Re: Packet at the physical level

From: Mike Davies (ujfhemky.lsbrh@relay.tunkki.fi)
Date: Fri Sep 19 2003 - 10:10:50 EEST

  • Next message: Richard Stearn: "Re: Packet at the physical level"

            Thanks for all the replies (so far). A little bit of fiddling here
    has confirmed that valid packets can start with either tone. You learn
    something every day.

            By the way, VHF amateur packet is not Bell202 compatible. I've
    seen this mentioned before, but I've got the source code for a Bell202
    modem which I know works, and that simply uses a 1300Hz tone for high bit
    and a 2100Hz tone for a low bit. So not only does it use different tones
    it doesn't do the NRZ modulation.

            Hopefully in the next day or two I'll be able to transmit a few
    test packets, and then I'll be able to determine the CRC polynomial if
    nothing turns up before.

    Mike
    -
    To unsubscribe from this list: send the line "unsubscribe linux-hams" in
    the body of a message to reqgaxdy@terranet.fr
    More majordomo info at http://vger.kernel.org/majordomo-info.html

    This archive was generated by hypermail 2b30 : Fri Sep 19 2003 - 10:09:50 EEST