Midland Radio SP-410 - Manual (Page 24)

SP-400 Series User’s Guide
Advanced Operations
Operating hands-free
VOX (voice operated transmit) is a method that allows the
transceiver to automatically begin transmitting when it detects
sufficient audio from an optional headset microphone. Correct
VOX operation generally requires specific headset microphone
circuitry, and not all headsets that otherwise function correctly on
the radio may work properly in VOX mode.

Please be aware that the PTT button on the transceiver
is disabled when VOX operation is activated. If you want
to use PTT operation, but the status LED does not light
and no error beeps are generated when PTT is pressed,
you should make sure VOX is turned off.
Activating VOX
To activate (or deactivate when already activated) the VOX
function, switch the radio off, and hold both the upper and lower
function buttons pressed while turning the radio on. A high
pitched beep will sound and the radio PTT will be disabled when
VOX is activated. A low pitched beep will sound and the radio
PTT button will be enabled when VOX is turned off.

Your dealer may have disabled the VOX function. In this
case, only an error beep will be generated when
attempting to activate VOX.

Two VOX sensitivity selections are possible. The default
selection is low sensitivity and should be sufficient for
most headset conditions. For applications where the
ambient noise level is very low and you desire greater
microphone sensitivity, you can switch to high sensitivity.
However if ambient noise conditions are too high the
radio may transmit constantly indicating the VOX
sensitivity needs to be set lower.
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© 2005, Midland Radio Corporation