This is a simple C# program to find which CTCSS tone is being transmitted on a given frequency using Software Defined Radio. CTCSS stands for Continuous Tone-Coded Squelch System. Sometimes referred ...

Short-range-radio co-existence is now possible using CTCSS carrier generation with a 256-B sine-wave lookup table. To allow multiple users to share one carrier frequency, many handheld transceivers ...

Notch filter is used to eliminate narrowband interference. For example, there might be some constant carrier present just to the side of your channel of interest, causing constant and annoying beep in ...