E F Johnson Company 2425770 사용자 설명서

Viking Portable 600 Radio Operating Manual

5-5

Digitally Coded Squelch (DCS) uses digital data instead of subaudible tones to control the 
squelch. When the push-to-talk switch is released, a turn-off code is transmitted which 
eliminates the squelch tail similar to the reverse burst. 

A programmed option lets the radio disregard any CTCSS/DCS or NAC/Talkgroup 
information on the current channel. This feature is best described as a monitor mode with 
no white noise. In analog it is functionally the same as turning the squelch mode to 
“normal.” In digital mode it is analogous to checking the “digital squelch” box when 
programming the radio. The function can be programmed to any button or the ABC toggle 
switch, and the menu. The mode will stay active through channel changes (between 
conventional channels) and during scan. While the feature is active the monitor icon will 
be displayed.

Squelch settings on a conventional analog channel can be changed by the user from -7 to 
+7. A menu item or function button can be programmed for squelch adjust. While on a 
conventional analog channel without emergency or scan active, the user can select the 
programmed button or menu item for squelch adjust. The current squelch setting will 
show on the display.

Using the up and down buttons on the portable, the user can adjust the squelch setting to a 
desired level from -7 to +7. Increasing the value towards +7 causes the squelch to open 
sooner for weaker signals while decreasing towards -7 has the opposite effects. Pressing 
the select button will store the new squelch setting and return the user to the main display.

This feature allows the normal transmit and receive Call Guard (CTCSS/DCS/NAC) 
programming to be temporarily overridden with a code selected from a pre programmed 
list. It is available if the Squelch Select List option button or menu parameter and a 
CTCSS/NAC code list have been programmed.