Field programmable by wire jumpers to all 512 octal codes, as well as transmit and receive data polarity. Dcs is a squelching system similar to ctcss which allows for radio user sharing by ensuring that radio users are not bothered by communications not intended. Decodes off discriminator input, impedance 60k ohms, ac coupled. It consists of a 23bit telegram sent repeatedly on the channel at 4 bits per second along with the voice transmission. Compatible with all digital tone coded squelch systems used in land mobile radios. The second plugin is a digital code squelch dcs decoder plugin. Its powered by 7 to 16v dc and draws only a few ma. Jan 19, 2017 some radios do not remove this energy before transmission and can cause voice blocking of the decoder. 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. Norcomm nc101 subminiature ctcss encoder for radio tone squelch new. Sep 05, 2016 if they transmit with the same dcs as you, then your radio will unmute. Ctcss tone and dcs code scanning option can be accessed with or without a signal.
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. A ctcss decoder is based on a very narrow bandpass filter which passes. Buy products related to ctcss radio products and see what customers say about ctcss radio products on free delivery possible on eligible purchases. 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. If they transmit with the same dcs as you, then your radio will unmute. A single ctcss tone is transmitted, receive squelch is tonecoded to the same tone. When you purchase communication specialist products, you get quality that the communications industry h.
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 soundcard decoder for dcs and ctcss subaudible signalling. Here are the ctcss and dcs tables from the kenwood thf6a handheld radio manual. The da conversion is achieved by an 8bit converter using pwm modulation. Here are the ctcss and dcs tables from the icom ic91ad handheld radio manual. Our popular tone signaling wall charts are available for free upon request. The tone used is that which is set in the tonesql column. The project of the new ctcss decoder can be seen here. 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. This program is a sound card decoder that will display received digital coded. This is also why there are 32 tones available and also why some repeaters will not retransmit the ctcss tone. Midian electronics a leader in tone signaling and voice.
Scanning for a ctcss tone or dcs code can be done while either the frequency mode vfo or channel mode mr is selected. Now there are a few systems that use both the dcs and ctcss on one side or the other and even using both. These products encode standard ctcss tones, split tones, and digital coded squelch dcs. A later digital coded squelch dcs system was developed by motorola under the trademarked name digital private line dpl. Wisco international communications specialists encoder. This meter using dotmatrix lcd display is designed to detect frequency, power, ctcss and dcs of radio device. Ctcss dcs tone decoder and frequency counter radiohamguy. A single dtcs dcs code is transmitted, receive squelch is digitally tonecoded to the same code. The reason i would like to do this is so that the ctcss will open up on very weak signals that might get. Inexpensive frequency counters check ebay with ctcss decoders can also do the job and will even detect digital tones. They may have an intermod issue specific with that site. The only differences are the encode decode method and the number of selectable codes. Scanscope and dcs decoder are free programs that can be used to decode dcs.
The receive tone is referred to as the decode tone. Some of the amateur rigs, like the yaesy vx7r also support mixed mode pldcs or dcspl in addition to pl, plpl and dcs. Being it is receive only, i really dont need encode functions but if that is all that is out. The ct30 is a ctcss decoder encoder on a single printed circuit board. Digital coded squelch dcs is digital data or code word that is transmitted with the voice audio. Ctcss continuous tone coded squelch systems aka tone access or pl ctcss 1. This old, unmaintained software comes with no warranty of any kind. Decode sensitivity better than 15mv rms with signal to noise better than 4db sinad. 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. Unlike ctcss continuous tone coded squelch system which uses continuous tones below 300 hz. Ctcss dcs does not cause your conversation to be private.
In this video mike shows how to decode ctcssdcs tones using kgtone. Norcomm nc102 tunable ctcss encoder decoder for radio tone squelch new. Midian electronics has a handy pdf file that contains details of just about every tone signaling scheme used. Dcs is newer than ctcss, and has more combinations. 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. Only when vfo mode is selected, can the detected tonecode be saved to menu 1110. 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.
If so can someone point me in the direction of what i need to do to be able to set it up. Ctcss is an acronym for continuous tonecoded squelch system and is a. Being it is receive only, i really dont need encode functions but. Uses sound card to generate ctcss, dtmf, 2tone paging, toneremote, 56tone ani, selective calling, tone burst and more. The code used is that which is set in the dtcs code column. I need someway to decode which ones are being used and keep a log of them with a time stamp. For this reason, do not initially program your radios receiver to require a tone. Decodes and displays ctcss, dcs, or ltr on the top line of the lcd display and displays dtmf on. Sep 05, 2014 heres my periodic whine about adding ctcss and dcs decoding to sdrconsole. Some radios do not remove this energy before transmission and can cause voice blocking of the decoder. A ctcss decoder might allow you to keep the radio noise at a tolerable level, while still providing a way for your. The tone is selected by the combination of 5 jumpers in 6 positions. My question is this, is there a ctcss dcs 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.
