Email Detail

HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3PPDW45M6RFJTEC3J7X6D5G6DY4E6HB6/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "3PPDW45M6RFJTEC3J7X6D5G6DY4E6HB6",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/ZG77UF73HWE6AUGCKDSZCYYKSGRT6SXG/",
    "sender": {
        "address": "kf6kyi (a) gmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Mark VandeWettering",
    "subject": "[amsat-bb] Re: OT - Weather satellite antennas",
    "date": "2008-06-12T19:04:26Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZG77UF73HWE6AUGCKDSZCYYKSGRT6SXG/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Ed Tump wrote:\n> Folks,\n>\n> Thanks for the response on power. Now I wonder if my Arrow satellite antenna\n> will work for these weather satellites or my AL800 HT antenna.\n>\n> Any ideas?\n>\n> Thanks.\n>\n> 73,\n>\n> Ed\n>\n> KC9GWK\n> Grid EN52\n>\n> AmSat Member\n>\n>   \nI've done a bit of work recording the NOAA satellites, using the \nwideband FM settings on my little Yaesu VX-3R, or the Wide FM mode on my \nRadio Shack Pro-60 hand scanner and tracking it by hand with my Arrow \nantenna.  The arrow definitely provides significant gain around 137 Mhz, \nand I am able to get fairly clear recordings.  The major problem isn't \nactually antenna gain, but the filter bandwidth of the receivers.  Wide \nFM is actually way too wide: the satellite actually uses about 50khz \nbandwidth, and the Wide FM filter bandwidth is more like 200khz, which \nmeans two things: you get about six db more noise, and you can get \ninterference from other sources, such as other satellites.  For \ninstance, I blogged about this a while ago:\n\nhttp://brainwagon.org/2008/02/09/saturday-noaa-17-pass/\n\nOn this pass, I actually used a small preamp, which really doesn't help \nwith my setup (handheld yagi means coax losses are low).  I wrote my \nown  apt decoder, which still had some bugs in this incarnation, so  you \ncan see that I lost sync a couple of times.  The  bright  rectangle of \nnoise overlayed is probably  an Orbcomm satellite operating  on a nearby \nfrequency: a  weather receiver with smaller frequency bandwidth would be \nhelpful.\n\nYou might ask what you can do with just the normal narrow fm rece[topm \npf upir average HT.  I did that experiment too.\n\nhttp://brainwagon.org/2007/12/16/narrow-versus-wide-fm/\nhttp://brainwagon.org/wp-content/uploads/2007/12/test.jpg\n\nYou can see all sorts of clipping artifacts at the beginning where the \nreceiver is set in narrow mode.  In particular, you can't actually \nreproduce the nice stepped gradient that appears between the images.  In \nwide band, we get much better dynamic range.\n\nIf you nose around my blog, perhaps searching for noaa, you can find \nother pictures that I did.   All of these were recorded on my Macbook \nusing Audacity, fed from my Pro-60 or my VX-3R wired to my dual band \nArrow antenna, and then decoded with my own software.\n\nFeel free to hit me with email if you have any further questions:\n\n    Mark KF6KYI\n\n\n>  \n>\n>  \n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>   \n\n",
    "attachments": []
}