That loss is likely due to the switch to digital which is required for 6.25 kHz bandwidth, and not a function of the bandwidth itself.
Joe M. Andrew Seybold wrote: > > > 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 cover age 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:* [email protected] > [mailto:[email protected]] *On Behalf Of *Bill Smith > *Sent:* Friday, August 27, 2010 12:47 PM > *To:* [email protected] > *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 <[email protected]> > *To:* [email protected] > *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. > < br>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 [email protected] > <mailto:[email protected]>, "Chuck Kelsey" <wb2...@... > <mailto: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...@... <mailto:r_baka...@...>> >> To: <[email protected] > <mailto:[email protected]>> >> 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 a ntennas 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 > > > [email protected] > <mailto:[email protected]> > > > > > ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> 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/
