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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/F6ZMGMRESW6JTVCNDBXRDEWIMQVOZPVH/?format=api",
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    "message_id": "CAL_=6cS-ediRymbahk5p8ce7mK72NOiHUdFJgSyQP-Cu1Qm2CQ@mail.gmail.com",
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    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YV46NLMZZLAI444ZMLHYUYTYPOWJXRF4/?format=api",
    "sender": {
        "address": "ve3xre (a) gmail.com",
        "mailman_id": "9ef90b19e9014b16bb8d1d69a849f701",
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    "sender_name": "V Chu",
    "subject": "[AMSAT-BB] Re: Phasing Cable/System - 2 Dual-Band Yagi's",
    "date": "2021-11-29T15:31:47Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6JQXPMEM3DG7YYQVDML7S2KUVVLJVLMG/?format=api",
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        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YT7RNP422APW4V2LWZAS7V4AWUG33FLW/?format=api"
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    "content": "I was waiting for him to clarify if he wants more info.\n\nThanks for the clarification.\n\nde VA3HJ mobile\n\nOn Mon., Nov. 29, 2021, 06:33 Fred Glenn <[email protected]> wrote:\n\n> Brian, VA3HJ's answer is correct but incomplete. The 75 ohm cables must\n> each be 1/4 wavelength long. The actual value needed for the phasing cable\n> characteristic impedance is 70.7 ohms. Essentially, taking a 1/4 wavelength\n> of  70.7 ohm cable will transform 50 ohms resistive to 100 ohms resistive.\n> Then take the two 100 ohm impedances and parallel them to get back to 50\n> ohms where you can use any length of 50 ohm cable to get to the\n> transmitter.\n>\n> Fred\n> K9SO\n>\n> \"The characteristic impedance of cables must be such that the proper\n> length of cable will provide an impedance transformation from 50 ohms at\n> the antenna end to 100 ohms at the connecting point. A quarter wavelength\n> of cable that provides the proper characteristic impedance can transform\n> the 50-ohm impedance of each antenna to 100 ohms at the connection point.\n> The characteristic impedance of cables L1 and L2 must be 70.7 ohms.\n> Because 75-ohm cable is readily available, it is generally used to make the\n> phasing harness. Standard 50-ohm impedance cable is used for cable L3,\n> which extends from the connection point to the transceiver.\"\n>\n>\n> On Monday, November 29, 2021, 05:42:55 AM EST, V Chu <[email protected]>\n> wrote:\n>\n>\n> Brian\n>\n> You can use 2 75ohm cable to connect each antenna and join them with a\n> coaxial splitter then 50ohm cable to your Transmitter.\n>\n> de VA3HJ mobile\n>\n> On Sun., Nov. 28, 2021, 23:23 Brian Clark <[email protected]> wrote:\n>\n> Hello Everyone,\n>\n> I have two Dual-Band 2 Meter/440 Yagi's  that I would like to use on a\n> Rotator, with one in the vertical polarity and one in horizontal.\n>\n> Is there a phasing circuit or system that someone can recomend to allow\n> both of these antennas to coexist on one coax input to my radio?\n>\n> Thanks,\n>\n> Brian\n> KF6FES\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\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> AMSAT-NA.\n> Acceptable Use and Privacy Policies available at\n> 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\n> https://mailman.amsat.org\n>\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\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> AMSAT-NA.\n> Acceptable Use and Privacy Policies available at\n> 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\n> https://mailman.amsat.org\n>\n\n\n",
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