Re: [Discuss-gnuradio] how to stop the top_block and restart signal transmission

[Yan Nie]

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 

On 02/23/11, Guanbo <address@hidden> 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
>
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