Hi Guanbo, In my case, I added a tb.wait() after the tb is unlock to wait for the unlock action finished, so that the last line shows. However, it still gives the carrier wave on the oscilloscope. I also tried top_block._u._subdev.set_enable(False) to completely disable the transmitter then set_enable(True) to re-enable the transmitter based on hardware consideration, but it still doesn't work as my expectation. If any idea comes up to solve this problem, I will really appreciate.
I also concern if the message_source and the insert_tail that I'm using is
correct or not?
I really appreciate all of your help! Really appreciate!
Thanks,
Yan
On 02/23/11, Guanbo <gbzh...@gmail.com> wrote:
>
>
> Hi, Yan
>
> I tried the similar python code as yours, as follows:
>
> tb.start()
> send_pkt("payload", eof=False)
> print "before lock()"
> tb.lock()
> print "after lock()"
> time.sleep(1)
> print "before unlock()"
> tb.unlock()
> print "after unlock()"
>
> I found out that, the last print is not showing up.
>
> Do you have idea regarding to this issue?
> Thanks
>
>
>
>
>
>
> Yan Nie wrote:
> >
> >
> > Hi Jason,
> >
> > I really appreciate your help about the problem that I got. The info
> > related to the GNURadio and the USRP that I'm using is listed in the
> > following.
> >>
> >> Please confirm that you just see the carrier, not your modulated
> >> signal when using the lock()/unlock()
> >
> > I checked the result of using lock()/unlock() by correlating the down
> > converted signal with the Barker code, at the transmission pause interval,
> > there is no correlation peak. Therefore, it turned out there is no code
> > transmitted during the transmission pause interval. Is it a right way to
> > test if there is Barker code transmitted during the transmission pause
> > interval? Is lock/unlock working for completely turning off the signal
> > transmission for 5ms? However, I'm sure when using lock/unlock method
> > still gives at least carrier signal in the pausing interval, which is
> > observed on the oscilloscope.
> >
> >>
> >> Also, please tell us:
> >>
> >> What version of GNUradio are you using?
> >
> > The version of GNUradio that I'm using is GNURadio 3.2svn
> >
> >>
> >> What hardware are you using? USRP? which daughterboard?
> >
> > I'm using USRP1 with LFTX daughterboard plug-in. (similarly, at the
> > receiver side,USRP1 with LFRX plug-in is utilized. )
> >
> >>
> >> Are you using UHD?
> >
> > I'm not using UHD.
> >
> > Thank you so much for all of your help!
> >
> > Thanks,
> > Yan
> >
> > begin:vcard
> > n:;
> > adr:;;;;;;
> > version:2.1
> > end:vcard
> >
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > Discuss-gnuradio@gnu.org
> > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> >
> >
>
> --
> View this message in context:
> http://old.nabble.com/how-to-stop-the-top_block-and-restart-signal-transmission-tp30982478p30999857.html
> Sent from the GnuRadio mailing list archive at Nabble.com.
>
>
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