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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/52EPEQZJ6GYU4XSY55WPN5375CY5ZS6A/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "52EPEQZJ6GYU4XSY55WPN5375CY5ZS6A",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/52EPEQZJ6GYU4XSY55WPN5375CY5ZS6A/",
    "sender": {
        "address": "on4cjq (a) telenet.be",
        "mailman_id": "7e9b83e825454396a7e1323e393eb5fc",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/7e9b83e825454396a7e1323e393eb5fc/emails/"
    },
    "sender_name": "[email protected]",
    "subject": "[AMSAT-BB] Re: Need advice on circular polarized antennas",
    "date": "2023-12-31T07:27:57Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hello Joe,\n\nI made this switch myself yeras ago, see QRZ.COM page. Switches and antennas. Made it with small SMA relays, they can handle enough pwr on V/UHF for satwork.\nYou just need to put the antennes in X form and important is to see which side is the 'HOT' end off both the dipoles. If the antennas are put up the wrong way, your polarisation will not be correct. All coax in the boxes are measured with analyser for exact lenghts to 1/4L and 1/2L. It works FB!!.\nIf you only want RHCP/LHCP, its easy to manage when they have folded dipoles for example. Put a TOHTSU CX-120P relais in only 1 dipole box per crossyagi, you can connect directly thze center dipole-end to the relais which switches the polarisation. I've done this on a portable antenne, all elements placed 1/4L between the 2 planes.\nThis method is more expensive...relays costs.\n\n\nBest 73's Jerry\n\n----- Oorspronkelijk bericht -----\nVan: \"Joseph Amato via AMSAT-BB\" <[email protected]>\nAan: \"amsat-bb\" <[email protected]>\nVerzonden: Zondag 24 december 2023 18:08:50\nOnderwerp: [AMSAT-BB] Need advice on circular polarized antennas\n\nI’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\nJoe K1MNY\n\n-----------------------------------------------------------\n\nSent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available\nto all interested persons worldwide without requiring membership. Opinions expressed\nare solely those of the author, and do not reflect the official views of AMSAT-NA. \nAcceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/\n\nView archives of this mailing list at\nhttps://mailman.amsat.org/hyperkitty/list/[email protected]\nTo unsubscribe send an email to amsat-bb-leave(a)amsat.org\nManage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org\n",
    "attachments": []
}