Well said Jim...and one of the reasons I don't like the mode or any mode or operation that makes that assumption.
This is basically how the old AX.25 skipnet on 20M worked but everyone just gave them the bandwidth and frequency they needed and stayed off if not a part of the net. This is the only way that Pactor III automatic (or even semi-automatic) operation or other similar modes can operate. If we do not desire to give this type of operation an "assigned" frequency and the required bandwidth or if the operator(s) are not willing to accept an "assigned" (coordinated) frequency and bandwidth, then operation of the mode and operation any network will be subject to QRM and will cause QRM. no doubt we need smart modes...high througput, robust and smart operating decisions within the mode and by the operators of the mode or network. 73, Walt/K5YFW -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] Behalf Of jgorman01 Sent: Tuesday, December 12, 2006 9:25 PM To: [email protected] Subject: [digitalradio] Re: New ARRL Petition It's not necessarily the automatic operation that cause the problem, although they certainly can. The biggest problem is that pactor 3 modems are basically designed for commercial use and assume that once they have a 3 kHz channel the whole channel belongs to them for the entire session. The modem can contract and expand it's bandwidth without any worry of causing qrm to adjacent frequencies. This just doesn't work on a shared frequency service like amateur radio. You may chose a frequency well away from a session running along at P2 bandwidth and begin a qso and the other session's modems suddenly decide that propagation will support P3 and widen their bandwidth and cover you up. This occurs without any operator intervention, it is done automatically by the pactor modem's internal software. A real great operational system for the amateur bands isn't it? Jim WA0LYK --- In [email protected], "Danny Douglas" <[EMAIL PROTECTED]> wrote: > > Thats a shame. Its good to see they want to raise the lower limit > for SSB but terrible they want to kept the automatic stations in >there. They just dont have a place on the hambands without some > ability to check for use of the band before blurting in. > > Danny Douglas N7DC > ex WN5QMX ET2US WA5UKR ET3USA > SV0WPP VS6DD N7DC/YV5 G5CTB all > DX 2-6 years each > . > QSL LOTW-buro- direct > As courtesty I upload to eQSL but if you > use that - also pls upload to LOTW > or hard card. > Connect to telnet://cluster.dynalias.org a single node spotting/alert system dedicated to digital and CW QSOs. Yahoo! Groups Links
