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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/D3ORW66ZLYOJTIMLWRPCFWBQNGMWCDZA/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "D3ORW66ZLYOJTIMLWRPCFWBQNGMWCDZA",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YVFJXOA5COUXOIUAVSTGR3EKXJ2C7STS/?format=api",
    "sender": {
        "address": "k6vug (a) sbcglobal.net",
        "mailman_id": "37fd9aee884c4835a5c51104b6295d3a",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/37fd9aee884c4835a5c51104b6295d3a/emails/?format=api"
    },
    "sender_name": "[email protected]",
    "subject": "Re: [amsat-bb] Doppler shift question",
    "date": "2019-06-06T15:30:23Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/O6KTB5WLB7PYW4BD2CUGZNJG2JPCAJXS/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": " About AM vs SSB - AM signals sound the same even if the carrier is a bit off frequency, whereas SSB signals can become difficult to copy when off-frequency.  Being able to copy without having to fiddle with the controls would be important in aviation.  \n \nUmesh, k6vug  \n \n \n \n    On Thursday, June 6, 2019, 7:38:34 AM PDT, Noel Petit via AMSAT-BB <[email protected]> wrote:  \n \n the other reason to stick with AM is that you can hear if other stations \nare trying to break in. FM has capture and blocks all but the strongest \nstation. AM can superimpose multiple signals and hear if emergency calls \nmay be made. Additionally, in the '30's FM was nearly impossible to \ngenerate reliably. AM doesn't depend on the transmitter's stability (to \nan extent).\n\nNoel Petit - WB0VGI\n\nOn 6/6/2019 8:51 AM, Dave Webb KB1PVH via AMSAT-BB wrote:\n> I'm pretty sure the reasons for AM in aviation was because equipment was\n> cheap and easy to build when the aviation band was formed and if 2 stations\n> doubled they would both be heard.\n>\n>  My guess for not not having perceived doppler in aviation is because\n> aircraft aren't flying at 17,500mph and they are using VHF frequencies.\n> Feel free to contact me if I'm wrong.\n>\n> Dave-KB1PVH\n>\n>\n> Sent from my Galaxy S9\n>\n> On Thu, Jun 6, 2019, 8:44 AM KC9SGV via AMSAT-BB <[email protected]> wrote:\n>\n>> More train Doppler effect.\n>> These are sound waves, but the RF FM principle is the same.\n>> Not sure why they don't use AM in space, like in aviation...I.e. NO\n>> Doppler effect.\n>>\n>> https://youtu.be/fWX38qjECyE\n>>\n>> KC9SGV\n>>\n>> Sent from my iPad\n>>\n>>\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: https://www.amsat.org/mailman/listinfo/amsat-bb\n_______________________________________________\nSent via [email protected]. 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.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb\n  \n",
    "attachments": []
}