Ctcss dtmf tone decoder encoder iw5edi simone hamradio. I was wondering if i could build such a decoder using the arduino, via one of the analog input pins. 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. In simple terms, this feature lets your scanner ignore signals you dont want to hear. This product is packaged in a metal enclosure with a backlit keypad for dial encoding. T2535sa subaudible tone decoder the mueller broadcast design t2535sa subaudible tone decoder provides a simple and reliable way to detect the 25 and 35 hz control tones sent by many satellitedelivered program networks. Upscale scanners can be optioned with a subaudible tone decoding squelch circuit. The tone scan function detects the subaudible tone that is used for repeater access. Ramsey qt1 quick tone subaudible encoder decoder topic. Comtekk multi decoder will listen for any sustained tone.
Decoding the secrets of ctcss while most rigs can send these lowfrequency audio tones, decoding them is a handy trick, too. If your subaudible tone decoder is connected to a source that delivers more than one program and one or more of the programs delivered does not contain. 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. It does this by adding a low frequency audio tone to the voice. 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. The plugin can detect ctcss tones and provide a squelch for the desired tone. Ctcss subaudible tone decoder reveals repeater access tones. Ctcss pl subaudible tone encoder generate any standard tone, or custom tone up to 300.
These tones are included in the audible main portion of audio in the case of satellite. Continuous tonecoded squelch system the radioreference wiki. Upon decoding a valid pl tone, the board gives a logic change. Many yaesu transceivers from the 1990s and thereabouts could use an optional fts8 module, that provided subtone generation for transmission, and subtone decoding for ctcss reception. Sound card calibration for highly accurate frequency control. In the past i have stated several times on the yahoo group that i would not be adding fm to the mchf a completely standalone qrp sdr hf transceiver any time soon, mostly because i was quite certain that there was simply not enough processor horsepower to do it properly, but quite recently i sort of got obsessed with making it work, going from 0 to 60 in just a few evenings of code. In the received audio path the radios audio is routed to the tone decoder input of the chip. Ctcss dcs cross tone 1 ctcss dcs cross tone ctcss you may sometimes want to hear calls only from specific persons. Comspec and connect systems have their own pages at this web site. Comtekk 2 tone 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 receiver audio output is fed into the computers sound card via cable or microphone where an ad converter reads the signals instantaneous voltage 11,025 times per. I have been using the two tone detect software for a while now to record audio after detecting tone sets. Ctcss pl tones frequencies metropolitan coordination association, inc. Very handy little device if you do much with two way radio or want to find out the tone and frequency. Two tone 2 tone encoders decoders midian electronics.
One thing i would love to create is a subaudible tone decoder. You may discover it while youre puzzling over the fact that a particular repeater seems deaf to your signals. 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. Click on the edit tone info button to set up your tone sets and distribution lists. Ctcss continuous tonecoded squelch system uses a set of separate. No internals schematics, no explanation how it works. The decoder listens to your network audio and gives you dry contact. Tone signaling works especially well on fm because the received audio is spoton in terms of frequency unlike ssb, where the precision of the tuning can affect the frequency of the recovered audio. 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 by different commercial companies for ctcss.
Features include reverse burst squelch tail elimination, timeout timer, penalty timer, and more. Dtmf decoder touch tone decoder using ic 145436 this circuit is capable of decoding 16 different pairs of tones. Scanscope allows you to monitor radio traffic and to decode and to record the various. Td11 dual tone decoder encoder encodes and decodes adjustable from 40 5000 hz stable ideal for sub audible tone access for repeaters ideal for any tone control need, dtmf, afsk, pl small size, runs on 5 15 vdc complete with applications and hookup instructions complete tone control for virtually any application easy to build. Ctcss continuous tone coded squelch system and dcs digital coded squelch. 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. Comtekk multi decoder will listen for any sustained tone signal and display the frequency or frequencies. The tone decoders have been set to trip at 10 db or higher with a nominal program input level of 0 dbm. All setup adjustments are on the pc board and have been preadjusted to provide proper operation in most situations. The pocket beep function gives you an audible and visual indicator of an incoming call. Generate sine, square or triangle waveform, 20hz 5khz. The audio input of the computer must be connected to the discriminator of the receiver. Tone signaling works especially well on fm because the received audio is spoton in terms of frequency unlike ssb, where the precision of the tuning. These programs will display the a detected ctcss tone when connected to the.
See the editing tone information section below for more information. It is common for a single radio channel to be shared over a number of user groups for frequency use efficiency. Sets subaudible tone frequency both encoder and decoder the levels 1 dark to 4 bright. Boxcast rtmp encoder activation product highlights onetime activation to use any encoder with the boxcast platform boxcast streaming plan required with. 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. And yes, since this ic is only decoder, to use it as encoder, as kit advertises, you need to soldier additional transistors, resistorc, etc.
You can use the sub03 to automate your network feeds or take the guess work out of when to cut away from networks. Satellite radio networks send down a 25hz, or 35 hz audio tone that the local radio station detects in order to play its local spots. Multi tone decoder software download scanner master. 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. Very handy little device if you do much with two way radio or want to find out the tone and frequency a radio is. A tone detector, tone decoder or tone generator is software that lets you interpret various audio frequencies and their wavelengths on telephones and various other types of digital audio devices. It encodes and decodes 38 standard ctcss tones and split tones with reverse burst. Below is the terminology used by different commercial companies for ctcss.
