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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZADQJXQW5OKO6WTNDMPZZBCEIUSGAGAH/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "009501c6cd67$2613b870$b902a8c0@Zeusradioroom",
    "message_id_hash": "ZADQJXQW5OKO6WTNDMPZZBCEIUSGAGAH",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/P7TBNGVHZCELUXSWHNJN6BPG3PK7H2QZ/?format=api",
    "sender": {
        "address": "gouldsmi (a) bellsouth.net",
        "mailman_id": "9f2b000d905c4738ab035c94a0dffa89",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/9f2b000d905c4738ab035c94a0dffa89/emails/?format=api"
    },
    "sender_name": "Gould Smith",
    "subject": "[amsat-bb] Re: ECHO duty cycle",
    "date": "2006-09-01T01:37:11Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/P7TBNGVHZCELUXSWHNJN6BPG3PK7H2QZ/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FRVJUNR3GH2QBKCN6CNNLS6FP6IDUJLU/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6XNEEBEVZ54VP2237VCATYLBN3JYRD4X/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Pat,\n\nThe command team is constantly working on optimizing the Battery \nCharge/Discharge system.  This is the most critical system in a satellite. \nOne of the tricks is to reach your battery discharge depth at the same time \nyou come out of eclipse, a non-trivial task and one that requires a constant \ntweaking process.  Add mode, transmitter and power changes to the mix and it \nbecomes a fine tuning act.\n\nThe team is analyzing and compiling the information from the testing a few \nweeks ago.  The control software is not something that\ngets changed very often due to the extensive effort needed to test it. \nThere is NO simple change.\nAs mentioned many times, we are all volunteers and we need to maximize our \nefforts for the things that effect the health and well being of the \nsatellite.  While there may be a some additional information that people may \nwant published, there is just so much volunteer time in a day/night.\n\nThere may appear to be many 'simple' solutions to power management and \ntransmit power issues, but most of them fall back to changing control \nsoftware which is not a simple solution.  As with any control software, \nadding a feature is usually pretty straight forward, it is the inadvertent \nchange/effect to some other part of the system that causes a problem, often \nmajor.\n\nAO-51 will be in high power mode Sept 4-11.  You may see that more is not \nnecessarily better, the fact that more people can hear the satellite means \nthere is more competition for the satellite.  You may experience more \ndifficulty getting through the satellite.  The BEST advice for any satellite \noperation is to maximize your receive system - i.e.  beam antenna, AZ/EL \nrotor, and preamp.  For LEO operation a small downlink yagi at a fixed \nelevation and AZ rotor will work very well and is inexpensive.\n\n73,\nGould\nWA4SXM\n\n\n\n\n----- Original Message ----- \nFrom: \"McGrane\" <[email protected]>\nTo: \"Amsat BB\" <[email protected]>\nSent: Thursday, August 31, 2006 7:42 PM\nSubject: [amsat-bb] ECHO duty cycle\n\n\n>\n> hello again-\n>\n> Does anyone know what percentage of a day or orbit the echo transmitters\n> are ON?\n>\n> I've been thinking about the battery depth of discharge issue.\n> Being that they are as a whole 4 amp hours, a 10 percent discharge would\n> equate to about 1.6 amps for one quarter of an orbit on-time.\n> According to drew, the transmitters are drawing about .8 amps.\n>\n> I hope people are viewing depth of discharge as a function of amp-hours\n> more than voltage ( I realize also important ).\n>\n> Any comments are welcome.\n>\n> Thanks, pat n2oeq\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\n",
    "attachments": []
}