Digital Code Squelch (DCS)
CDCSS or Digital Code Squelch (DCS) is a further development of the continuous tone-coded squelch system or CTCSS that uses a slow-speed, binary data stream passed as sub-audible data along with the transmission. Motorola calls this Digital Private Line or DPL.
DCS is a two way, 3-digit, digitally encoded code. Think of it as a two way password. You need the password to transmit and to receive a signal.
Let's take our Sutro repeater as an example: Once you set the frequency on your radio to 145.150 with DCS 664 you will a) have the password to open our repeater and b) since our repeater is transmitting a DCS code of 664 you will be able to receive it while blocking other transmissions that don't contain the DCS code.
Our main W6PW repeater has changed from PL 114.8 to DCS 664. Please find below instructions on how to set your radio to transmit/receive a DCS code.
If your radio is not included in this page don't worry. Check out your radio's manual and focus on the DCS section, hint: look for the keywords DCS and/or DTCS! When you figure it out, help me help others; send us [Antonis' email or contact us page] the steps in the format above and your radio brand and model number and I will include your instructions in this page.
Always remember: DCS is an Encode/Decode system, so your receiver will remain muted until a matching DCS code is received on an incoming transmission.