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. 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. 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. The plugin will display the dcs codes that are transmitted with the signal and will display all possible compatible codes. Ctcss dcs tone decoder and frequency counter youtube. Multi tone decoder software download scanner master. Digital coded squelch dcs is also known as motorola digital private line dpl dcs is a digital form of ctcss. Continuous tonecoded squelch system the radioreference wiki. There are a few software titles that will decode a pl tone but i have yet to find one that will. Scanscope allows you to monitor radio traffic and to decode and to record the.
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. The program processes the audio signal from the receiver connected to the. 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 yaesu vx8r handheld radio manual.
Dcs or, as they called it, dpl, was developed by motorola back in the 1970s, originally, there were 777 codes plus 777 inverted codes. 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. 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. Dcs digitalcoded squelch decoding requires receiver with discriminator or. There is an encode enable input that connects to the radios ptt line active low. Not only detect frequency but also detect the radio power. A later digitalcoded squelch dcs system was developed by motorola. 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. 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. At our orange california factory, we utilize the latest in assembly technology to help assure consistent quality throughout our entire product line. I therefore modified the software to use a software dds generator which will output a nice sinus. Dcs 23 microminiature dcs encoder decoder specifications. 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. Ctcss, dcs, burst tone, tone remote, morse id, motorola quick call, plectron, reach, fivetone, sixtone, and more. Comtekk multi tone decoder software discover ctcss, dtmf and fire. Tone decoder require a certain number of cycles to decode. 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. Instead of sending a continuous audio tone however, it transmits a low level digital signal. Please help i have a situation where there are a handful of ctcss tones being used on a frequency. Includes all the features of our popular 2tone decoder, plus. Buy surecom sf401plus 27mhz3000mhz radio portable frequency counter meter sf401 with ctccss dcs decoder.
I noticed that it was very difficult to find a working link to download this software since. Ctcss and dcs are systems used to ignore other users who you may be sharing a radio channel with. However, that just did not work out and there were a lot of false signals which would open the squelch even though the correct code was not sent. The generic name is cdcss continuous digital coded squelch system. You may find this useful when you cannot recall the ctcss frequency that the other persons in your group are using. Some of the amateur rigs, like the yaesy vx7r also support mixed mode pl dcs or dcs pl in addition to pl, plpl and dcs.
Im looking to add a ctcss decoder module into an icom r7000 andor r9000 receiver. Our ctcss encoder kit can encode up to 47 ctcss tones with a sine wave output. You should confirm all information before relying on it. The audio input of the computer must be connected to the discriminator of the receiver. Dcs sends a fixed octal digit 4 as the first digit, followed by the three octal digits shown. Both actrive high and low outputs are available simultaneously. As the ctcss tones are sent, the lower the frequency the longer it take for the decoder to trigger an output. Installs with mounting tape and onboard mini plug and wire set.
Ctcss dtmf tone decoder encoder iw5edi simone hamradio. Most rigs will only support dcs encodedecode and not just encode. Ctcss tone and dcs code scanning option can be accessed with or without a signal being present. Ctcss for dummys was glad to get my general liscense and drop the 2 meter mess and just go with hf.
These two systems are also referred to by other names, including cdcss, pl and dpl, but the official terms are ctcss and dcs. Upon decoding a valid pl tone, the board gives a logic change. Ctcss encoder decoder board by masters communications. In telecommunications, continuous tonecoded squelch system or ctcss is one type of. 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. This gives it an advantage over the ctcss tones in that there are. The first is a plugin which shows the name and language of the shortwave station that is currently tuned in using data from. Ctcss was developed into a system with numerous standard tones to choose from, often 38.
Unfollow ctcss encoder to stop getting updates on your ebay feed. Twoway radios free delivery possible on eligible purchases. A sub audio filter that removes this low frequency energy before the audio is retransmitted is necessary for reliable dcs operation. Need external pl ctcss tone generator for old 2mfm rig. General electric responded with the same system under the name of digital channel guard dcg. See also matthew kaufmans mdc code from which winmdcd is based. Rtlsdr rtl2832u and software defined radio news and projects. Scanscope decodes dcs ctcss and selcal signalling received on your radio.
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