Here is a link to the user guide:
http://www.twowayradiosfor.com/pdf/RDX-Non-Display-manual.pdf
Instructions for setting the VOX sensitivity are on page 33.
According to the manual you program the VOX using the CPS (software). Three things which usually cause end-user problems are:
1) Failing to set the sensitivity to a number 1, 2, or 3.
2) Failing to have the radio shut off when plugging in the audio device (headset or earpiece)
3) Failing to use a VOX capable audio device. (Not all headsets and earpieces are VOX capable. Many with inline PTTs are not.)
If these items or instructions do not help, stop by your local Motorola dealer to discuss the problem.
Best regards.
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