But commercial systems (NXDN) with mobiles, handhelds and repeaters that use 6.25 kHz channel spacing have been available for years - both Icom and Kenwood are active promoters of the system which uses a far more efficeint modulation techique that D-Star, see
2005 - Icom and Kenwood demo 'Very Narrowband Digital Communications Technology' http://www.southgatearc.org/news/apr2005/icom_kenwood_demo.htm 2008 - The Gadget Show tests digital and analog walkie talkies http://www.southgatearc.org/news/november2008/gadget_show_radio_tests.htm 73 Trevor M5AKA --- On Fri, 2/10/09, Charles Scott <csc...@gaslightmedia.com> wrote: > From: Charles Scott <csc...@gaslightmedia.com> > Subject: Re: [DSTAR_DIGITAL] Re: ARRL Approves Study Committee to Research & > Develop Plan for Narrowband Chan > To: dstar_digital@yahoogroups.com > Date: Friday, 2 October, 2009, 6:50 PM > Bosshardss: > > And of course many more recent repeaters can be configured > for > narrow-band analog service. There's no reason someone > couldn't simply > decide to take a repeater narrow and there's plenty of Hams > now with > radios that can do this as well. > > Chuck - N8DNX > > bosshardss wrote: > > P25 and DSTAR are naturals for cutting > bandwidth. DSTAR is -26db @ +/-3 Khz, there abouts > (going from memory) and the mask is similar to P25. > Some of the new commercial designs will be either 6.25 or 2 > talk paths in 12.5 (sharing a system/frequency - isn't that > a novel idea?). > > > > --- In dstar_digital@yahoogroups.com, > Mark Thompson <wb9qzb_gro...@...> wrote: > > > > > > > ------------------------------------ > > Please TRIM your replies or set your email program not to > include the original message in reply unless needed > for clarity. ThanksYahoo! Groups Links > > > mailto:dstar_digital-fullfeatu...@yahoogroups.com > > >