Encodes and decodes adjustable from 40 5000 hz dual. Very handy little device if you do much with two way radio or want to find out the tone and frequency a radio is transmitting without checking the programming. Ctcss dcs tone decoder and frequency counter youtube. Aiglon dtmf coder decoder is a small, simple and easytouse program that represents a windows touch tone keyboard used to generate a dtmf sound into your sound card. The program provides the user a audio spectrum analyzer that is powerful and. Ctcss encoder decoder board by masters communications. 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. A significant amount of interest has been generated since my last article on a pl tone board. Discussion in mobile radio systems started by kd0pez, dec 17, 20. Remote controllers with web interface or built in web server. Comtekk software tone generator code synthesizer for 2way radio signaling. 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.
Hey just wanted to let you know your two tone readerdecoder software is awsome. Fully customizable settings with adjustable levels and durations for guard tone, function tone and hold tones. The circuitwe rkes subaudibl e tone decoder description the circuitwerkes subaudible tone decoder provides a reliable and accurate solution for decoding subaudible tones from satellite, automation, or other sources of audio. Dcs digital coded squelch dcs is another application which allows. The program processes the audio signal from the receiver connected to the. Rtlsdr rtl2832u and software defined radio news and projects. Ctcss stands for continuous tone coded squelch system, it is the generic abbreviation and is used to minimize cochannel interference. Both actrive high and low outputs are available simultaneously. T2535sa subaudible tone decoder mueller broadcast design. Ctcss, continuous tone coded squelch system, is the generic name for the subaudible tone frequencies tone scan function allows you to easily find the subaudible tone needed to access a repeater or to decode a tone squelch signal.
One useful feature in an fm communications receiver is that of a subaudible tone a. 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. If anyone wonders, how this thing works, it uses lm567 tone decoder ic. The circuitwerkes sub03 is a subaudible tone decoder. Tone signaling ordering the locator pet tracking system. The mueller broadcast design t2535 subaudible tone decoder has no user adjustments. Technical information and modifications for other manufacturers equipment. Dtmf decoder touch tone decoding based on a mt8870 resistor r. This subaudible tonecontrol system was originally developed by motorola and marketed under the name private line, or just pl for short. Thats why youll often hear ctcss tones referred to as subaudibleliterally below audibility. Dedicated and builtin mp3 streaming encoders, mp3 streaming decoders, ogg streaming encoder, ogg streaming decoder, or other compressed audio transcoders.
Manufacturer of multichannel remote controls for radio broadcasting. 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. The ct30 is a ctcss decoder encoder on a single printed circuit board. Because of this interest i decided to improve on the old pl tone design. Get the right signal tone radio amateurs use tone signaling for many different uses on the amateur radio bands. So, right out the box, you wont get encoder function. Instantly discover fire dispatch pager tone frequencies with our easytouse tone decoder. When its analog i keep kg tone s volume level at midrange and it shows the subaudible tone and passes the audio like a champ. A ctcss tone is subaudible and is selectable from among 42 tone frequencies. Dual tone decoder encoder encodes and decodes adjustable from 40 5000 hz stable ideal for subaudible tone access for repeaters ideal for any tone control need, dtmf, afsk, pl small size, runs on 5 15 vdc complete with applications and hookup instructions. By ken collier, ko6ux if youre an fm operator, youll encounter ctcsscontinuous tone coded squelch systemearly in your ham career. These include the 38 ctcss tones plus splits and 106 dcs codes, as well as custom tones.
Featured items newest items bestselling alphabetical. Dmtf encoders and dtmf decoders, subaudible tone decoders, telephone autocouplers, dialup remote controls, and custom projects. Perhaps the repeater 20 miles away does not have a subaudible decoder filter which strips the transmitted ctcss pl encode tone frequency out. Tone detector works in parallel with audio streaming software and is also usable for getting signals for devices like. Scanner programming software ctcssdcs decoding software where art thou. Encodes and decodes adjustable from 40 5000 hz dual tone. Figure 1 is an inexpensive pl tone generator with significantly improved performance. It can also decode, ani and transpond in dtmf, two tone, five tone and 1500 and 2805 hz pulse tone. The unit has dry relay contacts and an led indicator for each of the standard three subaudible signals, 25hz, 35hz. Jun 17, 2014 i found these devices brand new on ebay.
Windows touch tone keyboard used to generate a dtmf sound into your sound card. For an article about this method of tone signalling, refer to the wikipedia article here link. You can also manually edit the g file using a text editor if you prefer. Use sound card to generate ctcss, dtmf, tone remote, ani and more.
A subaudible tone is a tone that is used to trigger an automated event at a radio station. 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. Ctcss is an acronym for continuous tonecoded squelch system and is a system that is used in shared two way radio systems. It is entirely selfcontained and only requires audio and control hookups. A homemade replacement for the fts8 subtone encoder. Midians tds1 is an encoder and decoder of ctcss and dcs tones. Download tone decoder software advertisement dtmf tone decoder v. Its subaudible because most fm rigs have an audio frequency rolloff higher in frequency than the pl tone, so the circuits that. The winradio digital suite is an optional software package, a collection of digital signal. Dmtf encoders and dtmf decoders, subaudible tone decoders, telephone autocouplers, dialup remote controls. The continuous tone coded squelch system ctcss allows you to ignore not hear unwanted calls from other persons who are using the same frequency.