I want to design a FM radio with freq deviation can be change.
Then I tried to modified an example in GNUradio example folder which name
"fm_tx4.py" in line61,let max_dev=5 to 50K,shown in following yellow label.
but there is no change at all in a spectrum analyzer.
Help me,thanks
class pipeline(gr.hier_block2):
def __init__(self, filename, lo_freq, audio_rate, if_rate):
gr.hier_block2.__init__(self, "pipeline",
gr.io_signature(0, 0, 0),
# Input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex))
# Output signature
src = gr.file_source (gr.sizeof_float,'/home/sdr/Desktop/hu/1.wma',
True)
fmtx = blks2.nbfm_tx (audio_rate, if_rate, max_dev=5, tau=75e-6)
# Local oscillator
lo = gr.sig_source_c (if_rate, # sample rate
gr.GR_SIN_WAVE, # waveform type
lo_freq, #frequency
1.0, # amplitude
0) # DC Offset
mixer = gr.multiply_cc ()
self.connect (src, fmtx, (mixer, 0))
self.connect (lo, (mixer, 1))
self.connect (mixer, self)
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