Re: [Announce] New AX.25 release and signoff from maintenance

From: John Ackermann N8UR (uqdkmhxp.lrmx@lapl.org)
Date: Fri Nov 16 2001 - 21:42:45 EET

  • Next message: Nick Papadonis: "Re: [Announce] New AX.25 release and signoff from maintenance"

    --On Friday, November 16, 2001 8:25 PM +0100 Sandor Dibuz
    <hfaq.ywid@schering.de> wrote:

    > On Fri, 16 Nov 2001, John Ackermann N8UR wrote:
    >
    >> Just a quick followup re the status of the TAPR radio project ...
    >
    > Not meant to be offending in any way, but does it still have a sense to
    > design and build such a radio? 2.4Gigs FHSS cards are available second
    > hand for less than 30 bux.
    >
    >
    > 73... Sanyi

    Good question. The idea behind the TAPR radio is a bit different than the
    802.11b stuff. First, although the original design is for an RF board at
    900 MHz that is compatible with US "Part 15" unlicensed operation, there's
    no reason a different RF board couldn't be designed to operate on other ham
    bands with higher power. So it's a potentially more flexible design.

    Second, and more important, the RF performance of this radio is way beyond
    that of PCM cards that are intended for use in a LAN. The front end is
    designed to be very robust, and the modulation scheme includes forward
    error correction and other tricks. The design goal is 128kbps+ throughput
    after FEC over a roughly 30 mile line-of-sight path. If the path is clean
    enough to allow the FEC to be turned down, the throughput can be quite a
    bit higher (the raw bit rate is 768kbps).

    Finally, the networking protocol is designed with radio "stacking" and
    point-to-multipoint operations in mind, so it can serve as the basis for a
    metro-area LAN as well as point-to-point operation.

    This radio won't replace your 802.11b card, but will make metro area
    networks and longer-haul point-to-point links possible, or at least much
    easier.

    73,
    John 

    ----
John Ackermann    N8UR         ganfjpy@unipr.it     http://www.febo.com
President, TAPR                afstweyt.thqevs@sapuri.co.jp    http://www.tapr.org

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