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Re: [Q15X25] Re: Ahoy!

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  • David Ranch
    I d like to give this mode a try via Linux s soundmodem if anyone is up for it. The QTH here is the Bay Area, CA with a modest fan dipole @ 50w. Anyone
    Message 1 of 4 , Jul 1 10:01 PM
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      I'd like to give this mode a try via Linux's soundmodem if
      anyone is up for it. The QTH here is the Bay Area, CA with a modest fan dipole @ 50w.

      Anyone interested?

      --David



      On 07/01/2012 06:24 PM, Charles Brabham wrote:
      >
      > I have used it as a QSO mode on HF, and have done file transfers on
      > VHF with it. The folks who first experimented with Q15x25 were
      > swapping image files on 15 meters, if memory serves.
      >
      > Using MixW's virtual KISS mode, I used it as a Q15x25 KISS TNC for a
      > bulletin board program. Some experiments were done by a the SkipNet
      > Packet BBS forwarding group on 17 meters with Q15x25, where we found
      > that it was just not robust enough, did not handle noise or
      > interference well. In some situations, the 300 baud Packet was faster,
      > and it consistently would link up when Q15x25 would not.
      >
      > I think that if we had scaled the modem down to the minimum 1000 baud,
      > with less PSK streams that it might have worked out better on HF...
      > The modem is scalable and could easily be adjusted, but I never could
      > organise a second test.
      >
      > I had my best success with Q15x25 on VHF, over the repeater system by
      > using a full one second TXDelay.
      >
      > Also, Flex32's soundmodem driver is the same modem but on its modem
      > list, it is called NewQPSK. - Same dll - if I understand correctly.
      >
      > I used Flex32's digi function to create a 1.2kb Packet - Q15x25 mode
      > gateway that worked quite well.
      >
      > I regret that 10 streams was the minimum, as it seems to me that a
      > four or perhaps five stream modem would be much more robust.
      >
      > 73 DE Charles, N5PVL
      >
      > .
      > ----- Original Message -----
      > From: James Foley
      > To: Q15X25@yahoogroups.com <mailto:Q15X25%40yahoogroups.com>
      > Sent: Tuesday, June 19, 2012 3:55 PM
      > Subject: [Q15X25] Re: Ahoy!
      >
      > Hi Charles... I just joined this group. While poking around I found
      > references to a Q15X25 mode and have installed it in my MixW. Now I am
      > looking around for someone to try to use it with. I guess I will have
      > to do some data mining here to locate frequencies. I am wondering if
      > this is a qso mode or do they just use it to transfer files and email
      > and such?
      >
      > 73 de w8nsi/nnn0uzw jim
      >
      > --- In Q15X25@yahoogroups.com <mailto:Q15X25%40yahoogroups.com>,
      > "Charles" <n5pvl@...> wrote:
      > >
      > > Anybody still around?
      > >
      > > What's up? How are you doing?
      > >
      > > 73 DE Charles, N5PVL
      > >
      >
      > [Non-text portions of this message have been removed]
      >
      >


      [Non-text portions of this message have been removed]
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