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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SGTAYKV3R2FGKEUY2AN6ISQEJQX44ZJS/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "SGTAYKV3R2FGKEUY2AN6ISQEJQX44ZJS",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/J2VNBFEGZ6ROST62L6CFD2TJQEGJIW35/?format=api",
    "sender": {
        "address": "hartzell (a) gmail.com",
        "mailman_id": "11e371d6dacd43b7a2b3a3c751e6641e",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/11e371d6dacd43b7a2b3a3c751e6641e/emails/?format=api"
    },
    "sender_name": "Dave hartzell",
    "subject": "[amsat-bb] Re: Oscar 58 Pass",
    "date": "2007-01-07T07:19:57Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/J2VNBFEGZ6ROST62L6CFD2TJQEGJIW35/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Steve,\n\nYour experience is typical with the current AMSATs in orbit, which are\nall in a low-earth orbit, resulting in a high velocity pass, relative\nto your ground station.  In addition, the higher the frequency, the\ngreater the doppler shift.\n\nMost regular satellite operators use PC-based software to control the\ndoppler shift tuning.  Keplarian elements are published, which can be\nused to predict the orbit and pass times, allowing for prediction of\nthe doppler shift.\n\nI'm guessing most \"modern\" all-mode VHF/UHF rigs support\ncomputer-control.  If you want to work the sats, you really need a rig\nthat does full duplex, so you can hear yourself (which is sometimes\nthe only thing you'll hear on some of the linear transponder sats,\nunfortunately!).  A high-gain directional antenna also helps....\n\n73,\n\nDave\nNøTGD\n\nOn 1/6/07, Steve Raas <[email protected]> wrote:\n> Hello Everyone . I just received the Oscar-58 beacon on 437.4650 and have a\n> question. I have read abt dopler shift and how It can affect radio signals\n> especially with the sats. This being only the 3rd time ive ever even herd a\n> sat I was shocked to note that the frequency drift was a few Hz lower on\n> every cw note ( the beacon ). It reminded me of an old heathkit HF radio\n> that drifted .. but never settled down. Is this about the normal expected\n> Doppler Shift in a cw/ssb signal on the amsats? I was constantly turning the\n> VFO ever so slightly. Or is this more on par for this particular Sat?\n>\n\n",
    "attachments": []
}