Which is better dcs or ctcss

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There are many technologies that are used to build the best quality walkie-talkies. CTCSS Continuous Tone Coded Squelch System is an analog system used to reduce the disturbance of listening to other users on a shared two-way radio communication channel. It adds the tone to your transmission at certain frequencies. Human ears cannot hear these tones but communication-grade speakers reduce them and filter out before sending to speakers or headphones.

Suppose there are two entities communicating with each other on two-way radio frequency. Transmitter or receiver may not seriously distort a signal but can degrade a wide signal containing multiple frequency components during low frequency. It is extremely important for the receiver and transmitter to be on the same frequency to achieve maximum output of DCS function. Discriminator output as a step function may pop-up because of errors in transmitter and receiver frequencies and can block the decoder for some time.

In DCS operations, the occurrence of errors frequently may result in blocking out of the decoder. Additionally, administrators can choose to use a separate CTCSS tone for the repeater input, as opposed to the output, in order to minimize the possibility of the repeater hearing itself in high RF-interference environments — which happens more often than realized.

Reverse burst. In a series of transmissions between a mobile or portable subscriber unit and the base station or repeater, there normally is a loud burst of audio at the end of each transmission as the subscriber unit quits transmitting, but the receiver squelch is still open. Fortunately, the radio equipment manufacturers have devised a method to eliminate the squelch tail.

When the base station or repeater station senses this reverse burst, it immediately mutes the receiver audio and there no longer is a squelch tail; instead, what one experiences is a quiet, abrupt end of the transmission. Some radios can be set for a degree reverse burst, while others utilize a degree reverse burst. The latter was an attempt by one of the major manufacturers to make their radios sound superior to those of its competitors, but the other manufacturers soon figured out this scheme and they too made the degree reverse burst feature available.

Digital coded squelch. Motorola then came out with a digital version of the tones, and there were more than of these codes. Motorola called this digital private line, or DPL. Because of patent protection, only Motorola subscriber units could be used on these systems. Once the patents ran out in the late s or early s, then the other manufacturers did include the DCS codes in their radios.

The DCS codes also had the inverted code for each corresponding main code, and the inverted code was used as the squelch-tail eliminator on these systems. CTCSS has been employed in conventional communications systems for decades and with modern synthesized radios, there is no longer the need to add a module for CTCSS encode and decode functionality.

While the concept of CTCSS is not difficult to understand, it can be a great asset to the radio technician, engineer and end-user if employed properly.