Except pactor 3 modems, in essence, choose the operating bandwidth in an "unattended" fashion. Even in a keyboard to keyboard conversation, a pactor 3 modem can vary its bandwidth based upon the signal strength and do so without operator intervention. This means you might spend 15 minutes at 500 Hz in a keyboard to keyboard conversation and have other operators begin conversations near you. Then the modems can suddenly expand to the full 2.4 kHz bandwidth without your intervention and cause harmful interference to the signals near yours.
So in essence, pactor 3 modems choose their bandwidth in an "unattended" fashion regardless of the type of operation. They were designed to do this because they were designed for commercial operation where once you "seize" a 3 kHz channel the entire channel is yours for the duration of the connection. This IS NOT how the amateur bands work! Jim WA0LYK --- In digitalradio@yahoogroups.com, "Rud Merriam" <[EMAIL PROTECTED]> wrote: > > My only criticism is you are lumping a tool, PACTOR, into a procedure > discussion. PACTOR is a tool that has nothing to do with unattended > operation, except it is used in unattended operation. > > Rud Merriam K5RUD > ARES AEC Montgomery County, TX > http://TheHamNetwork.net <http://thehamnetwork.net/> > > -----Original Message----- > From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On > Behalf Of Andrew O'Brien > Sent: Sunday, September 23, 2007 3:48 AM > To: digitalradio@yahoogroups.com > Subject: [digitalradio] FCC and the unattended ALE/PACTOR lepers > > > Consider the following statements attributed to Hollingworth and the FCC's > Cross. > > > I have always thought that a "QRL?" was the cornerstone of good operating > practice and the effective operator changes frequency when the answer "yes" > is heard. I think installing busy detection capabilities would be "the > right thing to do" but I wonder if both Cross and Hollingsworth would > expect us to "tolerate" the DX beacons, PACTOR mailboxes, and ALE soundings > ? If so, lets get on with a common sense approach to sharing the world of > attended and unattended operations. If not, lets get a ruling and stop ALE > , PACTOR, DX beacons, and ARRL beacons until they routinely QRL and actually > change frequency when met with a "yes". > > Maybe it is time to drop his office a line and ask for a clarification. To > be honest, I love to see the reaction if the response was that the FCC does > not really care and you guys should just figure it out among yourselves. > > Andy K3UK > <file:///C:/DOCUME%7E1/NEWUSE%7E1/LOCALS%7E1/Temp/moz-screenshot-5.jpg> >
