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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DRZSS6JB7S5EIQZF4POXW2566YSHETCJ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "DRZSS6JB7S5EIQZF4POXW2566YSHETCJ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/TFMZ2XDDXMYXI2WGQMSM7COZWHGMNEK4/?format=api",
    "sender": {
        "address": "amsat (a) n0jy.org",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Jerry Buxton",
    "subject": "Re: [amsat-bb] Lindenblads",
    "date": "2014-09-17T14:49:15Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TFMZ2XDDXMYXI2WGQMSM7COZWHGMNEK4/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Robin,\n\nI built two Lindenblad antennas some 18 years ago using information from \nthe ARRL Antenna Book, if I recall.  One for 2m, one for 70cm.\nI built them with yardsticks, household wiring, PVC, and twin lead.\nThe worked quite well for MIR and as recently as about 3 years ago I \ntook one out to use at a public service event we did, and also used it \nto copy the HO-68 beacon during event downtime.\nI used the set at Field Day that same year, although with no preamp the \nlinear birds were a bit rough unless they were pretty high up.  But we \nwere in a noisy location, too.\nThey worked very well for FM AO-51 and ISS packet, pretty good on SO-50.\n\nOn these I can switch polarity by simply changing the angle of the \nyardstick-elements, with them being mounted to the PVC with a bolt you \njust rotate them around the bolt to the opposite polarity and put it \nback up on the pole.\n\nTo your question then, when using these if I'm working a linear \npolarization bird I usually just leave it alone.  If it's a CP bird then \nI match that and leave it alone.  Of course, I don't get too excited if \nit fades because it's not like a terrestrial band opening where you \ndon't know if it will happen again and to where.  With satellites it \nwill either fade back the other way or worst case, I work the same bird \non the next pass in 1 1/2 or 12 hours.\n\nAnd they are very picky about their configuration for circularity.  At \none Field Day, I forgot what the angle was supposed to be.  It was \nmarked on the PVC but in transit when I fold the \"arms\" all horizontal, \nthe PVC marking/end caps got turned as well.  I set it (guessed) wrong, \nit didn't work worth a hoot.  Go home, look it up (this was B.S., Before \nSmart-phone) go back and set it right made a big difference for the rest \nof the event!\n\nYou can just see the 2 meter in this picture from Field Day.  If you \nlook closely, you'll see the folded dipole of house wiring on the \nelement to the right.\nhttp://n0jy.org/Symposium/lindy.jpg\n\nGood luck, 73!\n\nJerry Buxton, NØJY\n\nOn 9/14/2014 8:38 PM, Robin Midgett wrote:\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 & 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 & LH\n> circularity yields benefits as compared to switching polarity on a single\n> Lindy.\n>\n> I've long had an interest in satellite operation. Due to being involved\n> with a recent ARISS event, the interest level has been elevated..it's time\n> for me to get on the birds. I welcome your input regarding the Lindenblad\n> antennas.\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>\n>\n\n",
    "attachments": []
}