2 meter tone encoder
QRZ Forums. I have an old Icom ICH 2 meter rig. Actually I have two of them. One is junk and does not function.
Continuous Tone-Coded Squelch System
The other works just fine. These rigs have no PL tones in them Soooo I down loaded a tone generator off the web. Pretty neat little program. I thought if I set up tones for the local repeaters around here and let the sub audible tone run in the back ground I could run this old rig as a base here in the shack Well that was a fail.
The mic will not pass to tones. Sooo I opened up the mic on the rig that does not function and tapped into the audio circuit on the mic and bada bing I am getting the tones through the audio circuit but still can not access repeaters. I have gone through volume settings from low to high. Still no repeater access. I have tried a sweep tone from X tone to Y tone in very short segments of the target tone. Maybe I miss'n a step or two here as far as my theory on how I thought this would work, evidential so I guess.
Any thoughts on this? It's not a bad little rig and it ain't dead yet. Well, I keep fuss'n with it I'll probably kill it. What say you? N3HQNJul 8, W9GBJul 8, K7JEMJul 8, Well yes I'm looking for a cheap solution to the problem. I'm not looking for anybody to do it for me. Don't miss understand me here but, what is the deal with the I'm greater in knowledge than you attitude? I asked a pretty simple question. I didn't need a ration of crap about what level of electronic engineering I have.
Regardless of what I know or don't know. It just seems funny that you start out thinking that the party your communicating with is below you. And so what if I was looking for some body to come back with an answer to the question without spilling my blood to get it. Big deal.
Anybody out there got an easy way to do this with what I have to work with here? It's that simple. I'm not above a little hit or miss trial and error.
CTCSS – DTMF – Tone Decoder / Encoder
But you just turned something that is supposed to be fun to one degree or another into a job. I belong to a flyfishing board and when someone posts a help question there.
You help the guy out. I don't second guess his ability or knowledge. I help him out.Visit us on Facebook! SafAlert Notifier. Control and test 2-way radio systems, repeaters, ANI, Paging and more. Operate or test EIA tone-remote systems. Monitor inputs and outputs with our FREE built-in audio scope and spectrum analyzer. No external hardware required. Output may be fed directly into radio, twisted pair, or service monitor. Read on for complete description OR see the online User Manual.
Read a product review on eHam. Play single digits, or sequence. Programmable tone duration and delay settings. Generate any standard tone, or custom tone up to Download Pricing Buy Now. I recently had to modify 40 Motorola Minitor II pagers, and used ComTekk software to test them using the time-honored "hold the mike to the speaker" process, and everything was dead-on.
It saved a ton of time! Breneiser, Berks County Comm. Single and dual-tone format. Continuous, or pulse tone. Simulate Tone-Burst or Single-tone Paging signals. Fully customizable settings with adjustable levels and durations for guard tone, function tone and hold tones.
Sound card calibration for highly accurate frequency control. Safesecure shopping with PayPal. You do not need a PayPal account. To order by mail or faxplease email your request to:. Note: Java scripting must be enabled to use this form. Special pricing for currently licensed amateur radio operators, for non-commercial use. Protect your computer with ComTekk's exclusive ohm isolator with DC blocking, "hot chassis" and surge protection.
Use our Sound Card Isolators to protect computer. For more information on connecting to sound cards, click here. By purchasing or installing ComTekk Tone Generator, you agree to the terms in conditions set forth in the License. We believe in giving back to those who made the ultimate sacrifice for their communites.
All rights reserved. Take Tone Generator for a test drive: Read a product review on eHam. Custom frequencies, durations and gap may be entered to simulate any non-standard format. Standard US and international tone groups included. Audio Spectrum Analyzer Monitor signal generators or received audio. Digital storage features - Pause, save, magnify, print, copy.
Independent trace for each input or output signal. Audio Oscilloscope Test audio input signals or monitor signal generator outputs.In telecommunicationsContinuous 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 two-way radio communications channel. See squelch. It is sometimes referred to as tone squelch.
It does this by adding a low frequency audio tone to the voice. It is sometimes referred to as a sub-channelbut this is a misnomer because no additional channels are created. All users with different CTCSS tones on the same channel are still transmitting on the identical radio frequencyand their transmissions interfere with each other; however; the interference is masked under most but not all conditions.
A receiver with just a carrier or noise squelch does not suppress any sufficiently strong signal; in CTCSS mode it unmutes only when the signal also carries the correct sub-audible audio tone. The tones are not actually below the range of human hearing, but are poorly reproduced by most communications-grade speakers and in any event are usually filtered out before being sent to the speaker or headphone.
CTCSS can be regarded as a form of in-band signaling. As a simple example, suppose a two-way radio frequency is shared by a pizza delivery service and a landscape maintenance service. The landscapers have to listen to the pizza shop and the pizza shop has to hear about landscape activity. This is supposed to reduce missed messages and the distraction of unnecessary radio chatter for the other users.
