It encodes and decodes 38 standard ctcss tones and split tones with reverse burst. Instantly discover fire dispatch pager tone frequencies with our easytouse tone decoder. The continuous tone coded squelch system ctcss allows you to ignore not hear unwanted calls from other persons who are using the same frequency. Ramsey qt1 quick tone subaudible encoder decoder topic. 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.
Ctcss stands for continuous tone coded squelch system, it is the generic abbreviation and is used to minimize cochannel interference. 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. 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. 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 program processes the audio signal from the receiver connected to the.
Get the right signal tone radio amateurs use tone signaling for many different uses on the amateur radio bands. 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. 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. Comspec and connect systems have their own pages at this web site. This product is packaged in a metal enclosure with a backlit keypad for dial encoding. The mueller broadcast design t2535 subaudible tone decoder has no user adjustments. The tone scan function detects the subaudible tone that is used for repeater access. The winradio digital suite is an optional software package, a collection of digital signal. Ctcss continuous tone coded squelch system and dcs digital coded squelch. Click on the edit tone info button to set up your tone sets and distribution lists. Very handy little device if you do much with two way radio or want to find out the tone and frequency. The decoder listens to your network audio and gives you dry contact. 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. 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.
A subaudible tone is a tone that is used to trigger an automated event at a radio station. If anyone wonders, how this thing works, it uses lm567 tone decoder ic. Below is the terminology used by different commercial companies for ctcss. 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. So, right out the box, you wont get encoder function.
Comtekk multi decoder will listen for any sustained tone signal and display the frequency or frequencies. Ctcss is an acronym for continuous tonecoded squelch system and is a system that is used in shared two way radio systems. A significant amount of interest has been generated since my last article on a pl tone board. Manufacturer of multichannel remote controls for radio broadcasting. Ctcss encoder decoder board by masters communications. Midians tds1 is an encoder and decoder of ctcss and dcs tones. 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. A homemade replacement for the fts8 subtone encoder. Ctcss continuous tonecoded squelch system uses a set of separate. Encodes and decodes adjustable from 40 5000 hz dual. The ct30 is a ctcss decoder encoder on a single printed circuit board. 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. Perhaps the repeater 20 miles away does not have a subaudible decoder filter which strips the transmitted ctcss pl encode tone frequency out. 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 pl tones frequencies metropolitan coordination association, inc. No internals schematics, no explanation how it works. Dmtf encoders and dtmf decoders, subaudible tone decoders, telephone autocouplers, dialup remote controls, and custom projects. Ctcss dtmf tone decoder encoder iw5edi simone hamradio. It is entirely selfcontained and only requires audio and control hookups. Windows touch tone keyboard used to generate a dtmf sound into your sound card. Both actrive high and low outputs are available simultaneously. You can also manually edit the g file using a text editor if you prefer.
Upscale scanners can be optioned with a subaudible tone decoding squelch circuit. Technical information and modifications for other manufacturers equipment. Dtmf decoder touch tone decoding based on a mt8870 resistor r. A ctcss tone is subaudible and is selectable from among 42 tone frequencies.
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. Download tone decoder software advertisement dtmf tone decoder v. By ken collier, ko6ux if youre an fm operator, youll encounter ctcsscontinuous tone coded squelch systemearly in your ham career. Because of this interest i decided to improve on the old pl tone design. The plugin can detect ctcss tones and provide a squelch for the desired tone. The program provides the user a audio spectrum analyzer that is powerful and. The tone decoders have been set to trip at 10 db or higher with a nominal program input level of 0 dbm. The ctcss and dtcs tones are builtin for quiet standby and repeater access.
In the received audio path the radios audio is routed to the tone decoder input of the chip. These include the 38 ctcss tones plus splits and 106 dcs codes, as well as custom tones. Ctcss pl subaudible tone encoder generate any standard tone, or custom tone up to 300. Featured items newest items bestselling alphabetical. 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. Encodes and decodes adjustable from 40 5000 hz dual tone. These tones are included in the audible main portion of audio in the case of satellite. Use sound card to generate ctcss, dtmf, tone remote, ani and more. Sound card calibration for highly accurate frequency control. 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. 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. 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. Comtekk multi decoder will listen for any sustained tone.
