        "address": "K4IDC (a) comcast.net",
        "mailman_id": "4dbce314f6ee4a31b5263a722d48d1d5",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/4dbce314f6ee4a31b5263a722d48d1d5/emails/?format=api"
    },
    "sender_name": "Robin Midgett",
    "subject": "Re: [amsat-bb] Lindenblads",
    "date": "2014-09-17T15:51:18Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6UARD2FRK74EBKWR2EEPGWPA3WZDEIIV/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/4LOLV56VFWCK5ZK7I5MOOVWAOCE4FWI7/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Gentlemen,\nPerhaps I didn't phrase my question plainly enough. Doug is correct; my\nquestion centers around the perceived benefit of having both LHCP & RHCP\nLindenblads with a switch to select between the two...is there a real\nbenefit?\n\nHaving recently been part of an ARRISS event, I witnessed the benefit of\nbeing able to reverse the sense of the cross-polarized Yagi we were using\nfor the QSO, so it seems to carry forward that having that agility would be\nbeneficial for Lindenblad antennas, which is why I asked for input from\nexperienced Lindenblad users.\n\nAnd yes, the sense of a single Lindy can be changed if the elements are\nmechanically rotated in phase with one another about the Z axis. Saying\nthat it can't be done is akin to saying a Yagi can only be used in one\ndirection, and none of us accept that as truth.\n\nAgain, I appreciate the input from experienced users of this antenna array.\n\n\n\nOn Wed, Sep 17, 2014 at 4:39 AM, Francesco Messineo <\[email protected]> wrote:\n\n> >\n> > -----Original Message-----\n> > From: Robin Midgett <[email protected]>\n> > To: AMSAT-BB <[email protected]>\n> > Sent: Mon, 15 Sep 2014 6:23\n> > Subject: [amsat-bb] Lindenblads\n> >\n> >\n> > Hello to the group,\n> > I'd like to hear from any users of the Lindenblad antennas regarding\n> > switching polarity & circularity.\n> > Based on the article on the AMSAT web page by W6SHP at\n> > http://www.amsat.org/amsat/articles/w6shp/lindy.html, I'm led to believe\n> > that the maximum effect comes from having one Lindy for each of RHCP &\n> LHCP\n> > per band in addition to being able to invert the polarity of each.\n> > I'd like to hear from users concerning how often switching between RH &\n> LH\n> > circularity yields benefits as compared to switching polarity on a single\n> > Lindy.\n>\n> I have used for some time a small satellite station composed of two\n> lindenblads, one for 145 MHz and the other for 435 MHz. The UHF one\n> was a parasitic lindenblad from a well known project of some years ago\n> that I think is still available on the web (I don't remember the\n> details now). I have commented on my experience with lindenblads on\n> this mailing list a few times in the past, so there might be my\n> messages in the archives (if they exist at all).\n> What I can say is: signals are nowhere near the ones you can have with\n> even small yagis with azimuth and elevation controls, also adding two\n> preamplfiers under the antennas greatly improved the chances to make\n> QSOs.\n> I was able to work many contacts with that setup (FT-847 as rtx),\n> mostly CW on the linear sats, but also some FM contacts on all\n> satellites available some years ago (2008-2010), and of course some\n> SSB contacts on the linear sats.\n> I assume that having switchable polarity can only make things better.\n>\n>\n> HTH\n> Frank  IZ8DWF\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://amsat.org/mailman/listinfo/amsat-bb\n>\n",
    "attachments": []
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