The close call rf capture technology instantly tunes to signals from nearby transmitters to help you detect and. I imagine a dialog with a combobox or list that would have the common tones 103. Ailunce hd1 is a true vfo radio and support front panel programming. Remember that once a memory is programmed, it cannot be changed, short of deleting it and starting over. 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. 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. Where more than one group of users is on the same radio frequency. The pcr2500 has two powerful features, previously only available in high end military receivers. Below is the terminology used by different commercial companies for ctcss. In this video mike shows how to decode ctcssdcs tones using kgtone. Received the nski mini radio frequency meter with ctcss dcs decoder or handheld portable frequency counter nski560s text walkie talkie. A later digitalcoded squelch dcs system was developed by motorola.
Leixen vv898s 25w mobile car radio uv ctcssdcs dtmf scan vox. Useful for setting up safalert notifier or for programming scanners with a. 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. 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. It consists of a 23bit telegram sent repeatedly on the channel at 4 bits per second along with the voice transmission. Field programmable by wire jumpers to all 512 octal codes, as well as transmit and receive data polarity. Wisco international communications specialists encoder. I can program my uv5r with chirp and the same cable fine. 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. As i opened the package i notice i am missing some items that was in the photos. It features locationbased scanning which connects an optional gps for automatic channel selection. 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. Info and dcs decoder identifying transmitters with ctcss fingerprinting.
Different ctcss codes have different frequencies, and this is how it filters out other people as long as they have a different ctcss, or no ctcss, then your radio will not pass any audio to the speaker. See the dpl dcs page for information on a digital coded squelch system unlike the analog pl ctcss squech systems, the 23 bit dcs dpl squelch system is the same for all manufacturers. Here are the ctcss and dcs tables from the icom ic91ad handheld radio manual. Page 55 decoding the secrets of ctcss while most rigs can send these lowfrequency audio tones, decoding them is a handy trick, too. Here are the ctcss and dcs tables from the kenwood thf6a handheld radio manual. Nov 25, 2018 how to find out if you can scan for squelch tones on a baofeng. In telecommunications, continuous tonecoded 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. Vhf uhf dual band baojie bj318 amateur mini mobile radio.
Ctcss and dcs are systems used to ignore other users who you may be sharing a radio channel with. On the second line the display may be changed to indicate either decoding of any sub audible tones or codes ctcss, dcs, ltr or dtmf or signal strength. It consists of a 23bit telegram sent repeatedly on the channel at 4 bits per second along with the voice. Comtekk multi tone decoder software discover ctcss, dtmf and fire toneout. The proper input under recording properties must be selected, and some level tweaking is necessary, but it does a pretty nifty job. You have to check with the practice by that operator or in your local area. Baojie bj318 vhf uhf dual band mini mobile radio the bj318 mini mobile radio station mobile walkie talkie is with 10km ham vhf uhf dual band ptt walkietalkie for cars intercom. The unit works likes its big brother but does not allow ctcss dcs dtmf decoding and signal strength. How to scan for ctcss and dcs tones on a baofeng youtube.
This allows distant repeaters using a different ctcss to coexist on the same frequency. The small piece with the red cap on it and the wire with the same attachments on it. Rtlsdr rtl2832u and software defined radio news and projects. Ctcss was developed into a system with numerous standard tones to choose from, often 38. For this reason, do not initially program your radios receiver to require a tone. You can add or remove channels from scanning list using the free computer software. A ctcss decoder is based on a very narrow bandpass filter which passes. Technically this is a dpl dcs code to a tone change transition or 4. Dec 17, 20 other radios must have the same ctcss tone or code set to hear the transmission. By ken collier, ko6ux if youre an fm operator, youll encounter ctcsscontinuous tonecoded squelch systemearly in your ham career. Upon decoding a valid pl tone, the board gives a logic change.
It would be really nice if the squelch system supported ctcss, also known as tone decoding or pl tones. Please be warned that this support is completely untested at this time since i dont have one of these scanners to test with. Errors in the transmitter and receiver frequencies show up a the. Dcs digital coded squelch, also referred to as digital private line all 104 standard codes. See the dpl dcs page for information on a digital coded squelch system unlike the analog plctcss squech systems, the 23 bit dcsdpl squelch system is the same for all manufacturers. My expectation was that i had just to download a already made file for chirp and program the radio that way, but it turns out the software doesnt recognize the radio for some reason. These include the 38 ctcss tones plus splits, 106 dcs codes and custom tones. Received the nski mini radio frequency meter with ctcssdcs decoder or handheld portable frequency counter nski560s text walkie talkie. How to find out if you can scan for squelch tones on a baofeng. Ctcss is purely analog, so if youre building a radio from scratch it would probably be easier to implement.
