[Discuss-gnuradio] Cannot Run TX Flowgraph More Than One time

[Firas A.]

Hi,

I thing there is a bug (defect) in gnuradio core. Checked with svn revisions 
7311 and 9036, on  CoreDue system with Ubuntu 8.04, and USRP + RFX900, it
seems that we cannot run TX flow graph properly more than one time. If we
started it more than one time, we will have a very distorted TX signal
(observed on spectrum analyzer). The following python code was used to check
this strange behaviour:

*************************************************************************
#!/usr/bin/env python

from gnuradio import usrp
from gnuradio import gr
import time


tb = gr.top_block()
tb.u = usrp.sink_s(0)
tb.u.set_interp_rate(512)
tb.src = gr.noise_source_s(gr.GR_UNIFORM,10000,0)
tb.subdev= usrp.selected_subdev(tb.u,(1,0))
tb.u.tune(tb.subdev._which,tb.subdev,915000000)
tb.subdev.set_enable(1)
tb.subdev.set_auto_tr(False)
tb.u.set_mux(usrp.determine_tx_mux_value(tb.u, (1,0)))
tb.connect(tb.src,tb.u)
i = 1
while i < 4:
    print "running = ",i
    tb.start()
    time.sleep(5)
    tb.stop()
    tb.wait()
    time.sleep(1)
    i +=1
*************************************************************************


Regards,

Firas
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