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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/AX2K7QIUXT6PVSMB573VTC6EGIBZXBWP/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "AX2K7QIUXT6PVSMB573VTC6EGIBZXBWP",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/AX2K7QIUXT6PVSMB573VTC6EGIBZXBWP/",
    "sender": {
        "address": "kd0ar (a) sbcglobal.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Michael Heim",
    "subject": "[amsat-bb] Re: sun noise and other natural noise sources",
    "date": "2008-09-04T22:15:13Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Thank you, Domenico for the information,\n\nA lot of reading and study on this is in order.  I'm probably different from many microwave ops, as I started high and am working down in frequency, hi.  well, sort of, as I was on 1296 before I was on 10 GHz.   I used the sun noise calculations that you gave, Domenico, as referred to me by another microwave op (for 10 GHz).  Basically he directed me to a website, of which I do not remember, but you were quite correct, I measured 5-6 dB on 10 GHz using my 60 cm offset fed dish.  I am still relatively new to 10 GHz, being only active since last summer.\n\nWithout doing a lot of study, (of which I plan to do anyway, when I get the time to do so), you answered my question, and that is no, I will not see enough of a change in the noise floor (when aimed at the sun) with the antenna gain that I am using to be able to measure, however I should see an increase in the noise floor when aiming at a warm body, ie the earth, or perhaps some object such as a tree, building, etc.\n\nAnyway, that's what I was looking for, a way to test what I have using simple means (and my not having a calibrated signal source).\n\nI HAVE checked the converters using a signal source at a friend's shack, but the unit with the antenna attached  we couldnt, of course make a meaningful measurement.  So I know the frequency is correct, not an image, and the LO is calibrated well enough that I shouldnt have any problem finding the bird once it comes online in mode S.\n\nSo I will consider that if I point from cold sky to earth, if I see a change in background noise, things are probably working.\n\n Michael Heim\nChief Engineer, Forever Broadcasting\nNew Castle PA\nWKST  WJST  WWGY\n814-671-0666\nChapter Chair, SBE-122\nARS KD0AR\n",
    "attachments": []
}