Channel numbers and EDACS rebanding
Newsalan is correct, the FCC channel numbers are defined in the FCC regs and are not a Motorola invention. You can see the section 90.613 here -> http://tinyurl.com/y4psj3 . The channel numbers have always been around and the various frequency pools (public safety, SMR, I/LT, etc...) were all originally defined as groups of channel numbers.
Since EDACS radios are programmed with the actual frequencies in MHz and the control channel uses LCNs, most newer EDACS radios don't have an issue with rebanding. Older EDACS radios however, due to firmware limitations, cannot not be programmed on 12.5 kHz steps outside of the current NPSPAC band. In the lower part of the 800 MHz LMR band, you only get the channels that are on 25 kHz centers. So when the NPSPAC band moves down to the 851-854 range, agencies on NPSPAC channels that have older mobiles and portables will have to upgrade because their radios won't take their new frequencies. Agencies on the old General Category and "interleaved" channels should be able to use older EDACS radios on new non-NPSPAC channels just fine, but will probably still want new radios so they can operate on the NPSPAC ITAC channels at their new home at the lower end of the band.
--z
newsalan said:Yes. The new NPSPAC channels numbers will be 1-230. See new rule Sections 90.16 and 90.613 in the Order. "
Newsalan is correct, the FCC channel numbers are defined in the FCC regs and are not a Motorola invention. You can see the section 90.613 here -> http://tinyurl.com/y4psj3 . The channel numbers have always been around and the various frequency pools (public safety, SMR, I/LT, etc...) were all originally defined as groups of channel numbers.
Since EDACS radios are programmed with the actual frequencies in MHz and the control channel uses LCNs, most newer EDACS radios don't have an issue with rebanding. Older EDACS radios however, due to firmware limitations, cannot not be programmed on 12.5 kHz steps outside of the current NPSPAC band. In the lower part of the 800 MHz LMR band, you only get the channels that are on 25 kHz centers. So when the NPSPAC band moves down to the 851-854 range, agencies on NPSPAC channels that have older mobiles and portables will have to upgrade because their radios won't take their new frequencies. Agencies on the old General Category and "interleaved" channels should be able to use older EDACS radios on new non-NPSPAC channels just fine, but will probably still want new radios so they can operate on the NPSPAC ITAC channels at their new home at the lower end of the band.
--z