On Uniden scanners when the modulation of a channel is specified as “Auto” the scanner will do its best job to demodulate it with everything its got. However, if the Modulation is set to something specific, it will only recognize that channel if the modulation matches. If the channel is set to DMR, it'll only match when a DMR signals comes through. If the channel is set to Analog however, it'll match everything but only pass the FM audio. So if a digital voice mode, like DMR, is received, the channel will open up but just play you the “hammer” FM sound of the DMR signal.

This same behavior extends to Systems. If the System type is specified as something other than Conventional, It must match.

I've been scanning a system that used to be a conventional analog system. They have since upgraded to a DMR network. The conventional system( assuming modulation is set to auto ) will still scan it just fine, show that its DMR, and even expose the TGID & CC to the user and software( Ex: ProScan ). However, when you try to program a specific DMR System for it. You must have all the parameters just right or it won't work .

A similar system in the area changed from conventional to MotoTRBO Capacity +, Single frequency. The new system has to be programed as MotoTRBO Trunk instead of DMR One Site to get the scanner to recognize it.

#Uniden #Scanning #Radio #DMR