Ctcss and dcs decoder software

A soundcard decoder for dcs and ctcss subaudible signalling introduction this program is a sound card decoder that will display received digital coded squelch dcs codes and continuous tone coded squelch ctcss frequencies when connected to a radio receiver. A sub audio filter that removes this low frequency energy before the audio is retransmitted is necessary for reliable dcs. Comtekk multi decoder makes use of the computer sound card and software dsp digital signal processing techniques to decode and instantly display paging. Ctcss encoder decoder board by masters communications. Scanscope allows you to monitor radio traffic and to decode and to record the. More technical information on dcs can be found at these links. A single ctcss tone is transmitted, receive squelch is tonecoded to the same tone. Scanscope decodes dcs ctcss and selcal signalling received on your radio. Midian electronics has a handy pdf file that contains details of just about every tone signaling scheme used.

It is common for a single radio channel to be shared over a number of user groups for frequency use efficiency. When you purchase communication specialist products, you get quality that the communications industry h. Ctcss codes are functions that reject undesired signals on your channel. You may find this useful when you cannot recall the ctcss frequency that the other persons in your group are using. Upon decoding a valid pl tone, the board gives a logic change. Now there are a few systems that use both the dcs and ctcss on one side or the other and even using both. This old, unmaintained software comes with no warranty of any kind. Here are the ctcss and dcs tables from the icom ic91ad handheld radio manual. Below is the terminology used by different commercial companies for ctcss. A sub audio filter that removes this low frequency energy before the audio is retransmitted is necessary for reliable dcs operation. Ctcss pl tones frequencies metropolitan coordination association, inc. Need external pl ctcss tone generator for old 2mfm rig. As the ctcss tones are sent, the lower the frequency the longer it take for the decoder to trigger an output. Most rigs will only support dcs encodedecode and not just encode.

Simon, im wondering if you have considered this for any upcoming versions of the software for those of us using it in the vhf and above bands. Ctcss decoder encoder sub audible tone decoder based on aa a mx165cp from mxcom this plan is an ideal mod for old fm tx, without tone sqelch. Twoway radios free delivery possible on eligible purchases. In this video mike shows how to decode ctcssdcs tones using kgtone.

It is known by a number of different trade names such as private line pl by motorola, channel guard cg by general electric and generically as tone squelch. By ken collier, ko6ux if youre an fm operator, youll encounter ctcsscontinuous tonecoded squelch systemearly in your ham career. Ctcss dcs cross tone 2 ctcss frequency scan this function scans through all ctcss frequencies to identify the incoming ctcss frequency on a received signal. Another nice feature ive discovered with this software is that it very nicely passes the unfiltered audio to dsd, and also passes audio of the received signals to your pc speakers. Unlike ctcss continuous tone coded squelch system which uses continuous.

The ct30 is a ctcss decoderencoder on a single printed circuit board. Surecom sf401plus 27mhz3000mhz radio portable frequency. If a call containing a different tone or code is received, squelch will not open and you will not hear the call. Ctcss is an acronym for continuous tonecoded squelch system and is a system that is used in shared two way radio systems. The generic name is cdcss continuous digital coded squelch system. Dcs digital coded squelch is digital data or code word that is transmitted with the voice audio. A ctcss decoder is based on a very narrow bandpass filter which passes. Using a ctcss or dcs decoder permits your scanner to open the squelch only if the transmission has a code which matches the code you program. It is built with mostly throughhole components to allow assembly, repair or modification by the common technician. Here are the ctcss and dcs tables from the yaesu vx8r handheld. Comtekk multi decoder utilizes the latest in digital signal processing dsp technology to instantly and accurately measure the frequencies of a received twotone paging signal or fire dispatch tone out signal, ctcss pl tones, and dtmf codes. The continuous tone coded squelch system, commonly referred to as ctcss, has been in used in the land mobile radio arena from the late 1960s.

