The three things which come to mind are:
1) Is the headset the VOX headset intended for the radio model? Sometimes the rings on the plug do not match the internal points of contact if it is not the intended headset. Not all headsets are VOX capable.
2) Is the headset plugged in all the way. (You mentioned plugging in and then turning on. This is good. You must always have the radio turned off when plugging or unplugging an audio device.)
3) Try pressing the PTT on the headset cord one time before switching the dip switch to VOX. (Assuming you have a headset with the small box in the line.)
Lastly, if you continue to have difficulties, contact Motorola at the 800# provided in the user guide. They should be able to assist you.
Best regards.
SOURCE: We tried using a headset with it. Now, without
Here is a link to the user guide, reference page 22 for instructions on turning iVOX and VOX on or off: http://www.giantintl.com/ContentManage/manuals/Moto/T65xx.pdf (Double check you do not have the lock symbol showing while trying to change programming.)
Also, another phenomenon which can occur is when you unplug a headset or audio device while the radio is still turned on. This can leave the radio partially in VOX mode. You might try plugging in the device with the radio turned off. Then turn the radio on, use the device in VOX mode. Then shut the radio off and remove the device. See if it clears the radio's sense of having a headset plugged in.
A damaged jack can also cause the same problem.
Best regards.
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