SCAMP and PSKMail make it clear that a PC and soundcard can reliably
deliver messages over HF even with the "wrong" operating system. The
trick is to choose an error detection and correction mechanism that
is compatible with the operating environment.
Pactor-2 and Pactor-3 chose an error detection and correction
mechanism appropriate for their operating environment, which is a
processor dedicated to running a single application (their modem).
The fact that these protocols can't be implemented on a PC running
Windows cannot be generalized to "protocols that use ARQ can't be
implemented in software running on a computer".
A mode that requires its users to augment a desktop PC and soundcard
with additional hardware, e.g. a dedicated DSP, will experience
limited adoption. To overcome the inertia, such a mode would need
almost magical properties; most hams would spend $300 for a dedicated
box that would make them telepathic or telekinetic, but anything less
than that and you're in SCS's "low adoption" territory.
In contrast, an exciting new mode that runs on a PC and soundcard
would be tried by nearly every ham with a computer.
73,
Dave, AA6YQ
--- In [email protected], "DuBose Walt Civ AETC CONS/LGCA"
<[EMAIL PROTECTED]> wrote:
>
> John,
>
> You wrote..."Bottom line - there is *NO* computer running software
with out
> any hardware (TNC) that will do the same right?"
>
> Wrong I think. With the right operating system, running on the
right/correctly configured computer (hardware) and with the right
software, you can do what Pactor II/III or almost any other mode used
can do.
>
> What needs to be evaluated is whether it is better to run a
separate computer, separate DSP boards, more than one DSP chip, more
than one processor (dual processors...dual core dual processors),
RISC processor, go to 64 bit processor, etc.
>
> The "computer industry" is full of COTS hardware and if we (hams)
can incorporate it into our computers to developed and implement
superior communications modes, then I believe we should rather and
develop peripheral hardware for new modes.
>
> Walt/K5YFW
>
> -----Original Message-----
> From: [email protected]
[mailto:[EMAIL PROTECTED]
> Sent: Thursday, September 14, 2006 9:58 PM
> To: [email protected]
> Subject: Re: [digitalradio] Re: ARQ sound card modes
>
>
> I knew that.
> So is my AEA TNC that I got back in 1988....
>
> Bottom line - there is *NO* computer running software with out
> any hardware (TNC) that will do the same right?
>
>
>
> At 09:45 PM 9/14/2006, you wrote:
>
> >>>>Yes. Open up your P 2 & 3 TNC, and you will find a
microprocessor.
> >That microprocessor is running software.
> >
> > 73,
> >
> > Dave, AA6YQ
> >
> >
> >
> >
> >
> >
> >Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org
> >
> >Other areas of interest:
> >
> >The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/
> >DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy
discussion)
> >
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>
>
>
> Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org
>
> Other areas of interest:
>
> The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/
> DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy
discussion)
>
>
> Yahoo! Groups Links
>
Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org
Other areas of interest:
The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/
DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion)
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