From: terhi.victor@logonet.com
Date: Sun Dec 31 2000 - 02:43:53 EET
Tomi Manninen wrote:
>
> On Thu, 28 Dec 2000, Hamish Moffatt wrote:
>
> > On Wed, Dec 27, 2000 at 03:29:11PM +0100, uki@planetmirror.com wrote:
> > > I started playing around with Thomas' new soundmodem implementation, and
> > > saw that it also includes Tomi's newqpsk code.
> > > >From the little information I could find about newqpsk it seems to me
> > > that this mode is not only usefull for HF, but also for VHF and higher.
> > > It seems to me that for a comparable troughtput, less bandwith is
> > > needed. So isn't this a nice replacement for the good old 1200bps mode?
> > > It is narrow enough that it's signal can be fed into the microphone
> > > input of the TX.
> > >
> > > I'm a overlooking something?
> > > Has anybode actually used it on VHF or higher?
> >
> > For 1200 bps, it is simpler to use a cheap TNC or the soundmodem
> > with a cheap VHF FM radio and do AFSK, rather than using a multimode
> > radio (expensive for VHF) and newqpsk.
>
> That is true. But it might be a nice experiment to try newqpsk with an
> FM
> radio. One could potentially get 3000bps or even more through
> mic/speaker
> connectors. On FM the tune preamble could be dropped and the sync
> preamble
> probably shortened. Unfortunately that isn't currently implemented in my
> code but if someone is interested I could do that.
Tomi,
Thrying it with FM is exactly what I have in mind :-)
I'm curious to see what kind of throughput I can get with this mode.
I would appreciate it if you could implement this in the next version.
73, Arno pe1icq
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