I seem to have a problem with having two radios. One is dedicated to APRS
and will start operating when I turn on the ignition. The other is a normal
2 meter mobile. When I key the 2 meter mobile it drives the APRS mobile
nuts. I am thinking I need a sharp band pass filter or duplexer. What is
everyone else doing about this problem? Or am I the only one with two
radios?

Joe AG4QC