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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LXQCDQAUNQQ5PSTZOFB2YXP34LTKX4Y3/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "468D655D6E9F4385AF24E52A9A00BDE1@CSI9020",
    "message_id_hash": "LXQCDQAUNQQ5PSTZOFB2YXP34LTKX4Y3",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/34METF2HX5RJ3FDGHK3BKVC37DGLDGYI/?format=api",
    "sender": {
        "address": "scott23192 (a) gmail.com",
        "mailman_id": "120e10e05ba14969a11da0a96d21e355",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/120e10e05ba14969a11da0a96d21e355/emails/?format=api"
    },
    "sender_name": "Scott",
    "subject": "Re: [amsat-bb] AO-07 Popularity?",
    "date": "2019-09-21T18:43:10Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XZEI4CYGF4VTN4ZU6CFPJR5ZKYPNHBSB/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": ">>>Where is the sweet spot?\n\nThe link below is a screen shot that I took one day back in March when a \nstrong CW signal killed the transponder on AO-7.  Before the 2m downlink \nwent offline you can see the three places that I believe people are \nreferring to.\n\nLooks to me like 145.928, 145.943, & 145.959, more or less.\n\nHere's that image:\n\nhttps://www.dropbox.com/s/ztffqf1afwdmrt0/screen.png?raw=1\n\n\nI have vastly less experience on the linear transponders than most, but here \nare a couple of things I've noticed repeatedly that might be helpful on \nAO-7.\n\n#1, there is a LOT of difference in downlink signal strength from one pass \nto the next.  So, if you hear little or no traffic on the transponder, it's \nnot necessarily anything you are doing wrong.\n\n#2, don't overlook the low-elevation period at the beginning or end of a \npass.  I've often noticed downlink signals 2 or 3 times stronger on AO-7 \njust after AOS and just before LOS.\n\n#3, it's a shared resource.  So, if you see (on an SDR waterfall) or hear \nanother station with an extremely strong signal, it might be worth waiting \nto transmit until they stop -- your signal will probably be much more \neffective\n\n#4, I've noticed that when I take off my headphones and stop the recorder, \nsignals instantly jump to max scale!  If you can perfect a move where you \nFAKE taking off your headphones and only PRETEND to stop the recorder, you \nmight have a shot at some of the best audio you've heard via satellite.\n\n-Scott,  K4KDR\n\n=====================================\n\n----Original Message----- \nFrom: Doug Phelps via AMSAT-BB\nSent: Saturday, September 21, 2019 2:20 PM\nTo: [email protected] ; [email protected]\nCc: [email protected]\nSubject: Re: [amsat-bb] AO-07 Popularity?\n\nWhere is the sweet spot?\n\n=====================================\n\n-------- Original Message --------\nOn Sep 10, 2019, 11:37 AM, Burns Fisher via AMSAT-BB wrote:\n\n> AO-7 also works best in a small sweet spot in its passband. If you don't\n> know that it can be frustrating to hear yourself all garbled. All that\n> said, I think most linears have relatively low use. What is your\n> experience in Australia with the XW satellites (which work absolutely\n> great!)?\n>\n> On Tue, Sep 10, 2019 at 8:24 AM James Pierce via AMSAT-BB <\n> [email protected]> wrote:\n>\n>> I’ve put out calls a number of times on AO-07 as it passes over Australia\n>> and while I hear my own single back clearly I’ve never had a reply. I\n>> guess I’m curious if there is a calling protocol I’m missing, or a\n>> particular part of the passband etc? As a higher altitude bird with great\n>> coverage it would seems logical to me that it would be popular? Am I\n>> missing something?\n>>\n>> James.\n\n",
    "attachments": []
}