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#!/usr/bin/env python
from gnuradio import gr
from gnuradio.qtgui import qtgui
class my_top_block(gr.top_block):
def __init__(self):
gr.top_block.__init__(self)
fftsize = 2048
src1 = gr.sig_source_c(1, gr.GR_SIN_WAVE, 0.1, 0.01, 0)
src2 = gr.sig_source_c(1, gr.GR_SIN_WAVE, 0.015, 0.01, 0)
src = gr.add_cc()
thr = gr.throttle(gr.sizeof_gr_complex, 20*fftsize)
self.snk = qtgui.sink_c(fftsize, gr.firdes.WIN_BLACKMAN_hARRIS, -0.5, 0.5)
self.connect(src1, (src,0))
self.connect(src2, (src,1))
self.connect(src, thr, self.snk)
if __name__ == "__main__":
tb = my_top_block();
tb.start()
tb.snk.start_app();
#tb.wait();
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