BTS Master MT8221B and MT8222B : GPS (Option 31) : GPS Menu
  
GPS Menu
Key Sequence: Shift, System (8) > GPS
GPS Menu
GPS
Press this submenu key to turn GPS on or off.
GPS Info
Press this submenu key to display the current GPS information.
GPS Voltage
3.3 V 5 V
Press this submenu key to set the source voltage to be either 3.3 V or 5 V depending on the GPS receiver being used. GPS antenna voltage is set to 3.3 V by default in order to prevent accidental damage to lower‑voltage GPS antennas.
Note: Typical base station GPS antennas are 5V, please check your antenna voltage to choose the correct value.
Reset
Press this submenu key to reset the GPS for a new location.
Back
Press this submenu key to return to the System Menu.