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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RMXMTY73OYHMMNNKKUUZCPAI74AFGYPJ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "1361563567.2251.45.camel@tablet",
    "message_id_hash": "RMXMTY73OYHMMNNKKUUZCPAI74AFGYPJ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/VRFMONAE7VKCDCN45KAILTBBMTKNLUR2/?format=api",
    "sender": {
        "address": "w8iss1 (a) gmail.com",
        "mailman_id": "88abc3a1299845fabd8bd92cbab945a4",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/88abc3a1299845fabd8bd92cbab945a4/emails/?format=api"
    },
    "sender_name": "James French",
    "subject": "[amsat-bb] Re: 2.4GHz broadband router on satellite?",
    "date": "2013-02-22T20:06:07Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VRFMONAE7VKCDCN45KAILTBBMTKNLUR2/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/GFI4SY2BXE4HAKNSZRJP65Q4NGTMUM27/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3K2NGP74DTOF3UVZVVAG2K4TJAAF5OFK/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Lee and those who have responded so far,\n\nThose are the questions that would need to be answered before even\nconsidering this 'novel' idea.\n\nI use the WRT54GL as a reference since that is what I am familiar with.\nThe WRT54GL would need to be almost redesigned because of space\nradiation conditions plus it may just not have enough output power to\neven be considered especially with trying to fit it into a microsat or\nsmaller frame and then finding a suitable launch. Could the satellite\nutilize a modified 'backfire' antenna (referencing AO-40 2.4GHz\nantennas) that utilizes dipoles offset from the surface on every side\nand then use the surface of the satellite itself for gain?\n\nAs for HSMM-Mesh, this maybe the software to consider for something like\nthis as its robust enough for what I have played with three WRT54G\naround my area (EN82jg), both mobile and stationary. My laptop (a\nFujitsu Lifebook T4020) is sensitive enough to pick up one 54g half a\nmile away using just the supplied antennas and if I add a BBQ style dish\n(from my AO-40 reception days) to replace the supplied antenna, I can\nalmost quadruple that range. Granted the laptop and 54g are both at\nground level and have a lot of obstructions. Still have to take it out\nto one of the local parks to see what I can actually get for range with\nno buildings. With the laptop being so sensitive, I can connect to the\nlocal McD's free wi-fi almost half a mile away better than I can my\nd-link router in the basement.\n\nAs for frequency usage, going by the 'slide-band' chart (available at\nhttp://www.hsmm-mesh.org), there are 6 available 'channels' that fall in\nthe satellite sub-band the way I am interpreting FCC rules. If the\n'slide-band ' crystal modification is done, that gives 4 'channels' for\nuse. Something to consider there about 'channel' hopping in the\nsoftware.\n\nGreg, KO6TH, brings up about the timing protocols. Maybe the HSMM group\nor TAPR would consider looking at the protocols and maybe modify them\nmuch like AX.25 was done for packet back in the 1980's.\n\n\nMark and Drew bring up about noise levels being unacceptable on a few of\nthe lower bands. This might be mitigated with the use of the\n'slide-band' modification by changing out the 20MHz crystal for a more\nappropriate frequency. As I noted earlier, more about the 'slide-band'\nmod for the 54GL is at the hsmm-mesh pages.\n\nSo if some of these obstacles can be 'overcome', would this be a\n'viable' consideration? Could something like this be utilized to gain\nthe faster input speeds that are wanted for uploading/ downloading\nimages, files, and maybe store and forward systems that could tie into\nthe regional packet networks utilizing JNOS 2.0, WinLink, and FBB.\n \nI just miss having something that is more than just APRS-related on the\nsatellites. This in no way is a knock on the present 1k2 sats, its just\nthat my KPC-9612 has been VERY under-utilized since the mid-1990's and I\nmiss having that fun :(\n\nI am not a rocket scientist, electrical engineer, or a sat designer.\nThese are just personal thoughts to see if this 'idea' is even feasible.\nMy thoughts could be seriously flawed and skewed and totally 'out of\nthis world' to say. For all I know, this might be one of those bright\nideas that would work better with a placement on the lunar surface as\nlong as it doesn't interfere with EME work and can survive the harsh\nenvironment there. That would be a TOTALLY separate discussion in itself\nalone.\n\nJames W8ISS \n=====\nOn Tue, 2013-02-19 at 10:12 -0500, James French wrote:\n> What are the possibilities of building a satellite that uses a Linksys\n> WRT54GL router with a modified DD-wrt or HSMM-Mesh software as a store\n> and forward BBS, to route a received request from one station to another\n> station, or even to connect to a on board networked camera to receive\n> images?\n> \n> What kind of uplink power would be needed from the home station?\n> \n> How fast could the speed(s) get theoretically?\n> \n> How big would the antenna have to be on the craft and for the ground\n> station to even be able to do this adequately?\n> \n> Would the doppler be too much to even consider this?\n> \n> Would the space environment be too harsh for something like this?\n> \n> This is just something I was thinking about this morning and thought I\n> would toss it out.\n> \n> James W8ISS\n\n\n",
    "attachments": []
}