CTCSS Squelch gr_ctcss_squelch_ff from gnuradio import gr gr.ctcss_squelch_ff($rate, $freq, $level, $len, $ramp, $gate) set_level($level) Sampling Rate (Hz) rate samp_rate real Tone Frequency freq 100.0 real Level level 0.01 real Length len 0 int Ramp ramp 0 int Gate gate False bool in float out float