James Delancy wrote: > I have found that most radios made since the late 90's in the public > safety world are capable (some earlier ones could not handle 2.5 KHz > channel steps)
The FCC mandated that manufacturers MUST include a 12.5 KHz bandwidth mode in all Part 90 radios starting in....was 1995 or 1996? something like that. So yes, anything accepted for Part 90 has had it for at least 13 years or more. Channel steps has nothing to do with narrowband capability, however. It's just that on VHF high band, the existing channels are 15 KHZ spacing, so to cut that in half, you get 7.5, and that needs a 2.5 divisor, 5 won't work.
