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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VS745NWJCY3EI52CW6TN5M2U3KDPYOLW/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "VS745NWJCY3EI52CW6TN5M2U3KDPYOLW",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FEBDCQJ3PAKZ6UFGO4JPZNHRAZYXDDMR/?format=api",
    "sender": {
        "address": "aa2bn (a) comcast.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "John Zaruba Jr",
    "subject": "[amsat-bb] Re: S band downlink on P3E",
    "date": "2006-09-07T23:27:00Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/H7ROKTNB6K4UVI4MRMA55ZKACTWQHVJQ/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "While I'm also disappointed in the lack of a 2.4 GHz downlink, I  \nthink the rational laid out in the latest AMSAT Journal presents a  \nreasonable analysis of the situation.\n\nThe few weeks I was able to use my S Band equipment (K5GNA  \ndownconverter + 60 cm dish + K3TZ design patch feed) AO40 never  \nrendered what I would refer to as an ear drum popping signal, the  \nbest I ever achieved was around an S5.\n\nNow, let me provide the disclaimer that I am not an engineer nor  \nrocket scientist, but assuming the 17db increased noise floor  \nreference in the Eagle Update article is correct, and the general  \nconvention that receiver S units are about 5 db, I believe that the  \nbest case signal I would hear at my location would be around an S2.  \nNow from experience I've found that the best case signal represents a  \nonly a small part of the total pass visibility.\n\nI also believe that it would be impractical to increase the  \nsatellite's transmitter output to make up for the increased  \nterrestrial noise floor, given the power generation and payload  \nconstraints of the proposed Eagle design.\n\nSince we (speaking as an AMSAT member) build very capable satellites  \non a shoe string budget (compared to commercial operators) I feel  \nthat every opportunity to advance the communications and aerospace  \nstate of the art must be taken, in view of the fact that launch  \nvehicle availability is extremely limited for non-professional  \norganizations. To my mind, the design team are making the best  \nengineering decisions they can.\n\n73,\n\nJohn AA2BN\nAMSAT 22683 \n",
    "attachments": []
}