When the scanner receives a transmission on a channel set to the PL mode, it first decodes the PL tone included with the transmission. In the Open mode, the scanner stops on the transmission and displays the PL tone on the bottom line of the display (or displays None if no tone is included). In the Closed mode, the scanner only stops on the transmission if the PL tone matches the tone that you specified for the channel.
PL tones range in frequency from 67 Hz to 254.1 Hz. You select a PL tone by pressing STEP while programming a channel.
DPL Mode
This sets the scanner to decode digital PL tones used with some FM transmissions. Similar to PL, DPL is a digi- tal “signature” encoded on a subaudible carrier. In addi- tion to preventing interference from other nearby radio systems, DPL can also identify a specific user or group of users on a radio system. When you select the DPL mode for a channel, you can also set a specific DPL code for that channel.
When the scanner receives a transmission on a channel set to the DPL mode, it first decodes the DPL code in- cluded with the transmission. In the Open mode, the scanner stops on the transmission and displays the DPL code on the bottom line of the display (or displays None if no code is included). In the Closed mode, the scanner only stops on the transmission if the DPL code matches the code that you specified for the channel.
DPL codes range from D017 to D754 (only 100 codes are actually used within this range). You select a DPL code by pressing STEP while programming a channel.
DPL is not as popular as PL, because the effective range of
30
