I can't tell where you are coming from by your comments. Today's FCC regulations don't keep you from using a bandwidth wider than 3 kHz on HF. The proposed ARRL petition will keep you from using one wider than 3.5 kHz. Specifically, which regulations are you worried about?
There ARE two problems you will encounter with wider bandwidths. Other than the very latest high end transcievers, most current (+95%) SSB transmitters use a crystal filter with nominal bandwidths of 2.4 to 2.8 kHz. No way to get around it without expensive modifications. Therefore, its the equipment, not regulation that mostly defines the 3 kHz. The second problem you have to meet with DV is the spectrum (3 kHz), technical, and economic efficiency of SSB. Someone correct me if I am wrong, but the phone bands appear to be pretty crowded with 3 kHz SSB signals. Why would the community embrace anything wider which reduces the number of qso's you can have in a given segment? There is also nothing from keeping you from using the higher bands to develop your DV implementation at wider bandwidths, then moving it down. Are you trying to make an argument that current regulations are too restrictive or the ARRL proposed ones? Jim WA0LYK --- In digitalradio@yahoogroups.com, "Peter G. Viscarola" <[EMAIL PROTECTED]> wrote: > > > > > >try this page for the AOR digital modem at > >that most on digital voice are using. > > > > Thanks. That's helpful. Like I said, this happens to be an area in > which I'm particularly interested. > > Actually, I'm aware of the G4GUO's work. Is there a group or a website > that discusses people's real-world experience with this protocol? I was > under the impression that it needed a pretty high signal to noise ration > to make it work well. > > I'm also aware of ANDVT. > > So, yes, you're quite right: There ARE at least two examples of digital > voice in 3KHz on HF. > > As I didn't state my original point well, let me try again: Doing > digital voice on HF in 3KHz bandwidth is tough. Forcing us to START > experimenting with digital voice on HF in a 3KHz restricted bandwidth is > a pretty steep wall to climb. Sort of like starting out learning how to > walk by running. > > I personally have no HF digital experience. But I know a bit about both > data compression and digital communications protocols. As a > software/firmware guy, I think this area has a lot of promise if it's > not stifled by overly restrictive regulation. > > de K1PGV > 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 <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
