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.
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]