Bob N4HY, could you elaborate on the difficulties you encountered
when trying to implement Pactor?
73,
Dave, AA6YQ
--- In [email protected], Robert McGwier <[EMAIL PROTECTED]>
wrote:
>
> Dave:
>
> The technical specification is incomplete. You may not take their
> documents and implement a compatible system (been there, done
> that, got the tire tracks on my back). They have not made these
> specifications public to my knowledge anywhere, including the
> F.C.C. As such, I do not see why it is not an illegal scrambler
> in the U.S.
>
> Bob
> N4HY
>
>
> Dave Bernstein wrote:
> > I don't think the problem lies with SCS, Doc. First, they have
> > provided descriptions of the Pactor 2 and Pactor 3 protocols;
> > the absence of alternate implementations is more likely the
> > result of constraints imposed by Windows than technical
> > obfuscation by SCS.
> > Second, Pactor 2 and Pactor 3 in keyboard-to-keyboard mode are,
> > from a QRM-generating perspective, no different than RTTY or
> > AMTOR -- there are operators on both ends listening to the
> > frequency, so QRMing an ongoing QSO is unlikely.
> >
> > The problem is semi-automatic operation without busy frequency
> > detection. This results in QRM to ongoing QSOs, and there's no
> > way to communicate with the station generating the QRM even if
> > you happen to have the right modem because the guilty station is
> > automaticly controlled! This is the case with semi-automatic
> > operation in CW, RTTY, or PSK -- the fact that Pactor 2 or
> > Pactor 3 are being used by many message passing services
> > (because they are fast and error-free) is actually irrelevant.
> >
> > Enforcement would certainly be easier if we could eliminate the
> > need to decode every protocol out there. Requiring the
> > participants of each digital mode QSO -- whether attended, semi-
> > automatic, or automatic -- to periodically identify in a common,
> > easily-decoded modulation and format would greatly facilitate
> > self-policing.
> >
> > 73,
> >
> > Dave, AA6YQ
> >
> >
> >
>
>
> --
> AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
> NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
> Laziness is the number one inspiration for ingenuity. Guilty as
> charged!
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