Motorola XPR 7350 用户手册

You can adjust your radio's squelch level to filter out unwanted 
calls with low signal strength or channels that have a higher 
than normal background noise.

Settings: Normal is the default. Tight filters out (unwanted) 
calls and/or background noise. However, calls from remote 
locations may also be filtered out.

Press the programmed Squelch button.

You hear a positive indicator tone, indicating the radio is 
operating in tight squelch.
OR
You hear a negative indicator tone, indicating the radio is 
operating in normal squelch.

You can toggle your radio’s power setting between high or low 
for each channel.

Settings: High enables communication with radios located at a 
considerable distance from you. Low enables communication 
with radios in closer proximity. 

Press the programmed Power Level button.

You hear a positive indicator tone, indicating the radio is 
transmitting at low power.
OR
You hear a negative indicator tone, indicating the radio is 
transmitting at high power.

A channel can support up to 6 option board features. Refer to 
your dealer or system administrator for more information.

Procedure: 
Press the programmed Option Board Feature button to toggle 
the feature on or off.

This feature allows you to initiate a hands-free voice activated 
call on a programmed channel. The radio automatically 
transmits, for a programmed period, whenever the microphone 
on the VOX-capable accessory detects voice.

Pressing the PTT button during radio operation disables VOX. 
To re-enable VOX, do one of the following:

Turn the radio off and power it on again, OR