Have you tried using the existing usrp_nbfm_ptt.py? It is intended for
exactly this application.
Matt
Kevin Rudd (Contractor) wrote:
Hello again,
Thanks for those that emailed me directly with my last request. I have
been able to get my transmit code to tune now, but it is still not working.
All I am trying to do is fm modulate a sine wave and transmit it at a
certain frequency. I have hooked up a vector signal analyzer and I see no
output from the USRP. Could I have a dysfunctional daughter card?
My newer code is below. Any help would be appreciated.
Kevin Rudd
Naval Research Laboratory
myfm.py
--
#!/usr/bin/env python
from gnuradio import gr, eng_notation
from gnuradio import usrp
from gnuradio import audio
from gnuradio import blks
from gnuradio.eng_option import eng_option
import usrp_dbid
import sys
class my_graph(gr.flow_graph):
def __init__(self):
gr.flow_graph.__init__ (self)
self.u = usrp.sink_c () # the USRP sink (consumes
samples)
# Setup Constants
self.dac_rate = self.u.dac_rate()# 128
MS/s
self.usrp_interp = 400
self.u.set_interp_rate(self.usrp_interp)
self.usrp_rate = self.dac_rate / self.usrp_interp# 320
kS/s
self.sw_interp = 40
self.audio_rate = self.usrp_rate / self.sw_interp# 8
kS/s
# Determine the daughterboard subdevice we're using
tx_subdev_spec = usrp.pick_tx_subdevice(self.u)
m = usrp.determine_tx_mux_value(self.u, tx_subdev_spec)
self.u.set_mux(m)
self.subdev = usrp.selected_subdev(self.u, tx_subdev_spec)
print Using TX d'board %s % (self.subdev.side_and_name(),)
# make blocks and connect them
src0 = gr.sig_source_f (self.audio_rate, gr.GR_SIN_WAVE, 350,
1)
fmtx = blks.nbfm_tx (self, self.audio_rate, self.usrp_rate,
max_dev=2.5e3, tau=75e-6)
gain = gr.multiply_const_cc (4000.0 );
self.connect (src0,fmtx,gain,self.u)
# set gain, tune, and turn on transmitter
self.subdev.set_gain(self.subdev.gain_range()[1]) #max Tx gain
self.u.tune(self.subdev._which, self.subdev, 462562500)
#self.set_freq(462562500)
self.subdev.set_enable(True)# enable transmitter
if __name__ == '__main__':
try:
my_graph().run()
except KeyboardInterrupt:
pass
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