They both have the same function and work in similar ways. Let the ramsey quick tone do the job for you with digital accuracy. If so can someone point me in the direction of what i need to do to be able to set it up. Wisco international communications specialists encoder. Looking for an easy way to update your rig with subaudible frequency tones. My question is this, is there a ctcssdcs decoder built into or able to be built into any of the linux based sdr software similar to what can be done on sdrsharp on windows. The code used is that which is set in the dtcs code column. Ctcss tone and dcs code scanning option can be accessed with or without a signal. Unlike ctcss continuous tone coded squelch system which uses continuous tones below 300 hz. Comtekk multidecoder utilizes the latest in digital signal processing dsp technology to instantly and accurately measure the frequencies of a received twotone paging signal or fire dispatch tone out signal, ctcss. Scanscope and dcs decoder are free programs that can be used to decode dcs. Some googling brought me to the uv5r being able to scan for ctcss, i tried doing the same with mine and it does not do anything. Ctcss was developed into a system with numerous standard tones to choose from, often 38.

Jun 17, 2014 very handy little device if you do much with two way radio or want to find out the tone and frequency a radio is tra. Buy surecom sf401plus 27mhz3000mhz radio portable frequency counter meter sf401 with ctccss dcs decoder. Its powered by 7 to 16v dc and draws only a few ma. The audio input of the computer must be connected to the discriminator of the receiver.

Features include reverse burst squelch tail elimination, timeout timer and penalty timer. I enter the menu, go into the rctcss option, press menu again to enter into rctcss programming mode and then i click the scan button but nothing happens, holding it down also does not help with anything. Probando pluing decoder subtonos en software radio sdr en vhf, 145. A ctcss decoder might allow you to keep the radio noise at a tolerable level, while still providing a way for your. Ctcss stands for continuous tone coded squelch system, it is the generic abbreviation and is used to minimize cochannel interference below is the terminology used. Some of the amateur rigs, like the yaesy vx7r also support mixed mode pldcs or dcspl in addition to pl, plpl and dcs. Dcs ctcss decoder free downloads 2000 shareware periodically updates software information and pricing of dcs ctcss decoder from the publisher, so some information may be slightly outofdate. Both actrive high and low outputs are available simultaneously. Sep 05, 2014 heres my periodic whine about adding ctcss and dcs decoding to sdrconsole. Decoding the secrets of ctcss while most rigs can send these lowfrequency audio tones, decoding them is a handy trick, too. The ct30 is a professional, yet affordable, add on ctcss pl system on a small circuit board. Cdcss or digital code squelch dcs is a further development of the continuous tonecoded squelch system or ctcss that uses a slowspeed, binary data stream passed as subaudible data along with the transmission.

The program processes the audio signal from the receiver connected to the. Comtekk multi decoder makes use of the computer sound card and software dsp digital signal processing techniques to decode and instantly display paging, dtmf, and ctcss toneencoded information. Buy surecom sf401plus 27mhz3000mhz radio portable frequency counter meter sf401 with ctccssdcs decoder. In telecommunications, continuous tonecoded squelch system or ctcss is one type of. Our ctcss encoder kit can encode up to 47 ctcss tones with a sine wave output. 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. These two systems are also referred to by other names, including cdcss, pl and dpl, but the official terms are ctcss and dcs. These products encode standard ctcss tones, split tones, and digital coded squelch dcs. Ctcss dcs tone decoder and frequency counter radiohamguy. This board can be added to any radio or repeater that has a suitable discriminator audio connection. If they transmit with the same dcs as you, then your radio will unmute. However is does have a wide bandwidth from 2 to 300 hz. You should confirm all information before relying on it.

A later digitalcoded squelch dcs system was developed by motorola. Dcs is newer than ctcss, and has more combinations. Hey all, kinda new to this and looking into switching an old laptop over to skywave linux to be able to listen via rtlsdr with minimal work on having to set stuff up. See also matthew kaufmans mdc code from which winmdcd is based.

Ctcss dtmf tone decoder encoder iw5edi simone hamradio. 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. Comtekk multi decoder utilizes the latest in digital signal processing dsp technology to instantly and accurately measure the frequencies of a received twotone paging signal or fire dispatch tone out signal, ctcss pl tones, and dtmf codes receiver audio output is fed into the computers sound card via cable or microphone where an ad converter reads the signals. Tone calling private line is required by most repeater applications and. It consists of a 23bit telegram sent repeatedly on the channel at 4 bits per second along with the voice. This is also why there are 32 tones available and also why some repeaters will not retransmit the ctcss tone. Ctcss tone and dcs code scanning option can be accessed with or without a signal being present.

