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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/NXUCGL33BQFVGDTSZF7WIECGTCIJJ7PX/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "NXUCGL33BQFVGDTSZF7WIECGTCIJJ7PX",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/NXUCGL33BQFVGDTSZF7WIECGTCIJJ7PX/?format=api",
    "sender": {
        "address": "lucleblanc6 (a) videotron.ca",
        "mailman_id": "9e00802147284c40880480833e06c230",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/9e00802147284c40880480833e06c230/emails/?format=api"
    },
    "sender_name": "Luc Leblanc VE2DWE",
    "subject": "[amsat-bb]  WI-FI already migrating on 5ghz",
    "date": "2006-09-08T02:55:30Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n\nWhat they are telling us about 2.4 and 5GHZ wi-fi system in a few minutes searching. It is not \nrigorously mathematics and statiscally not rigorous but ALL the actual and past commenting forecast \na move towards 5 ghz. Wireless phone at 2.4 are at less that 25$ et some manucturers does not \nproduce them anymore!\n\n\n\n\n\nExcerpt from the internet.\n\nWhen vendors began work on 802.11a, they did not want to stay in the 2.4-GHz range used with \n802.11b products. The spectrum at 2.4 GHz is a shared frequency, so devices like cordless \ntelephones and microwave ovens can create interference problems. Also, the vendors are able to \nsqueeze out only about five channels -- or simultaneous user connections -- in this range, which \nrelies on direct-sequence spread-spectrum technology, a signaling technique that places a premium \non security and reliability while sacrificing efficient use of available bandwidth.\nKeeping to Themselves\n\nIn the late 1990s, the Federal Communications Commission Latest News about Federal Communications \nCommission opened up a new frequency range -- the 5-GHz range -- that is only available for \nwireless LANs, so there is no outside interference. Also, it uses orthogonal frequency division \nmultiplexing for modulation, which increases bandwidth efficiency so an access point can support \nabout 10 simultaneous connections.\n\nBy Paul Korzeniowski\nTechNewsWorld\n01/28/04 5:00 AM PT\n_________________________________________________________________________________\n\nWith multiple formats available, Grewe said it's difficult to predict which technologies customers \nwill demand. Multiband components are complicated, requiring two complete radio systems to send \ndata over either frequency, but the result is a chip that works in any wireless system.\n\nGrewe expects faster wireless networking systems to take off in late 2003. One scenario calls for a \nbroadband connection to a home media hub, which could distribute TV signals, digital audio, gaming \nand other entertainment wirelessly throughout the house.\n\nWith high-definition TV signals requiring nearly 20 Mbps of bandwidth, 802.11b's 11 Mbps won't be \nfast enough.\n\n\"We think home multimedia will be a big application (for faster wireless networking systems), but \nwe don't expect to see that really happen until 2004 or 2005,\" Grewe said.\n\nOne reason: Need for a 54-Mbps wireless connection hardly exists when today's DSL and cable modem \nconnections rarely pull data at speeds faster than 11 Mbps.\n\n\"People tend to forget that faster home networking is going to require faster broadband pipes to \ndeliver content to the home,\" said Kim.\n\nBut 802.11a offers at least one advantage right now: more radio channels.\n\n\"Using more channels is like having more lanes on the freeway,\" said Robert Fan, a representative \nfor Resonext Communications. \"It means 802.11a gives you the capacity to support more users at the \nsame time,\" important on networks in schools, large businesses and public places. \n\nBy Will Wade| Also by this reporter\n02:00 AM Nov, 21, 2002\n\n\n___________________________________________________________________________________\n\nBellanet Sandbox 2004\n\n\nHigher frequency 5GHz band seems to be a more promising platform for deploying higher speed 54Mbps \nand up WiFi infrastructure. WiFi equipment in this band incorporates two additional features into \nthe IEEE 802.11a standard (WiFi standard), namely, dynamic channel selection and transmit power \ncontrol. Dynamic channel selection improves the ability to coexist with other user of the 5GHz \nbands as devices may select channels based on real-time feedback. Transmit power control is used in \nselecting lower-powered channel for short-range applications or higher-powered channel for long-\nrange applications.\n\nAlthough, 5GHz band deployment has not been reviewed in this book. The deployment method is fairly \nsimilar to the 2.4GHz band. Quite a bit of 5GHz implementation has been done in the developing \ncountries. Some use it as the long-haul backbone infrastructure. In dense area, some use 5GHz WiFi \ninfrastructure for last mile access infrastructure.\n_________________________________________________________________________________\n\nby Lisa Phifer, VP, Core Competence\n20 Feb 2003\n\nAlthough 802.11a is by no means immune to interference, it's likely to encounter less interference \nsimply because of the 5 GHz frequencies on which it broadcasts. The reason? The 5 GHz band is \nshared by far fewer devices than the 2.4 GHz band used by 802.11b/g.\n\n_________________________________________________________________________________\n\n\nWhy AMSAT should be always 180 degres off phase with the real world...They are not  only want us \nbelieve they scarp S mode only for technical reasons. If they work in a so close relation with \nAMSAT-DL folks why they don't convince them to scrap their S band in a way to avoid them costly and \nfatal errors?\n\n\n\n\n\n\n\n \n\n\n\"-\"\nThe medium is the message...The content is the audience...;)\n\nLuc Leblanc VE2DWE\nSkype VE2DWE\nwww.qsl.net/ve2dwe \n",
    "attachments": []
}