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75-440 User manual
Page.
17
Advanced Operations
In this section we’ll describe some advanced operation which you can do with your handheld transceiver:
Handsfree Transmit (VOX)
VOX (Voice Operated Transmit) is an automatic system, which allows you to automatically switch the
transmission in hands free mode just by speaking in the built-in microphone of a headset (not provided
with the unit). Please ensure that the handset is suitable for your transceiver as reported in the paragraph
“Microphone connection”.
1) Connect the optional headset with built-in microphone to the microphone connector located on the
transceiver’s side. Be sure the headset is equipped for “VOX” operation.
2) To activate “VOX”: Turn the radio off. Press and hold the “FUNC” +
keys turn the radio on.
“VOX” icon will be displayed.
3) Ensure that the headset’s built-in microphone is located close to the side of your mouth.
4) Press the “FUNC” key +
key to adjust the “VOX” sensitivity in order to ensure a stable
transmission when speaking with a normal voice level.
“VOX” icon will flash when LOW sensitivity is selected and on steady when HIGH sensitivity is
selected.
, We recommend setting the “VOX” for minimum sensitivity. Sensitivity set too high could cause
accidental transmissions, especially in high noise environments.
“PTT” button is disabled during VOX.
5) To DEACTIVATE “VOX”: Turn off the radio. Press and hold the “FUNC” +
keys. Turn the
radio on. The “VOX” icon will no longer be displayed. The “VOX” is now off.
Paging Call
User can alert radios of his fleet by pressing the “CALL” button. The other parties will hear a ringer type
sound.
To send an automatic “CALL”:
1) Press the “CALL” key for about 2-sec. to alert all the radios in your fleet.
2) A ringer type sound will advise the other parties about the incoming message.
3) Press the “PTT” and Speak with a normal voice level to send the message.