Note that in the example above there are only two co-channel users. In dense two-way radio environments, many separate groups may co-exist on a single radio channel. The disadvantage of using CTCSS in shared frequencies is that users cannot hear transmissions from other groups. They may erroneously assume that the frequency is idle and then transmit at the same time as another user, thus interfering with the other group's transmissions. For example, in the above situation, a landscaper might be communicating with another landscaper.
Meanwhile, a pizza delivery driver—not hearing any transmissions—assumes that the frequency is clear and calls their dispatch office. The two simultaneous transmissions could interfere with each other—resulting in one or both not being understood. The more groups that share a single frequency and the more frequently they transmit, the more likely that this accidental interference will occur. Radios equipped with the "Busy Channel Lockout" feature will prevent transmitting in this case.Amateur Radio Archive.
Get Instant Access. Plus it has: channel capability via independent selection of 6 transmit and 6 receive crystals. Solid-state circuitry with complete built-in alignment procedures using only the manual anc the front-pane meter allow operation over a 1 MHz segment from The HW needs no automatic shut-down — it continues to generate a signal regardless of antenna condition.
Transmitter deviation is fully adjustable from 0 to 7,5 kHz, with instantaneous deviation limiting. Harmonic output is greater than 45 dB from carrier. The push-to-talk ceramic microphone supplied has an audio response tailored to the HW Excellent reception — 0. Image response is dB or better. Spurious response is — 75 dB or better. The Heathkit HW comes with two crystals used in initial set-up and alignment, give you simplex operation onKit includes microphone, quick-connecting cable for volt hook-upT heavy duty alligator clips for use with a temporary battery.
Squelch threshold: 3 jiv or less. IF rejection: Greater than 75 dB. Second IF frequency: kHz adjustable.PBCT1A Fitting Guide to Yaesu FT290MK1
Spurious output: Befow dB from carrier. Oscillator frequency: 6 MHz. Multiplier factor: X Operating frequency range: 9 to Operating voJtage range: Dimensions: 2W H x w x 9W D. Instaff it anywhere. Jn the trunk, under the hood or dashboard. Use it with any 2-meter exciter delivering watts drive.
Features fully automatic operation. An internal relay automatically switches the antenna from transmit to receiver mode when you release the mike button. All solid-state design features rugged, emitter-ballasted transistors, combined with a highly efficient heat sink, permitting high VSWR loads.
Tuned input-output circuits offer low spurious output to cover the 1. And installation is just as simple. Kit incfudes transceiver connecting cable, antenna connector.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 spot-on in terms of frequency unlike SSB, where the precision of the tuning can affect the frequency of the recovered audio.
This can be confusing for new Technician licensees and maybe for the old timers, too? Today, the pleasant dual-tone sound is very familiar to most people as part of everyday telephone use. For example, pressing the number 6 produces these two frequencies: Hz and Hz. The amateur radio world makes use of a fourth column of keys labeled A, B, C and D to provide some additional signaling options.
These frequencies were carefully chosen so that no frequency is a harmonic of another, which would have increased the possibility of a decoding error. The frequency accuracy is specified at 1. Mobile rigs tend to have the keypad built into the microphone and handheld radios have a keypad on the front of the rig. DTMF can also be used for selectively calling or alerting another station. Most mobile transceivers implement the DTMF keypad on the microphone.
Image courtesy Icom America, Inc. Distortion is the enemy of any tone signaling system, so DTMF levels should not be set too high. For most amateur FM systems, we use a peak deviation of 5 KHz. If you are using narrowband FM, such as 2. Many FM repeaters operate using carrier squelch, which means that the repeater keys up any time it hears a signal on its input frequency. Walk around a typical office building with a handheld radio…the squelch opens up when you pass a computer or other electronic device due to the frequencies being radiated.
The idea is very simple…the FM transmitter includes a continuous tone on the transmitted audio. When the receiver repeater hears the required tone, the squelch opens. If there is no tone, the receiver stays squelched, no matter how strong the signal is at the receiver.
To make the system flexible, 50 unique tones are defined so that different systems can use their own unique tones. Some radios do not implement all of these tones, so check your radio manual. This tone system is sometimes used in the land mobile service to allow multiple users to share the same repeater without having to listen to the other users on the channel. Table 2. This means that the tones will be present with the normal voice signal. To keep the transmitter from over deviating, we usually set the tone deviation at around to Hz.
Although we call these frequencies subaudible they are within the hearing range of most people. Voice communication systems are designed to use the frequency range of Hz to 3 kHz, which allows for normal speech to be understood.Hello everybody and welcome back to my blog.
DTMF is not only for radio communications but are also used in telephone calls. According to Wiki, Dual-tone multi-frequency signaling DTMF is an in-band telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers. DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use in push-button telephones supplied to telephone customers, starting in It is also known in the UK as MF4.
After the touch-tone phone was released, it took a while for it to be common place and was often viewed as a status statement if you or your family had a touch tone phone. With the release of the touch-tone phone, another change came about. It made the normal use of an operator, less and less needed to make calls because with the touch-tones it could be automated.
In the early days of DTMF phones, there were six extra buttons on a phone that four out the six are not on it any longer. There use to be an A,B,C, and D button on touch tone phone. The A,B,C and D buttons were used to access different menu options, but was later replaced with just a numerical value to replace them so these four buttons were removed. In amateur radio there is several things that you can do with DTMF.
