Midland Radio 75-440 用户手册
75-440 User manual
Page. 12
Basic Operations
Switching the radio ON and OFF
To switch the radio on:
1) Rotate the “PWR/VOL” knob clockwise until the radio is switched on. The CPU will start an auto test
as follows:
•
LED will glow GREEN, then RED and turn OFF.
•
LCD will display all segments and icons. The letters "PS"("PASS") will be displayed followed by a
long beep.
long beep.
•
LCD will display the last operating mode.
The self-test goes very fast.
2) After the auto test has been carried out LCD will show the following data:
• The
channel number. (2 numeric characters).
NOTE: About 0.5 second after you select a new channel or change operation mode, the last status
is automatically saved. When the Radio is turned on, the most recently used channel is displayed.
NOTE: the following icons will be displayed depending on the operating mode.
• The currently selected TX output power: LOW for low or nothing for high in the lower left corner of
the LCD.
• A small “•” is displayed in the lower right corner of the LCD if the channel is in the SCAN list. (if
enabled)
• A
“P” is displayed to show that the channel is in the priority Scan list. ( if enabled)
• “SAT” in the upper left corner indicates that the channel is a GROUP CHANNEL (for CTCSS or
DCS tone if enabled).
• “Battery” icon when visible indicates battery is low.
• “VOX” is displayed when “VOX” function is enabled.
• A
“Key” icon to indicate that the keypad is locked.
NOTE: When “VOX” is enabled, ““PTT”” button is not working.
NOTE: When keypad is locked; only “PTT” button is enabled (with exception of VOX enabled).
To switch the radio off, rotate the PWR/VOL knob counterclockwise.
Adjusting volume
The PWR/VOL knob is used to adjust the RX volume: turn it clockwise to increase or counterclockwise to
reduce it.
reduce it.