Radios don't communicate between them

Check the programming of your frequency, interference eliminator code and Qt filter (if any). Be certain the radios match identically. If you are still having problems turn your Qt filter (if any) off, and set your code to zero. If the problem still persists, you have a radio problem.

Here is a link to the manual: http://www.giantintl.com/RadioPDFs/Outdated%20Manuals/T56XX_57XX_User_Manual_E.pdf