système de filtrage par code de tonalité continu), est un système de réception sélective utilisé sur certains émetteurs-récepteurs pour réduire la gêne par d'autres utilisateurs partageant une même fréquence radio. Motorola's trademarked name for this system. It stands for Digitally Coded Squelch. Errors in the transmitter and receiver frequencies show up a the discriminator output as a step function. Talk about What they are and what the difference of them?CTCSS stands for Continuous Tone Coded Squelch System. CTCSS codes are functions that reject undesired signals on your channel. Both OK .No difference when using .How do I disable the beep after I press the ptt button If they transmit with the same DCS as you, then your radio will unmute. W9BU that's am great answer to the Tone/CTCSS/DCS question that often troubles many when programming their radios. DCS is newer than CTCSS, and has more combinations.Unlike CTCSS (Continuous Tone Coded Squelch System) which uses continuous tones below 300 Hz., DCS uses digital data or code words. This means less chance that a nearby station will accidentally overlap with yours. Hand-coded HTML © Copyright 2007 by Robert W. Meister WA1MIK. If a call containing a different tone or code is received, squelch will not open and you will not hear the call.
Motorola calls this Digital Private Line or DPL.It consists of a 23-bit telegram sent repeatedly on the channel at 134 bits per second along with the voice … You will hear a call only when you receive a signal that contains a matching CTCSS tone or DCS code. The FM deviation level of DCS data should be in the range of 500 to 800 Hz.Unlike CTCSS, DCS signal spectrum occupies considerable more bandwidth. … At the end of the radio transmission and about 1/2 second before the transmitter un-keys, the radio will encode a 134 Hz tone that serves as a turn off code. CTCSS (Continuous Tone-Coded Squelch System) uses sub-audible (below 300 Hz, not Because of the long time constant required for the low frequency response, a step function can block the decoder momentarily. But if too many errors occur, you may experience some blocking out of the decoder. Different CTCSS codes have different frequencies, and this is how it filters out other people - as long as they have a different CTCSS, or no CTCSS, then your radio will not pass any audio to the speaker. necessarily inaudible) tones to activate coded receivers. The distortion risk is especially high if the frequency response delays the wide band frequency components.You will find that it is extremely important for the receiver and transmitter to be on frequency to achieve maximum performance of the DCS function. Likewise, when transmitting using CTCSS or DCS, the receiving station must have a matching tone or code … Let’s talk about CTCSS and DCS today . Each code word is unique and all code words may be used on the same channel without interference. A poor low frequency response in the transmitter or receiver may not seriously distort a single frequency tone signal but may seriously degrade a wide band signal containing multiple frequency components.
Il ne doit pas être confondu avec les systèmes d'appel … A sub audio filter that removes this low frequency energy before the audio is re-transmitted is necessary for reliable DCS operation.Now there are a few systems that use both the DCS and CTCSS on one side or the other and even using both.I tried the instructions to make the rt-81 talk to the h777 it did not work, are there more detailed instructions for the rt-81 and the h777How do I make your rt21 and rt22 models work together?hi, first you need to get a cable, then download both softwares to program your radio.When is it better to use CTCSS, and when is it better to use DCS?If you have a check on software , you will find they are together in one line . Some radios do not remove this energy before transmission and can cause voice blocking of the decoder. First, I want to thank ALL … Joined Jan 13, 2019 Messages 42. It should be a "Sticky" One thing I'd add is that some radios allow different CTCSS tones on transmit and receive. If someone else transmits on the channel with a different or no DCS, the radio will not unmute. Guard).DCS (Digital-Coded Squelch) uses a 23-bit digital pattern to activate coded receivers.
tone signaling scheme used. PL (Private Line) is CTCSS and DCS Codes Compiled by Robert W. Meister WA1MIK : All digit zeros are shown in the tables with a slash through them, to eliminate the chance of confusing them with the capital letter O. CTCSS (Continuous Tone-Coded Squelch System) uses sub-audible (below 300 Hz, not necessarily inaudible) tones to activate coded receivers. It will also be heard if the radio has CTCSS and DCS off. With DCS, error correction is necessary. The DCS decoders can be effected by voice energy that falls below 300 Hz.
Unlike CTCSS (Continuous Tone Coded Squelch System) which uses continuous tones below 300 Hz., DCS uses digital data or code words. Different CTCSS codes have different frequencies, and this is how it filters out other people – as long as they have a different CTCSS, or no CTCSS, then your radio will not pass any audio to the speaker.When CTCSS is used, the audio is filtered out below about 300Hz, so that the only audio frequency energy that ends up being transmitted between 0 and 300Hz is the CTCSS tone itself (almost always any one tone between 67 and 254.1 Hz). General 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. It sends a number repeatedly encoded in digital as you speak, in the low frequencies so you do not hear it. Electric calls theirs DCG (Digital Channel Guard).These codes were extracted from a Motorola MSF5000 RSS Help file.Additional information was supplied by Eric WB6FLY.PL, DPL, RSS, and MSF5000 are trademarks of Motorola, Inc.Here are the CTCSS and DCS tables from the Icom IC-91AD handheld radio manual:Here are the CTCSS and DCS tables from the Kenwood TH-f6A handheld radio manual:Here are the CTCSS and DCS tables from the Yaesu VX-8R handheld radio manual:Midian Electronics has a handy PDF file that contains details of just about every
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