I started application but dont transmit any signal ? Why ? I dont understand ? 
I am listening in rtl sdr but dont transmit any signal . What is my error ? I dont contact any antenna to the device .


murat@murat-VivoBook-14-ASUS-Laptop-X407MA-X407MA:~$ pacat -r -d alsa_output.pci-0000_00_0e.0.analog-stereo.monitor | \
> pv -B 256k | \
> sox -t raw  -r 44100 -e signed-integer -L -b 16 -c 2 - -c 1 -e signed-integer -b 16 -t raw - \
> biquad 4.76963 -2.98129 0 1 0.78833 0 sinc -15k loudness 5 | \
> fl2k_fm - -s 130e6 -c 30e6 -i 44100
Samplerate: 130.00 MHz
Carrier: 30.00 MHz
Frequencies: 100.00 MHz, 160.00 MHz
Failed to switch interface 0 to altsetting 1, trying to use interface 1
Allocating 6 zero-copy buffers
^C24,2MiB 0:18:45 [0,00 B/s] [                                               <=> ]
Signal caught, exiting!
^CSignal caught, exiting!