Apr 7, 2025 · Continuous Tone-Coded Squelch System (CTCSS) and Digital-Coded Squelch (DCS) are two technologies commonly used to achieve this goal. They allow operators to selectively mute their receivers based on specific tones or digital codes.

In telecommunications, Continuous Tone-Coded Squelch System or CTCSS is one type of in-band signaling that is used to reduce the annoyance of listening to other users on a shared two-way radio communication channel. It is sometimes referred to as tone squelch or PL for Private Line, a trademark of Motorola. [1] .

Jan 29, 2023 · For the current ETSI Standard TS 103 236 Continuous Tone Controlled Signalling System (CTCSS) and Digitally Coded Squelch Signalling (DCSS) document, go to the ETSI Standards search page and search for ETSI TS 103 236.

CTCSS stands for Continuous Tone Coded Squelch System, often referred to as “PL” (Motorola’s trade name) or “Channel Guard” (Ericsson/GE’s trade name). Many repeaters require the use …

Jun 10, 2024 · Now first we are going to discuss the Continuous Tone-Coded Squelch System which is called CTCSS in short by hams. This technique is the grandfather of privacy codes, having existed for quite some time. Despite its antiquity, CTCSS is still commonly employed in two-way radios, particularly analog ones. Here is the lowdown:

Mar 18, 2007 · Optoelectronics makes some models that will read out the freq and a ctcss, dcs, dtmf and possibly other tones. There are several models-both Uniden and RS-that can decode PL/DPLs.

Jul 20, 2020 · The Electronic Industries Alliance (EIA) released “Minimum Standards for Land Mobile Communication Continuous Tone-Controlled Squelch Systems (CTCSS)” in March 1979 as RS-220. How Many CTCSS Tones Are There? How do these terms differ? They are all the same! How Does DCS Work? The stream consists of 23 repeating digits ...

Sep 8, 2023 · Continuous Tone-Coded Squelch System or CTCSS is a function on a two-way radio that, as the name suggests, squelches, or quiets the radio until a tone code is received. In other terms, the radio speaker will stay mute and ignore calls from parties that are on your channel unless they have the same tone code as you.

Modern two-way radios contain 38 CTCSS codes which stands for Continuous Tone Coded Squelch System. The system filters transmissions to permit communication only between users who share the same tone while reducing interference from others using the same frequency.

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