Im considering buying a Whistler TRX-2 Base/Mobile DMR Capable Digital Scanner and trying to do a little research on it first. First off, do I need a computer in order for this unit to work? or is the pc basically used for upgrading the updates,firmware,ect? Also after viewing a few videos on youtube, it appears to have a slow scan speed,so Im wondering how many channels scanned in X amount of time, or if there is a turbo scan function on it? I have also seen mention of having a sd card reader on the computer, is this a necessity? Another thing im wondering is, would I be able to lockout certain talkgroups, and or prioritize a certain talkgroup? i would primarily be using this scanner for analog/digital (trunking). I know this is alot of questions, and probably find the answers, but really dont want to spend hours looking for them online. Any help would be grateful , thanks in advance.