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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/4GXVJTNQTGV5BXKPU75YPIUH747W4BCL/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "4GXVJTNQTGV5BXKPU75YPIUH747W4BCL",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/4GXVJTNQTGV5BXKPU75YPIUH747W4BCL/?format=api",
    "sender": {
        "address": "wandtosborne (a) gmail.com",
        "mailman_id": "e0efce0b56004e129f9360474b5a7a08",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/e0efce0b56004e129f9360474b5a7a08/emails/?format=api"
    },
    "sender_name": "Wendy and Terry Osborne",
    "subject": "[AMSAT-BB] Re: Need advice on circular polarized antennas",
    "date": "2023-12-31T01:58:27Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Joe,\n\nI've found another article on a Polarization Switcher. It's referenced \nin the I8CVS papers.\nI've added it to the dropbox for I8CVS.\nhttps://www.dropbox.com/scl/fo/ne4o6ham0xfwovfdz004a/h?rlkey=sl2jswt7mlf1fnwc9a9t8feuc&dl=0\n\n73 and Happy New year.\n\nTerry Osborne ZL2BAC\n\nOn 27/12/2023 8:29 am, Joseph Amato wrote:\n> Thanks for sending the articles, Terry.  It’s a clever design, and the relays don’t look too expensive.  Maybe there’s even less expensive ones that would be suitable for the low power (< 10 W) used for satellite communications.  It’s great to see what other hams have come up with.\n>\n> Joe K1MNY\n>\n>\n>> On Dec 25, 2023, at 10:13 PM, Wendy and Terry Osborne <[email protected]> wrote:\n>>\n>> Hi Joe,\n>>\n>> The late Domenico I8CVS, designed a switcher that used horizontal and vertically polarised yagis to obtain circular polarization, both RHCP and LHCP as well as horizontal and vertical. It was described in the AMSAT Journal March/April 2007 and May/June 2007.\n>> I've put the articles in dropbox here:\n>> https://www.dropbox.com/scl/fo/ne4o6ham0xfwovfdz004a/h?rlkey=sl2jswt7mlf1fnwc9a9t8feuc&dl=0\n>>\n>> Many years ago I made up a couple of these for the FM Broadcast band and can confirm that the switching system works fine.\n>>\n>> Merry Christmas and 73,\n>>\n>> Terry Osborne ZL2BAC\n>>\n>>\n>> On 25/12/2023 6:08 am, Joseph Amato via AMSAT-BB wrote:\n>>> I’m looking for some advice on antennas for 2 m/70 cm satellite operation.  Presently, I have home-brew yagis for each band, horizontally polarized.  To eliminate fading due to satellite rotation, I want to replace these antennas with circularly polarized ones.  But the new antennas need to be relatively lightweight, because I have to lug them up on a ladder to mount them, and, well, I’m not as young as I used to be.  I have been considering the WiMo circular polarized antennas (#18010 and 18011), but would first like to hear from people who have experience with them.  I like to build things myself, but the WiMo design looks cleverer than anything I’ve been able to come up with so far.  Any advice?  Thanks!\n>>>\n>>> Joe K1MNY\n>>>\n>>> -----------------------------------------------------------\n>>>\n>>> Sent via AMSAT-BB(a)amsat.org. 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>>> Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/\n>>>\n>>> View archives of this mailing list at\n>>> https://mailman.amsat.org/hyperkitty/list/[email protected]\n>>> To unsubscribe send an email to amsat-bb-leave(a)amsat.org\n>>> Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org\n\n",
    "attachments": []
}