I'm looking at many local in Phoenix, Arizona. But in particular, I am looking at SHAWBUTE 725, it appears to be a good choice from my newbie perspective. However, in particular, this one confuses me because it says in the description "USE DCS CODE 165N ON THE ENCODE SIDE OF YOUR RADIO ONLY FOR LINK ACCESS" - which I'm assuming may not apply to me, but I also I'm not entirely sure what that means.