Hello everyone,
I have been experimenting with the Flex400 board and have been trying to
implement a basic AM transmitter. I have a WFM and NFM transmitter
working, but I cannot get the AM one to transmit correctly. The code
below generates a much higher frequency tone. Any advice to what I am
doing wrong? Does my output need filtering before connecting to the
sink?
self.u = usrp.sink_c () # the USRP sink
# Code here for setting up the USRP, omitted
src = gr.file_source (gr.sizeof_float, "audio-1.dat", True) # 440Hz tone
file
const = gr.add_const_ff (1.0)
conv = gr.float_to_complex()
gain = gr.multiply_const_cc (4000.0) # transmitter gain
# connect it all
self.connect (src, const)
self.connect (const, conv)
self.connect (conv, gain)
self.connect (gain, self.u)
Thanks,
~Chris~
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