Hytera DMR System Planner
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2.4.5 VOX
The VOX (Voice-operated Transmit) feature indicates that you can trigger the voice
transmission by voice directly rather than PTT. This brings more convenience to you
in radio use.
After this feature is enabled, when the microphone detects that your voice reaches
the required volume to trigger the transmission, your voice will be transmitted
automatically.
To use the VOX feature, you need to predefine the parameters, especially the “VOX
Gain Level”. Generally, a radio has an internal microphone and an external one. The
internal microphone is a built-in microphone in the radio; the external microphone is
on the accessory. Different microphones have different gain levels. In the CPS,
there are parameters for the external and internal microphone respectively. For both
microphones, the bigger the gain value is, the higher the gain level and the lower the
sensitivity will be. Adjust the “VOX Gain Level” properly on your actual
requirements.
In actual use, VOX will not work until the detected voice reaches the required
volume. As we know that people talk with some pauses. During the pauses, the
microphone detects no voice fulfilling the requirements. If it stops the transmission
then, the user’s communication fluency will be affected. To avoid this, the system
provides the VOX Hold Time: during the voice transmission, the radio will hold the
transmitting status even if the detected voice is under the required volume, so the
communication will be smooth. The VOX Hold Time shall be defined regarding the
your speaking habits. If it is set too long, the radio will stay in transmitting status
even if you have finished talking, which will consume more power of the radio; too
short time will affect the communication.
You should have reasonable configurations of the other parameters of VOX to fit
different environments. Besides, the radio or microphone should be put in proper
position, so as to avoid the transmission when the environmental noise meets the
volume requirements.
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