Pl tone encoder software

This is the sampling rate. With time and magnitude data, the software first processes each batch of samples by applying a band-pass filter or window, thereby ignoring any frequencies outside the range of , Hz.

Another filter searches for continuous tones, ingoring noise, voice and digital communications. Frequencies below Hz are generally reserved for CTCSS sub-audible tones used to access repeaters and limit interference. The tone frequencies are displayed immediately on screen. Click here to return directly. Menu: Main Version: Oct 28, Revised: v1. Here is a very low cost versatile, accurate and super-stable CTCSS tone encoder module which should be ideal for your requirements.

A continuous low level audio tone in the range of 67 — Hz is mixed with audible — Hz speech when transmitting. Each group of users sharing the repeater is assigned a specific CTCSS tone by the repeater operator or owner. The logic outputs are not totem pole, however, separate active high and active low logic outputs are available.

There are open collector outputs available from 2 holes marked A - B that are included on the circuit board. These outputs can be used for operations that are beyond the original scope of this board.

The 6 spare hole traces that terminate to individual pins on the DB25 can be used to wire up remote control of the tone frequency, or other things I may not have thought of.

Maximum is 24 VDC. Low current draw, about 7 mA standby and 20 mA with the LED lit, depending on logic sourced and its input impedance. Measured at Pull-up and pull-down resistors are included. Small size - can fit inside many radios. Simple to hook up and set up. Requires a few hundred mV RMS of "raw" audio. Repair available for units out of, or not covered under, warranty my determination.

Mounts with double-sided foam tape or stand-offs not included. Hookup is made with a mating DB25 male connector not included. Comes with thru-hole resistors and capacitors, and is okay for the first time builder.