harmful interference

Has anyone else had problems with RFI from cheap Chinese goods? I'm currently having issues with an "Auto-VOX A118 B40" car dash cam which is destroying 2M ham/business bands within 20-30 feet of my car. A ferrite choke reduced noise to about S2 on all but one frequency (148.510 per my...

Hi, I've a small network of plain old radios and would like to prevent interference from 3rd party users. I know one way is trunking but that's too expensive. Is MDC or BIIS a solution? 2-tone or 5-tone? Thanks. Asad