CTCSS Encoder - SARCNET
This is a simple Arduino project used to generate Continuous Tone Coded Squelch System (CTCSS) tones. CTCSS enables a limited selective calling (SELCAL) function as follows: A low-frequency (sub-audible) tone from a CTCSS encoder is injected into the modulator of a transmitter and decoded in a compatible receiver fitted with a CTCSS decoder.
Arduino CTCSS generator -- my mods using PA3GUO's code
I used this code with an Arduino Nano to generate a continuous low-frequency (123Hz), low-level tone. These tones are often called PL ("Private Line" -- a Motorola-ism and probably even trademarked for all I know) or CTCSS (Continuous Tone-Coded Squelch System) tones.
Arduino CTCSS encoder - ON7GF
So I've decided to 'quickly' put some lines of code in an Arduino and make myself a CTCSS encoder. The handy and easy Arduino C-library however isn't particularly optimized when it comes to the utilization of the timer/counters of the ATMega328p that runs the Arduino.
ARDUINO CTCSS decoder
It can be used as a plug-and-play module in your own development, where you will have to provide all the logic in function of CTCSS decoded. The parameters commented in the sketch allow to finetune the detection in accordance with applicable CTCSS tone(s) and how 'stringent' this detection is set.
Multitone CTCSS Encoder with OLED Display - ZL2PD
2020年11月28日 · My multi-tone CTCSS encoder design is simple. It allows user selection of any of the fifty standard CTCSS tones using a standard rotary encoder. A low cost OLED display shows the selected tone. It filters and outputs the tone on a standard audio 3.5mm socket. The minimal number of parts are all widely available and inexpensive.
arduino-ctcss/ctcss.ino at master · coolacid/arduino-ctcss - GitHub
CTCSS Decoder for Arduino. Contribute to coolacid/arduino-ctcss development by creating an account on GitHub.
A new display and CTCSS for the Yaesu FT-290R - vk1zdj
2023年4月11日 · Continuous Tone Coded Squelch System (CTCSS) is a system that used a sub-audible tone in the frequency range from 50 to 300 Hz sent along side the speech from the user to open the squelch in a compatible receiver.
SA6HBR/F800_Arduino_ctcss_dtmf - GitHub
En färdig LM317-modul för stabilisera drivspänningen från F800 behöver ett par extra kondensatorer för att inte Arduinon skall störas. En LM324 op samt lågpassfiler för ingående subton. Valet av komponenter får en bryt frekvens 153hz. fc= 1/ (2πRC) 47nF 22k. Arduinon skapar en fyrkantsvåg som subton och ett låpassfilter görom den till sinus.
YO3HJV: CTCSS decoder with Arduino - Blogger
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. The project of the new CTCSS decoder can be seen here.
Two Simple CTCSS Encoders - ZL2PD
Here is a very low cost versatile, accurate and super-stable CTCSS tone encoder module which should be ideal for your requirements. Two versions are described here, both using the same tiny single-sided PCB - The first is a BASIC encoder allowing link selection of one of four programmed tones, and the second is a MULTITONE encoder with Reverse ...