The unit has dry relay contacts and an led indicator for each of the standard three subaudible signals, 25hz, 35hz. These programs will display the a detected ctcss tone when connected to the. For an article about this method of tone signalling, refer to the wikipedia article here link. Tone signaling ordering the locator pet tracking system. This subaudible tonecontrol system was originally developed by motorola and marketed under the name private line, or just pl for short. Very handy little device if you do much with two way radio or want to find out the tone and frequency a radio is.
Upon decoding a valid pl tone, the board gives a logic change. Two tone 2 tone encoders decoders midian electronics. Decoding the secrets of ctcss while most rigs can send these lowfrequency audio tones, decoding them is a handy trick, too. Fully customizable settings with adjustable levels and durations for guard tone, function tone and hold tones. One useful feature in an fm communications receiver is that of a subaudible tone a. 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.
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. Thats why youll often hear ctcss tones referred to as subaudibleliterally below audibility. The pocket beep function gives you an audible and visual indicator of an incoming call. 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. T2535sa subaudible tone decoder mueller broadcast design. 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. In simple terms, this feature lets your scanner ignore signals you dont want to hear. Scanner programming software ctcssdcs decoding software where art thou. And yes, since this ic is only decoder, to use it as encoder, as kit advertises, you need to soldier additional transistors, resistorc, etc. Boxcast rtmp encoder activation product highlights onetime activation to use any encoder with the boxcast platform boxcast streaming plan required with. 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.
Tone detector works in parallel with audio streaming software and is also usable for getting signals for devices like. Jun 17, 2014 i found these devices brand new on ebay. Ctcss dcs cross tone 1 ctcss dcs cross tone ctcss you may sometimes want to hear calls only from specific persons. 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. Discussion in mobile radio systems started by kd0pez, dec 17, 20.
Scanscope allows you to monitor radio traffic and to decode and to record the various. Dcs digital coded squelch dcs is another application which allows. One thing i would love to create is a subaudible tone decoder. 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. Comtekk software tone generator code synthesizer for 2way radio signaling. Rtlsdr rtl2832u and software defined radio news and projects.
Multi tone decoder software download scanner master. Dmtf encoders and dtmf decoders, subaudible tone decoders, telephone autocouplers, dialup remote controls. 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. Generate sine, square or triangle waveform, 20hz 5khz. Dedicated and builtin mp3 streaming encoders, mp3 streaming decoders, ogg streaming encoder, ogg streaming decoder, or other compressed audio transcoders. You can use the sub03 to automate your network feeds or take the guess work out of when to cut away from networks. 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. 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. Hey just wanted to let you know your two tone readerdecoder software is awsome. Its subaudible because most fm rigs have an audio frequency rolloff higher in frequency than the pl tone, so the circuits that. It is common for a single radio channel to be shared over a number of user groups for frequency use efficiency. See the editing tone information section below for more information. The circuitwerkes sub03 is a subaudible tone decoder.
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. You may discover it while youre puzzling over the fact that a particular repeater seems deaf to your signals. I have been using the two tone detect software for a while now to record audio after detecting tone sets. 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. I was wondering if i could build such a decoder using the arduino, via one of the analog input pins. A little off topic, but one of the reasons i want to do this in software is that.
Remote controllers with web interface or built in web server. 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. All setup adjustments are on the pc board and have been preadjusted to provide proper operation in most situations. 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. Sets subaudible tone frequency both encoder and decoder the levels 1 dark to 4 bright. It does this by adding a low frequency audio tone to the voice. Continuous tonecoded squelch system the radioreference wiki. 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. Ctcss dcs tone decoder and frequency counter youtube.
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