Midland Radio P-20 사용자 설명서

http://www.midlandradio.com 

Page 8 of 16 

 

You can have only two channels in the active mode at a time. If you try to activate more 

than two channels, the radio will beep two or three times. Check and turn off any other 
active channels and try again. 

4.  To change the status of a channel, use the /\ or \/ buttons to select the programmed channel 

to be removed or added from use. Press the PTT button to change the status from “oN” to 
“FF”. Select the new active channel with the /\ or \/ buttons. Press the “ENTER” button to 
return to normal operation. 

ADJUSTING THE VOLUME 
Rotate the ON/OFF Volume control (7) clockwise to increase the volume. Rotate the ON/OFF 
Volume control counter clockwise to decrease the volume. 
 
ADJUSTING THE SQUELCH 
Squelch is preset, no adjustment is available. 
 
USING THE CALL FUNCTION 
Press and release the “CALL” button (5) on the side of the radio.  
This will cause the radio to transmit a tone to alert the other people in your group to listen for a 
message. 

 

Use of the call function is discouraged if using the 22-405 or the 22-540  

 
USING THE MONITOR FUNCTION 
1.  Press and release the “MON” button (3) on the side of the radio to open the squelch. 

 

This allows you to over ride the squelch and the “CTCSS” or “DCS” tones. This is useful 

to monitor the channel before you transmit to ensure there is not someone using the 
channel when you have “CTCSS” or “DCS” tones programmed. This is also useful if you 
suspect someone in your group does not have the proper “CTCSS” or “DCS” tones 
programmed. 

2.  Press and release the “MON” button or wait 10 seconds to restore the squelch to normal. 
 
TURNING ON OR OFF THE BUTTON PRESS BEEP   
1.  With the radio turned off, press and hold the “ENTER” button (8) and turn the radio on. The 

radio will display all segments available on the display and sound the power up tone. Release 
the  “ENTER” button when the radio powers up.  The display will show “FF” or ”  oN” 
depending on the previous setting, and below in smaller letters “BEEP” 

2.  Press and release the “/\” or “\/” button to change the setting. 
3. The 

setting 

“oN” is Beep on. The setting “FF” is Beep off. 

4.  Press and release the “ENTER” button to return to operating mode. 
 
TURNING ON THE DISPLAY BACKLIGHT 
Press and release the “ENTER” button (8). A beep will be heard (if enabled). The backlight will 
stay on for about 5 seconds then turn off. 
 
TURNING THE ROGER BEEP ON OR OFF 
Roger beep is a sound the radio transmits when you release the “PTT” button (4). 
1.  With the radio turned off, press and hold the “ENTER” button and turn the radio on. The radio 

will display all segments available on the display and sound the power up tone. Release the 
“ENTER” button when the radio powers up.  The display will show “FF” or ” oN” depending 
on the previous setting, and below in smaller letters “BEEP” 

2.  Press and release repeatedly the “F” button (usually once). An icon of a musical note will be 

displayed above “oN” or “FF” on the display. 

3.  Press and release the “/\” or “\/” button to change the setting. 

 

The setting “oN” is Roger beep on. The setting “FF” is Roger beep off. 

 

The Roger beep is the same sound as the Power Up tone 

4.  Press and release the “ENTER” button to return to operating mode. 

 

Use of roger beep is discouraged when earphones or headsets are in use.