We have 4 T8500 - only one can talk, the other 3 only recieve.

Your code (PL code, interference eliminator, quiet call) is not programmed the same on both radios. The Cobra appears to be set to open squelch (no code). Set your Motorola code setting to zero (off). This should solve the problem.

Check your interference eliminator CODE, and your Qt filter (if any). These must be set identically.

Best regards.

Check your private line code (aka tone code or interference eliminator code). One of your radios possibly has it set differently than the other.

Check your Code (interference eliminator code) and your Qt filter (if any) to see if they match the other units.

Best regards.

The FV300 does not have the interference eliminator code feature. (Sorry)

http://www.giantintl.com/ContentManage/manuals/Moto/T8500%20English%20only%20June5.pdf

Try checking the vibra call settings for your vibrating issue. Also, as for the radios not communicating with one another you should check the programming of the frequency, interference eliminator and the Qt filter. All radios must be identical to work together.

Check your interference eliminator code, and also your Qt filter. Try setting both to the off position (zero) and see if you have the same problem. Another thing to check would be your batteries and battery contacts.

To change channel & code press talk and monitor while turning radio on. Radio will speak current channel. Release both talk and monitor. Press talk to change to next channel or press monitor to keep current channel. Press monitor when desired channel is selected, radio will speak current code. Press talk to change to next code or press monitor to keep current code. Press talk to change code as desired then press monitor when done. Will speak channel and code selected. Set all units in same manner to communicate.

It is likely you have the Interference Eliminator Code (aka Private Line or PL) set differently among the 4 radios. Your T8500 has 22 built in frequencies (noted by the BIG number on your screen) and 121 selectable PL codes (noted by the small number below the BIG number on your screen). All four of your radios must match on both numbers to communicate.

Use the menu button until the code starts to flash. Use the + or - button to select the code. Once you have selected the code you can press the PTT button to lock it in; or you can press the menu button to continue programming other features.

You can find a PDF of the user manual at http://snovalleyarc.org/pdf/FRS%20Radio%20Manual.pdf

Have you checked the QT filter? The T5950 have an addtional interference filter called the QT filter. It filters out other radios and allows Motorola radios to speak only to other Motorola radios with the filter. Check the QT setting on both radios by pushing the menu button 6 times, the QT setting will show. If it shows a straight line on the display the filter is not on. Now push the + button (beside the menu button), to turn the QT filter on (a Y will show on the screen when on) or the - button to turn it off (the line will show when filter is off). The radios have to match all channels and all filters to talk to each other.