The FCC is re-thinking the move to 6.25 KHz based on the fact that narrow band systems (and I have done a few of them) lose about 30% of the existing coverage AND the NEW FCC believes that broadband is what it is all about in the future-no matter that broadband cannot do simplex or any of the other stuff needed for LMR and public safety.
And like a few others have said on here-you have to narrowband but are NOT required to move to digital-P25 or anything else, I have just completed several systems which use analog and we have moved them from Wide to Narrow with no problems-EXCEPT the coverage problems I mentioned. Andy W6AMS (and btw there are professional LMR folks and consultants who work with this stuff every day on this list, just because we are hams too does not mean that we are not in the business as well) From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Bill Smith Sent: Friday, August 27, 2010 12:47 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Seeking emergency system design help 1) There is NO requirement to go digital 2) There is NO requirement to go 6.25 KHz. Yet. You can safely install an analog 12.5 KHz system and expect many years of use from it. By the time 6.25 has a firm use by date, you'll be looking to replace the current system anyway. Of course, you CAN use something like MotoTRBO or NexEdge f you don't mind paying a bit more. If this is truly an emergency type system, then you need professional design help, not just from this list. Bill KB1MGH ________________________________ From: n5qs <ygr...@white-tiger.org> To: Repeater-Builder@yahoogroups.com Sent: Fri, August 27, 2010 2:11:49 PM Subject: [Repeater-Builder] Re: Seeking emergency system design help Chuck Please abandon the idea of using D-Star equipment modified for non amateur use. First this is ILLEGAL. 2nd there is no commercial equipment that I am aware of that is compatible without modification. I would suggest using Kenwood Nextedge technology. This is very similar in performance to the D-Star and has a bandwidth of 6.25 KHz on a simplex radio (Mototurbo can not operate at 6.25 KHz without infrastructure) The FCC has already stated that the 6.25 KHz bandwidth is coming they just don't give any date prediction and I would not design a NEW system that did not comply directly with the ability to use this bandwidth. This is probably the most stable technology in todays market that can be set up with off the shelf equipment. I am too far away to help but would be glad to advise any legal way that I can. Roger --- In Repeater-Builder@yahoogroups.com, "Chuck Kelsey" <wb2...@...> wrote: > > I doubt that the D-Star amateur equipment (or any amateur equipment) is > type-accepted for where you intend to use them. > > Chuck > WB2EDV > > > ----- Original Message ----- > From: "rudy_n2wq" <r_baka...@...> > To: <Repeater-Builder@yahoogroups.com> > Sent: Thursday, August 26, 2010 1:08 PM > Subject: [Repeater-Builder] Seeking emergency system design help > > > > Hello, > > > > I am looking for some advice or even a systems integrator who can help me > > design and implement an emergency communication system for my employer, > > using an off-the-shelf repeater and radios. > > > > My current thinking is to use D-Star radios and a D-star repeater, > > modified to work on non-amateur frequencies. Since the radios will be in > > Manhattan, the idea is to place the repeater in our Newark, NJ office and > > use directional antennas for the repeater. We are trying to prepare for > > the possibility of the entire building being damaged and thus the idea to > > move the repeater across the river. > > > > 73, Rudy N2WQ > ------------------------------------ Yahoo! Groups Links
