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/VJKCGXBUXBISKMMP5MZROAPY3PUBRYXQ/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "VJKCGXBUXBISKMMP5MZROAPY3PUBRYXQ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FNSF5QZPFKYE7MJGYQQITENMAAYCINAN/",
    "sender": {
        "address": "simon (a) sdr-radio.com",
        "mailman_id": "7ad433ec4db746178aa134ed7c5517b4",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/7ad433ec4db746178aa134ed7c5517b4/emails/"
    },
    "sender_name": "Simon Brown",
    "subject": "Re: [amsat-bb] Polarisation Switch",
    "date": "2014-12-25T16:26:30Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MGOF7UDQS5QCNTBIW2RPBXMMDWWWR7JH/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/QSBV2AJP7WWAG32I3NJGZL4GW6ASG4A6/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Wouter,\n\n \n\nMany thanks and also thanks to Ken. I’m currently sorting out the station on the FO-29 passes, mainly debugging the software.\n\n \n\nFWIW I am using a NetSDR + Down-converter (from RFspace) on RX and a TS-2000 on TX. Using the SDR on RX is so much better than flying blind IMO J . I need to get some cables ordered to I can easily switch between 2m and 70cms, when I do this I’ll start with AO-73.\n\n \n\nSimon Brown G4ELI\nhttp://v2.sdr-radio.com\n\n \n\nFrom: Wouter Weggelaar [mailto:[email protected]] \nSent: 25 December 2014 11:11\nTo: Simon Brown\nCc: AMSAT BB\nSubject: Re: [amsat-bb] Polarisation Switch\n\n \n\nHi Simon,\n\nThis depends on the satellite and its attitude.\n\nFor instance, Delfi-C3 carries circular antennas (canted turnstile) and is free tumbling. So you would need to switch polarisation as the satellite spins. FUNcube has linear antennas and also is free tumbling, so if you listen to it with a circular antenna there is no need to switch.\n\nNote the following:\n\nCircular in the wrong sense gives 20dB of loss (listening to LHCP signals with an RHCP antenna and vice versa)\n\nCircular to linear gives 3dB loss (listening with a horizontal / vertical / diagonal antenna to a circular spacecraft or vice versa)\n\nNow if the satellite is oriented or spin stabalised towards the earth, the polarisation will be known, and matching the apporopriate polarisation on the ground gives you the best signals.\n\nWouter  PA3WEG\n\n \n\nOn Thu, Dec 25, 2014 at 8:17 AM, Simon Brown <[email protected]> wrote:\n\nHi All,\n\n\n\nIs there a logical way to know which is the optimal polarization (left,\nright) for a LEO?\n\n\n\nSimon Brown G4ELI\nhttp://v2.sdr-radio.com\n\n\n\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: http://amsat.org/mailman/listinfo/amsat-bb\n\n",
    "attachments": []
}