skipp025 wrote: >> "Jim B." <[EMAIL PROTECTED]> wrote: >> Well, I know EDACS is around 100-150 mS, where LTR is >> typically 300-500mS. The baud rate, and amount of data, are >> the main factors in limiting access time. > > You are right on the money, but LTR is 40 bits of 300 baud > data that is right about 350mS typical to be on the air. The > customer is not going to notice a difference of say .150mS > typical... especially when you/we/they have the typical go-head > tone sequence distraction in their face for the time it takes > the repeater to aquire.
I swear LTR was much slower, just a little faster then DPL. More like 150 baud??? Anyway, right, for a typical commercial LMR customer, they aren't likely to be too upset at the difference, but public safety/first responders don't like the "slow" times of a normal CTCSS decoder :c/ It takes a long time for them to get used to any trunked system if they've been conventional. They also have a hard time with the delays involved with digital audio vs. analog... > But what they do clearly notice is the nearly +6dB price of an > Edacs radio vs an LTR format radio. Yeah...I think MPT radios typically run in between somewhere as I remember. >> You'll also find the older motorola formats, and others, that >> use a slow baud rate, will have longer channel grants. LTR is >> a VERY slooooow baud rate, but not as much data is sent, which >> partially makes up for it. > > Yep, again reference my above baud rate and data values. Everything > is a trade. If we step back and look at the larger picture the > question is if the various trades are worth the cost? Each person > has to make his or her own choice. Indeed! >> Motorola formats used to be 3600 baud (or lower), where EDACS >> and P25 are 9600. I'm pretty sure MPT is 9600 as well. >> Jim Barbour >> WD8CHL > > Faster baud rate is nice but much of the private ltr LMR industry > doesn't want to pay non generic price tag for equipment when the > difference in channel aquire time is around 150mS. Not to mention > you might get locked into only one brand/mfgr of equipment paying > what they want you to pay. Well, that is *supposed* to be the idea behind both MPT and P-25...open architecture...but it'll take time for P-25 to come down in price. > It's great these details get out into the public eye... information > is the best resource. > > cheers, > skipp > Very definitely!!! -- Jim Barbour WD8CHL
