Apr 24, 2016 simple explanation of ctccs tones, tone coding, squelch tones, privacy tones and what encode and decode do when programming an analogue radio. There is an encode enable input that connects to the radios ptt line active low. Comtekk multi tone decoder software discover ctcss, dtmf and fire toneout frequencies using your sound card. The tone used is that which is set in the tonesql column. Scanscope allows you to monitor radio traffic and to decode and to record the. The main category is dtmf projects that is about dtmf projects. Attach a dummy load to the transmitter and key down the transmitter while turning r1. The ct30 is a ctcss decoder encoder on a single printed circuit board.
Ctcss dtmf tone decoder and encoder resource detail. As soon as the correct frequency is obtained, the squelch will open on the transceiver with ctcss decode. Ctcss is an acronym for continuous tone coded squelch system and is a system that is used in shared two way radio systems. When that occurs, transistor q1 is turned off and the audio signal is free to drive a speaker or headset output. Comtekk multi decoder will listen for any sustained.
Jun 24, 2015 probando pluing decoder subtonos en software radio sdr en vhf, 145. Ctcss dtmf tone decoder encoder iw5edi simone hamradio. Ctcss codes are functions that reject undesired signals on your channel. We enumerate the tones using letters, which are included in the id of the repeater.
Both actrive high and low outputs are available simultaneously. Comtekk multi decoder utilizes the latest in digital signal processing dsp technology to instantly and accurately measure the frequencies of a received two tone paging signal or fire dispatch tone out signal, ctcss pl tones, and dtmf codes. It does this by adding a low frequency audio tone to the voice. How to scan for ctcss and dcs tones on a baofeng youtube. Ctcss continuous tone coded squelch systems aka tone access or. 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 havea low tones off the speaker.
Uses sound card to generate ctcss, dtmf, 2 tone paging, tone remote, and 56 tone ani. Twoway radios free delivery possible on eligible purchases. I really dont see why finding the right ctcss tone is such a big deal, at least here in the netherlands. As an example of how mathematica is used to perform various coding and decoding functions from an audio stream, this page describes how morse code can be decoded from an audio stream such as wav or mp3 file note. This is also known as private line pl by motorola, channel guard cg by general electric and generically as tone squelch. So when i suddenly got the chance to buy, in very good condition, not only the tr751e but also the tr851e as a pair of transceivers i didnt think twice. Upon decoding a valid pl tone, the board gives a logic change. This old, unmaintained software comes with no warranty of any kind. Uses sound card to generate ctcss, dtmf, 2 tone paging, tone remote, 56 tone ani, selective calling, tone burst and more. Comtekk tone generator code synthesizer for 2way radio signaling.
The winradio digital suite is an optional software package, a collection of digital signal processing. The most common type are two tones that are sent in sequence. Uses sound card to generate ctcss, dtmf, 2tone paging, toneremote, 56tone ani, selective calling, tone burst and more. A single ctcss tone is transmitted, receive squelch is tonecoded to the same tone. The 25 ctcss tones are decoded to a 5 bit binary output see kit pdf for details there is also a logic output for indicating the presence of a valid tone.
In telecommunications, continuous tone coded squelch system or ctcss is one type of circuit that is used to reduce the annoyance of listening to other users on a shared twoway radio communications channel. The continuous tone coded squelch system, commonly referred to as ctcss, has been in. Comtekk multi tone decoder software discover ctcss, dtmf and fire tone out frequencies using your sound card. These products encode standard ctcss tones, split tones, and digital coded squelch dcs. In this way, to ensure control of any device of this valuable piece of software, i would wait for the help of friends. The receive tone is referred to as the decode tone. You can use the kit to control external circuitry dependant on the tone received a 25 channel controller. Use sound card to generate ctcss, dtmf, tone remote, ani and more. This plan is an ideal mod for old fm tx, without tone sqelch. 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 tone encoded information. A soundcard decoder for dcs and ctcss subaudible signalling. Nc10310 ctcss encoderdecoder for relm radios the model nc10310 is a high stability, subaudible ctcss encoder decoder designed as a direct replacement for relm. Software to decode selective calling tones amateur radio. The on4dst ctcss encoder is a miniature ctcss tone generator.
Ctcss uses a special tone to identify each group of users, and this tone is used to prevent a group hearing radio chatter from another group sharing the channel. The best tone generator i have played with and it actually works. The sc50 is a micor noise squelch, and a cml ctcss decoder on a single printed circuit board. This is a godsend to someone in my situation as the tone generator program will generate any of the standard ctcss tones. Each code word is unique and all code words may be used on the same channel without interference. Its powered by 7 to 16v dc and draws only a few ma.
Hello, the project over a long time trying ctcss tone decoder. Pi2ehv b indicates the callsign is pi2ehv, and the tone is b, 71. Jun 26, 2007 this is a godsend to someone in my situation as the tone generator program will generate any of the standard ctcss tones. 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. Arduino ctcss encoder several years ago ive owned a kenwood tr751e and ive always regretted that ive sold this rig as looking back it was the best 2m multimode transceiver ive ever owned. To align the frequency of the tone generator, use another transceiver with ctcss decode capability for the desired pl tone frequency. 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. With time and magnitude data, the software first processes each batch of samples by applying a bandpass filter or window, thereby ignoring any frequencies outside the range of 2505,000 hz.