These products encode standard ctcss tones, split tones, and digital coded squelch dcs. Other radios must have the same ctcss tone or code set to hear the transmission. I am currently using sdr console, very successfully, to monitor local volunteer fire departments and rebroadcast transmissions for members to hear on their phones. You can program memories either with a standard split or with odd splits. Its an inexpensive way to get into computer control scanning. By ken collier, ko6ux if youre an fm operator, youll encounter ctcss continuous tonecoded squelch systemearly in your ham career. Ctcssdcs, pocket beep, if shift, auto memory write, afc, agc, weather alert, 24 digit dtmf tone decoder and up to 2600 memory channels per file. Scanscope and dcs decoder are free programs that can be used to decode dcs codes. Scanscope allows you to monitor radio traffic and to decode and to record the. The latter is switchable to perform either ctcss or selcall tone decoding of a userprogrammable set of up to 15 tones.
Although many repeaters are now requiring ctcss encoding repeater tone, not all repeater operators are transmitting a ctcss tone to allow for ctcss decoding sql tone by your handheld. Ctcss is a bit more forgiving to implement, since it requires less bandwidth. Psredit100 configuration editor for the psr100 and psr. I happened across this software, and it seems to be doing a reasonably good job of decoding ctcss and dcs subaudible tones. Comtekk multi decoder will listen for any sustained tone signal and display the frequency or frequencies. Jan 19, 2017 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 radio has 2 power levels 5 watts maximum, allowing you to choose how far you can communicate. Decoding the secrets of ctcss while most rigs can send these lowfrequency audio tones, decoding them is a handy trick, too. Cml semiconductor products ctcssdcsselcall processor fx828. By leaving the ctcssdcs dec decoding left open, you should receive any signal on the specified frequency. In telecommunications, continuous tonecoded squelch system or ctcss is one type of. Most rigs will only support dcs encodedecode and not just encode. Both actrive high and low outputs are available simultaneously.
Comtekk multi tone decoder software discover ctcss, dtmf and fire tone out. Continuous tonecoded squelch system the radioreference wiki. The unit works likes its big brother but does not allow ctcssdcsdtmf decoding and signal strength. It will also be heard if the radio has ctcss and dcs off. The audio input of the computer must be connected to the discriminator of the receiver. This model has fm radio capability, and adds ctcssdcs decoding. 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 it is a use of subaudible tones that are transmitted along with the speech portion of. Dcs digitalcoded squelch decoding requires receiver with discriminator or. Also there is another program the same person wrote, called winmdcd, which has the capability of decoding mdc1200 data. Unlike ctcss continuous tone coded squelch system which uses continuous tones below 300 hz. The receive tone is referred to as the decode tone.
Multi tone decoder software download scanner master. Ctcss usually works better, and further into the noise than does dcs. Signal analysis and decoding glossary software glossary. After know how to set ctcss dcs on software, we can see how to set it on the radio now. Added support for the radioshack pro405 base scanner. Some, but not all, repeaters will transmit a ctcss tone back. Only all channels tx and rx frequency same as the other one, and ctcssdcs same as the other one, they can talk with each other. Ctcss encoder decoder board by masters communications. If they transmit with the same dcs as you, then your radio will unmute.
It is pretty selfexplanatory to set up using the fm detector option, and it should work with any receiverscanner that has a discriminator tap, as well as the rtl2832u dongle which is how im testing it using virtual audio cable or vb audio virtual cable. Also, ctcss sounds less objectionable than dcs, on radios without filtering. These two features are dual watch and diversity reception. The program processes the audio signal from the receiver connected to the. Features include reverse burst squelch tail elimination, timeout timer, penalty timer, and more. Sep 05, 2016 hi, first you need to get a cable, then download both softwares to program your radio. There are over 40 different ctcss codes and you can program a specific ctcss or dcs code into each memory channel.