Probably the most common use of DTMF is remote control. On some repeaters, you can remotely program them to do different things.
You can turn the repeater itself on and off, turn the CTCSS tone on and off, change the repeater tail or tail length. Some repeaters the only way you can program them is over-the-air, others you have to do on sight. I remember several times while he had that hardware, having to reprogram it for whatever reason. Thankfully at the time I had a hand-held radio that had big buttons on it. The radios that I have now are a lot smaller, therefore, have smaller buttons and they really would have been a pain with my fat fingers!
It also comes in pretty handy if you have some kind of malicious communications going across your repeater. You can just key up, punch a few buttons and your repeater will no longer repeat everything it hears until you turn it back on again. We had a guy that did this to us one time. For about a week, he would key up on the radio and start cursing or playing music or something like that.
Even though the repeater owner is normally immune to fines because of stuff like this, no body wants to hear that crap, so just turn it off! Some repeaters have auto-patches built into them. If you are on your way home from work and you want to order a pizza, guess what, you can do that to.
There was a local repeater that had an auto-patch in it and it came in so handy to order a pizza or something like that. You can also have a simplex auto-patch. The limitations to the simplex auto-patch versus one in a repeater is that you range is going to be severally shorter in most cases.
On the mobile radios that I have, you can turn on this mode and control the radio with a hand-held or other radio over the air.Well, you add it of course! Plus as an added convenience, and safety feature, remember what the tone was for each repeater!
Imagine, not having to take your eyes off the road to rotate a knob just to change the PL! Now you can have all this and, as the man on the late night infomercials says, more with the Uncoder! One of the rigs was a Kenwood TSA all-mode base station transceiver and the other was a TRA mobile that I wanted to be able to use with some of the local PL required repeaters. I wanted a device that was intuitive to use; just tune the transceiver to the repeater and let the Uncoder worry about the tone setup.
Once I had given the Uncoder the CTCSS tone information for a particular frequency, it should be able to remember the setting and automatically set up the tone info as I tuned my radio to various repeaters. The selection of a microcontroller chip to base a design on is an important decision in working out a circuit. With this feature you can make changes in the program and then download the new code to the microcontroller without removing or changing any of the components on the circuit board.
This is a great advantage while debugging your code. The device I chose for this project was the ATmega8 microcontroller. The ATmega8s input capture feature, along with its associated timer, allows the microcontroller to accurately measure the period of a waveform.
An input transition on the Input Capture Pin, U2 pin 12, causes the microcontroller to record the value one of its internal counters which is being continuously incremented by the processors crystal controlled clock. This action performs most of the functions of the frequency counter portion of the Uncoder.
ComTekk Tone Generator
RF, generated by the transceiver local oscillator, is brought into the Uncoder at spring pin P1. Although the LMX is intended to be used as a frequency generation device in the Uncoder U7 is used to amplify the local oscillator and divide the frequency down to a point where its period can be measured by the microcontrollers input capture circuitry.
The highly integrated features of this device help keep the component count down in the Uncoder. Interface to the CMXA is made through a clocked serial interface. The required 4MHz clock for U6 is borrowed from the microcontrollers crystal oscillator via C The output tone from U6 is routed to the tone level pot, R26, and then is buffered and filtered by op-amp U5 and its associated circuitry.
I used a 4 digit seven segment LED display on this project. The display is multiplexed, which means that each display digit is briefly illuminated one digit at a time, with the full 4 digit indication being scanned across the LED device.
Since the digits are scanned quickly, about 30 times a second, all of the digits appear to be illuminated at once. This display multiplexing scheme affords a simplified circuit because the displays segments are connected in parallel and require only a single drive.
The segment drive is generated by U3, an 8 output shift register. The choice of a shift register for an output port was made for economy. Since other devices in the design share the clock and data lines there is only 1 extra output line, OLD an output load strobe, required from the processor to generate the 8 segment outputs for the display.
The LED display also uses 5 digit select lines to select each of the 4 display digits plus a digit select for the mode displays. These digit select lines are generated by the microcontroller and buffered by transistors Q2, 3, 5 and 6.
Connector J1 allows an inexpensive programmer to be plugged into the Uncoder for program update. Connector J2, an 8 position modular jack, is used for connection of most of the Uncoders signals to the host transceiver. I chose the modular jack because of their easy availability, these jacks are commonly used for CAT5 network wiring.
The components used in the Uncoder required this to be a surface mount project. Although many people seem to be uncertain about their ability to build projects that employ surface mount components, the fact is that it is easier to use these devices. This, coupled with the fact that through hole parts are becoming more difficult to obtain, requires the modern ham to spend the few hours of time learning surface mount construction techniques. Surface Mount Assembly Notes:.
A mentor of mine once told me that cleanliness is next to godliness, except in soldering where cleanliness is next to nothing.
This particularly holds true with soldering surface mount components. Obtain a variable temperature soldering station, and make sure you keep the tip clean and tinned.