You will hear a call only when you receive a signal that contains a matching ctcss tone or dcs code. The project of the new ctcss decoder can be seen here. Probando pluing decoder subtonos en software radio sdr en vhf, 145. Multi tone decoder software download scanner master. The ctcss tone prevents users of a shared system from having to listen to other users talking if they are not part of the same group with the same ctcss tone. Ctcss encoder decoder board by masters communications. When the repeater ids, it also sends that letter, i. Unlike ctcss continuous tone coded squelch system which uses continuous tones below 300 hz. Another filter searches for continuous tones, ingoring noise, voice and digital communications. Simple explanation of ctccs tones, tone coding, squelch tones, privacy tones and what encode and decode do when programming an analogue radio. Surecom sf401plus 27mhz3000mhz radio portable frequency. A transmit high pass filter is included to reduce the possibility of false decoding.
As an added benefit, the program will also generate dtmf tones, two tone pager tones, and any other audio frequency in sine, square, and triangle waveforms. Tone signaling ordering the locator pet tracking system. Likewise, when transmitting using ctcss or dcs, the. Continuous tonecoded squelch system ctcss is a low continuous tone transmitted on nfm narrowband frequency modulation voice transmissions that is used to squelch and manage transmissions on a given frequency. I made a filter that integrates with the tl082 and the tone frequency of 88. Where more than one group of users is on the same radio frequency. Ctcss is an acronym for continuous tonecoded squelch system and is a system that is used in shared two way radio systems. Monitor inputs and outputs with our free builtin audio scope and spectrum analyzer. In the received audio path the radios audio is routed to the tone decoder input of the chip. See also matthew kaufmans mdc code from which winmdcd is based. Comtekk software tone generator code synthesizer for 2way radio signaling. Ctcss dcs tone decoder and frequency counter duration.
Wtb a yaesu fts7 ctcss pl tone board for a yaesu ft203r. This output is then rerouted to the ic, inverted, and used to drive an open collector muting circuit that grounds the. Ctcss decoder encoder sub audible tone decoder based on aa a mx165cp from mxcom. Instructions are in japanese as is the website but you wont need to use them as its very simple. Log file the program can automatically save the decoded code, tone or.
My goal is to tone comes from the processor to receive any output port. The bus header allows remote tone frequency programming. Tone decoder freeware, free tone decoder freeware software downloads, page 3. Continuous tonecoded squelch system the radioreference wiki. Our ctcss encoder kit can encode up to 47 ctcss tones with a sine wave output. 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 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. Scanscope decodes dcs ctcss and selcal signalling received on. How to find out if you can scan for squelch tones on a baofeng. Multiple tone switching can be easily handled by using diodes and a single pole. If a call containing a different tone or code is received, squelch will not open and you will not hear the call.
Plus, it is something you have to buy yet there is a free trial period you could use to experiment. The audio input of the computer must be connected to the discriminator of the receiver. Depending on the subaudible tone frequency selected using the programming inputs, as well as if that particular tone frequency is present in the audio input, the rx decode output pin 15 will go to a logic level one for a valid tone decode. In this video mike shows how to decode ctcssdcs tones using. The ct30 is a ctcss decoderencoder on a single printed circuit board. You should confirm all information before relying on it. Surecom sf401plus frequency counter ctcss decoder duration. Tone selection is programmable through the use of solder pad jumpers. If you work on hts and repeaters, you know this is essential information. It can decode, transpond and encode from a keypad and ani in any combination of dtmf, two tone, five tone and 1500 and 2805 hz pulse tone. The tone is selected by the combination of 5 jumpers in 6 positions. In sdrradio i set the playback device to my virtual audio cable or the free vb audio virtual cable, and then kgtone passes the audio.
Ctcss subaudible tone decoder reveals repeater access tones. 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. This not only found the frequency but also the ctcss tone on the third try, just saying try more than once to get the results that you wantneed, but now i. Uses sound card to generate ctcss, dtmf, 2tone paging, toneremote, and 56tone ani. This chip is not duplex meaning it will not generate encode and decode a tone simultaneously. The board uses a genuine micor m6709 m7716, as i have yet to find anything superior. May 02, 2012 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. At the end of the radio transmission and about 12 second before the transmitter unkeys, the radio will encode a. Twotone paging signals many public safety pagers and control systems use audio tones to activate. It does better with ctcss than dcs but that could just be a matter of the proper audio balance.
Its super convenient, and at a glance tells me much about frequency and ctcss. 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. About ctcss dtmf tone decoder and encoder the resource is currently listed in in a single category. Two tone paging decode old diy outdoor access pointclient. A valid twotone page is comprised of four elements.
A ctcss decoder might allow you to keep the radio noise at a tolerable level, while still providing a way for your. Ctcss is short for continuous tonecoded squelch system and is a low frequency tone added on to some transmissions used in handheld radio systems shared by several distinct groups. Sep 05, 2016 unlike ctcss continuous tone coded squelch system which uses continuous tones below 300 hz. Mini 6 position dip switch to select desired tones. First tone frequency a tone usually between 300 hz and. The tone used is that which is set in the tone column. This link is listed in our web site directory since monday dec 21 2009, and till today ctcss dtmf tone decoder and encoder has been followed for a total of 1653 times. 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. 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. 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. Buy surecom sf401plus 27mhz3000mhz radio portable frequency counter meter sf401 with ctccssdcs decoder. The upgrade was made possible by the work of paul on4adi who refine the code and added a necessary software filter to make the ctcss arduino decoder able to withstand to real world conditions. It is common for a single radio channel to be shared over a number of user groups for frequency use efficiency. Hence its names, twotone paging or twotone sequential.
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. Rtlsdr rtl2832u and software defined radio news and projects. A single ctcss tone is transmitted, receive squelch is open or carriertriggered. For this reason, do not initially program your radios receiver to require a tone.