The receiver section of the fx828 has a fastpredictive ctcss tone detector which operates in parallel with a dcs decoder and a ctcssselcall tone decoder. Compatible with all digital tone coded squelch systems used in land mobile radios. In this project the ic detects 39a tones in thea a 67 hz 250 hz range you can find aa filter this embebbdeda 0300hz to. The baofeng uv5r supports the most common analog tones. Very handy little device if you do much with two way radio or want to find out the tone and frequency a radio is tra. Some radios do not remove this energy before transmission and can cause voice blocking of the decoder. Our ctcss decoder kit can decode 25 ctcss tones to a 5 bit binary output tone valid output response time and the audio from the station transmitting. Inexpensive frequency counters check ebay with ctcss decoders can also do the job and will even detect digital tones. For this reason, do not initially program your radios receiver to require a tone. They may have an intermod issue specific with that site. You may discover it while youre puzzling over the fact that a particular repeater seems deaf to your. Multi tone decoder software download scanner master.

Only when vfo mode is selected, can the detected tonecode be saved to menu 1110. Quick tone ctcss sub audible tone encoder decoder ramsey publication no. The receive tone is referred to as the decode tone. Heres my periodic whine about adding ctcss and dcs decoding to sdrconsole. There is an encode enable input that connects to the radios ptt line active low. General electric responded with the same system under the name of digital channel guard dcg. Sep 05, 2016 if they transmit with the same dcs as you, then your radio will unmute. Ctcss stands for continuous tone coded squelch system, it is the generic abbreviation and is used to minimize cochannel interference. Hey all, kinda new to this and looking into switching an old laptop over to skywave linux to be. Scanscope and dcs decoder are free programs that can be used to decode dcs codes using a pc and receiver with discriminator output.

Ctcss and dcs are systems used to ignore other users who you may be sharing a radio channel with. The tone used is that which is set in the tonesql column. You will hear a call only when you receive a signal that contains a matching ctcss tone or dcs code. This gives it an advantage over the ctcss tones in that there are. Other radios must have the same ctcss tone or code set to hear the transmission. At our orange california factory, we utilize the latest in assembly technology to help assure consistent quality throughout our entire product line. Tone decoder require a certain number of cycles to decode. It does better with ctcss than dcs but that could just be a matter of the proper audio balance. Rtlsdr rtl2832u and software defined radio news and projects.

Ctcss is an acronym for continuous tonecoded squelch system and is a. Here are the ctcss and dcs tables from the yaesu vx8r handheld radio manual. Decodes and displays ctcss, dcs, or ltr on the top line of the lcd display and displays dtmf on the bottom line of the lcd display. Comtekk multi decoder will listen for any sustained tone signal and display the frequency or frequencies. Here are the ctcss and dcs tables from the kenwood thf6a handheld radio manual. Jan 19, 2017 some radios do not remove this energy before transmission and can cause voice blocking of the decoder. Comtekk multi tone decoder software discover ctcss, dtmf and fire.

These include the 38 ctcss tones plus splits, 106 dcs codes and custom tones. The tone is selected by the combination of 5 jumpers in 6 positions. This data is subaudible with most of its energy below 300hz. Dcs digitalcoded squelch decoding requires receiver with discriminator or. Field programmable by wire jumpers to all 512 octal codes, as well as transmit and receive data polarity. The first is a plugin which shows the name and language of the shortwave station that is currently tuned in using data from. Scanning for a ctcss tone or dcs code can be done while either the frequency mode vfo or channel mode mr is selected. It will also be heard if the radio has ctcss and dcs off. Jun 24, 2015 probando pluing decoder subtonos en software radio sdr en vhf, 145. It also features a dcs code generator, which may be used in place of the ctcss tone generator. Digital coded squelch dcs is digital data or code word that is transmitted with the voice audio.