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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DUWSDSCFX4OWFDDD75EZ3NSUBMJ43PSR/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAKXf1rGG2xAENiYtdO3qKU1SefPZ6bY=kswDOecbYxn8QQaq9g@mail.gmail.com",
    "message_id_hash": "DUWSDSCFX4OWFDDD75EZ3NSUBMJ43PSR",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/5K6YG7KN5ZJQMREUFN4NNP7OXZGYLSXM/",
    "sender": {
        "address": "wouterweg (a) gmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Wouter Weggelaar",
    "subject": "Re: [amsat-bb] Update on FunCube-3 / EO-79 Interference",
    "date": "2016-11-14T19:18:38Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XDGHICXKRONTDFGDTIYNSICO2CL45NZ7/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Dani, you are right.\n\nWhat you are seeing is the combination of the attack and decay time of\nthe AGC with a strong signal.\nYou can see the AGC bringing the noise back up as soon as the carrier is gone.\nThe transponder is fast-attack and slow decay on the AGC.\n\nSince the downlink passband is a bit stronger as compared to\nFUNcube-1, you can now more clearly see the passband.\n\nWouter PA3WEG\n\nOn Sun, Nov 13, 2016 at 6:20 PM, Dani EA4GPZ <[email protected]> wrote:\n> El 13/11/16 a las 17:55, Scott escribió:\n>\n>> I have uploaded a screen shot of my waterfall showing how the wideband\n>> stream comes & goes in response to activation of the transponder at:\n>> https://dl.dropboxusercontent.com/u/31460496/ham/2016-11-13--EO-79.png\n>\n> Hi Scott,\n>\n> I think that what you're seeing is just the noise floor of the\n> transponder. I have no experience with FUNcube-3, but your picture looks\n> very much like the noise floor I have seen on FUNcube-1. On overhead\n> passes, it's quiet noticeable, even with only a 3 element yagi.\n>\n> Keep in mind that (usually) a linear transponder is running all the\n> time. It doesn't have to be activated by an uplink signal.\n>\n> In general, AGC action may cause the transponder's noise floor to vary\n> with input signals. One expects that if there are strong signals the\n> transponder's noise floor will become weaker. This behaviour depends on\n> lots of design parameters, so this need not always be the case.\n>\n> 73,\n>\n> Dani EA4GPZ.\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions expressed\n> are solely those of the author, and do not reflect the official views of AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n",
    "attachments": []
}