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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MJHLQFO27ZLQG2PC3AXHQMOHW5BS7Y5C/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "3CE136718CF34297A4323B32D4D38D59@Laptop1520",
    "message_id_hash": "MJHLQFO27ZLQG2PC3AXHQMOHW5BS7Y5C",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/XOOH75J3GM5T4YWD4FR4T4IZGKZCPMQG/?format=api",
    "sender": {
        "address": "vk4tec (a) tech-software.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Andrew Rich",
    "subject": "[amsat-bb] Re: All Satellites",
    "date": "2009-09-28T10:29:05Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XOOH75J3GM5T4YWD4FR4T4IZGKZCPMQG/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\nI am playing with RF modules that take ms to send not seconds\n\n19k2\n\nLPRS\n\n\n----------------------------------------------------------\nAndrew Rich\nAirways Technical Officer Grade 4\nSurveillance - RADAR ADS-B\nAmateur Radio Callsign VK4TEC\nemail: [email protected]\nweb: www.tech-software.net\n----- Original Message ----- \nFrom: \"William Leijenaar\" <[email protected]>\nTo: <[email protected]>\nSent: Monday, September 28, 2009 8:04 PM\nSubject: [amsat-bb] Re: All Satellites\n\n\nHello AMSATs,\n\nI agree that APRS can have a higher power transmittter, because of its small \namount of time to get the data broadcasted. However the workability with the \nHT and whipe antenna is only an advantage for the downlink. For the uplink \nthere will be no advantage.\n\nPersonally I believe that making a satellite easier accessable will also \ndecrease its functional efficiency. This is especially the case for \nsatellites with limited user access, like single channel FM satellites. This \nalso includes APRS. The same issue is valide for a geostationary satellite, \nwith the addition that a geostationary satellite would be overloaded in \nshort time by more and more stronger stations as fixed antennas can be used. \nOnly the uplink power level would be the parameter of \"competition\". \nResulting in a privat chat satellite for only few (high power) users.\n\nSatellites for emergency communication sounds very interresting, and \npersonally I believe it can give a great advantage when doing it well. The \nquestion is only what will work well in an emergency situation. It will \ndepend on the needs and the availability of equipment in the effected area. \nI believe that digital communication will be of limited use as you need also \na computer, modem, keyboard, screen, software etc besides your radio. Only \none thing missing and you will not be \"heared\". I don't say it is \nimpossible, but to make the system work the ground stations need to be made \nmore easier somehow. Maybe HT APRS in combination with voice to text \nconversion (and opposite) would be an idea ?\n\nBesides the technical difficulty there is also the (human) organising \nfactor. I heared some ideas about an easy to access geostationary satellite \nwith high power downlink. That would be great, but without any communication \ncontrol it would be like the FM LEOs where everyone talks at the same time \nand nobody is able to get there message through.\nIt might be solved with a central control centre on a safe place (maybe by \nthe Amateur Radio Emergency Service ?) that has control over the satellite \nradio and uses it as a remote radio \"ear\" in space. In this way it is also \npossible to use one frequency simplex system.\n\nJust some ideas,\n\n73 de PE1RAH,\nWilliam Leijenaar\n---\n\n\n\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n\n--------------------------------------------------------------------------------\n\n\n\nNo virus found in this incoming message.\nChecked by AVG - www.avg.com\nVersion: 8.5.409 / Virus Database: 270.13.113/2399 - Release Date: 09/27/09 \n17:52:00\n\n",
    "attachments": []
}