Dear sirs, Thank very much for the information. Yes, it is difficult to say which one will better than other. For me/my team we get intend to know more on it before start the project. I heard a story that some where police digital radio system use TDMA format. Syetem Planed <1,xxx sites for "full" out door coverage . As the result it is double the site. They tried to increase the R.F power output. The field strength increase ,but only a bit change. It is because the TDMA format time slot overlap by distance multi path. Increased R.F Power seems result a lot of side band noise up to Ham Band, hi hi!
Back to the Ham digital voice repeater ,due mode is a must . So D-star seems not matchat the moment, but its setup cost within our target. Second hand Mototrbo also meet the budget.But it is TDMA format. P25 cost a lot & no ham use here. The above a my personal point of views ,we intend to find out / select and paln the next project. Digital Ham Repeater . Any suggestion & comment are welcomes. VY73 de VR2XVD/W.L.Ho 7 Apr.10 On Wed, Apr 7, 2010 at 12:41 AM, nj902 <wb0...@arrl.net> wrote: > > > In fact there are defined tests for real world performance of the various > formats [with the exception of the amateur D-Star format] > > The commercial land mobile industry has great interest in understanding the > operational characteristics of all of the current and emerging formats and > protocols, including how each performs in the real world - on its own and > while sharing the spectrum with other systems of the same or different > formats. > > Consequently, for a number of years, the TIA [Telecommunications Industry > Association] has had a working group studying the technology and developing > standards and industry guidance documentation. > > For an overview of these TIA documents, do a Google search for: > "W09-olson.ppt" > > ---------------------------------------------------------- > > --- In Repeater-Builder@yahoogroups.com<Repeater-Builder%40yahoogroups.com>, > Nate Duehr <n...@...> wrote: > ... > "... You will be spending a lot of time field testing to find out. There's > no standard tests available for anything further than signal strength. ..." > > > -- HKARA website : http://www.hkara.org.hk VR2XVD email : vr2...@yahoo.com,vr2...@gmail.com Please consider the environment before printing the email.