Installs with mounting tape and onboard mini plug and wire set. Winctcss actually does a decent job of decoding ctcss tones while listening to such a feed. Ctcss is an acronym for continuous tonecoded squelch system and is a. Ctcss is part of a repeaters receiver that allows only signals with the proper tone to access or open the receiver. The ct30 is a ctcss decoderencoder on a single printed circuit board. You may discover it while youre puzzling over the fact that a particular repeater seems deaf to your signals. The twoline lcd displays the frequency of the transmitted signal on one line. Dcs is newer than ctcss, and has more combinations. Ctcssdcs programmable ctcssdcs wide bandnarrow band selectable endtone detection dtmf encodedecode ptt id password firmware update dual time slot for point to point dual time slot for repeater 5 watt output power call detection call prompt remote monitoremergency alarm contact view and edit message view and edit call info view and edit.
Tottimeout timer font setbigsmall voxlevel adjustable busy channel lockout. The bearcat bc296d scanner covers from 25 to 0 mhz less cellular and uhf tv in 27 bands. The m400 has several functions that you can program. The band is fmanalog mode, we can enter into band ab set. You should confirm all information before relying on it. General electric responded with the same system under the name of digital channel guard dcg. Need external pl ctcss tone generator for old 2mfm rig. The uniden bcd996p2 25,000 channels and gps compatible digital mobile scanner significantly raises the bar with the latest apco project 25 phase ii systems. Uniden bcd996p2 scanners, bcd996p2 ham radio outlet. The tds3 supports motorolas private line pl and digital private line dpl, as well as channel guard and digital channel guard. It does this by adding a low frequency audio tone to the voice.
My cobra cxt1095 offers both type of privacy codes. Ctcss and dcs are systems used to ignore other users. Memories store receive and transmit frequencies, along with receive and transmit ctcss or dcs codes, power level, and channel width wide or narrow. The only problem i run in to on the uhf frequencies 450512, there is a lot of interference in my area. 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. Bc296d bearcat digital trunking scanner uniden america. Write a blank codeplug generated with the new option from the file menu of the program software to radio 4. Ctcssdcs can be set together, once finish, press ok button to edit 16 channels at one time.
Ctcss for dummys was glad to get my general liscense and drop the 2 meter mess and just go with hf. Wtb a yaesu fts7 ctcss pl tone board for a yaesu ft203r. A later digitalcoded squelch dcs system was developed by motorola under the trademarked name digital private line dpl. Optotrakker by optoelectronics a addon black box that will allow the optoscan456 to do motorola trunking and decode and display ctcss,dcs,ltr and dtmf.
You can give channels alphanumeric names, using a computer. You can program your uv5r triband exactly how you want it. Digital coded squelch dcs is digital data or code word that is transmitted with the voice audio. The generic name is cdcss continuous digitalcoded squelch system. Cml semiconductor products ctcssdcsselcall processor fx828 1997 consumer microcircuits limited. Input your starting rxreceive and txtransmit frequency and frequency space between each channel, advanced feature optionseg. This gives it an advantage over the ctcss tones in that there are more. Decoding a dcs signal obviously requires a digital processor. Ctcss stands for continuous tone coded squelch system, it is the generic abbreviation and is used to minimize cochannel interference. 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. Sophisticated total channel control allows the user to program.
In the ctcss mode it performs a more accurate but slower analysis of the tones detected by the fastpredictive ctcss. Scanscope decodes dcs ctcss and selcal signalling received on your radio. These include the 38 ctcss tones plus splits and 106 dcs codes, as well as custom tones. The fx828 is an innovative ctcss, dcs and selcall codec, designed for the latest generation of land mobile. It is common for a single radio channel to be shared over a number of user groups for frequency use efficiency. More technical information on dcs can be found at these links. 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.
Midian electronics has a handy pdf file that contains details of just about every tone signaling scheme used. Ctcss or selcall tone decoding of a userprogrammable set of up to 15 tones. With its amazingly quick measurement speed, the xplorer is the most sensitive nearfield instrument of its kind. Maybe improvements have been made, but that was always my perception from years ago. Hello, i am also very intersted in a ctcss dcs squelch like option. Features include reverse burst squelch tail elimination, timeout timer and penalty timer. Ctcss pl tones frequencies metropolitan coordination association, inc. Glen and i explained about everything you ever want to know about ctcss and its history. Ctcss dcs tone decoder and frequency counter youtube.
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