Re: [Discuss-gnuradio] Question about USRP2 Tx procedure

2012-04-25 Thread Josh Blum
On 04/25/2012 11:53 AM, mle...@ripnet.com wrote: > > > Oooh, is there a configurable parameter for that in GRC yet? > Not yet. It would fit well in the options block. Pretty easy to add, but it would be a little more change to get the parameter into the WX gui top block class. Qtgui and no

Re: [Discuss-gnuradio] Question about USRP2 Tx procedure

2012-04-25 Thread mleech
Oooh, is there a configurable parameter for that in GRC yet? On Wed, 25 Apr 2012 11:33:34 -0700, Josh Blum wrote: > Also, I want to point out: > There is a hook to control the size of these buffers in gnuradio > (presumably to reduce flow graph latency). You may be interested in > modifying

Re: [Discuss-gnuradio] Question about USRP2 Tx procedure

2012-04-25 Thread Josh Blum
> Dear josh, > > Thanks for your help very much! > > But I still have puzzles about the extra time such as 0.65s when > I set the bit rate to 1M. we set the program to send 4s, and use > wireshark and find the data through the network card continued for > 4.65s, it indicates that the data be

Re: [Discuss-gnuradio] Question about USRP2 Tx procedure

2012-04-25 Thread baobaonanpo D
>> 3. Considering that we only need 650ms, no matter how long we >> send(like 10s or more). We guess there is a fixed size cache in the >> usrp and it send the cached data at a precise-controlled time, but I >> can not persuade myself. >> Can anyone interpret the strange phenomenon? Any suggest

Re: [Discuss-gnuradio] Question about USRP2 Tx procedure

2012-04-14 Thread Pan, Luyuan
original mail-- Message: 11 Date: Fri, 13 Apr 2012 08:25:36 -0700 From: Josh Blum To:discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Question about USRP2 Tx procedure Message-ID:<4f884570.5010...@ettus.com> Content-Type: text

Re: [Discuss-gnuradio] Question about USRP2 Tx procedure

2012-04-13 Thread Josh Blum
On 04/13/2012 08:36 AM, Nowlan, Sean wrote: > A few questions about this: can you wait on the uhd async message > queue from a python script that has an instance of top_block? Would > you have to override wait() with a custom version that waits on the > queue (haven't checked if wait is a virtual

Re: [Discuss-gnuradio] Question about USRP2 Tx procedure

2012-04-13 Thread Nowlan, Sean
t: Re: [Discuss-gnuradio] Question about USRP2 Tx procedure On 04/13/2012 06:54 AM, Pan, Luyuan wrote: > Hi everyone, > I now have some trouble in understanding how the usrp2 sent out > the data. My scenario of the test is: > We tried to control the usrp2 to transmit in a fixe

Re: [Discuss-gnuradio] Question about USRP2 Tx procedure

2012-04-13 Thread Josh Blum
On 04/13/2012 06:54 AM, Pan, Luyuan wrote: > Hi everyone, > I now have some trouble in understanding how the usrp2 sent out the > data. My scenario of the test is: > We tried to control the usrp2 to transmit in a fixed time slot, such as > 5 seconds. The code is: > tb = usrp.transmit_path

[Discuss-gnuradio] Question about USRP2 Tx procedure

2012-04-13 Thread Pan, Luyuan
Hi everyone, I now have some trouble in understanding how the usrp2 sent out the data. My scenario of the test is: We tried to control the usrp2 to transmit in a fixed time slot, such as 5 seconds. The code is: tb = usrp.transmit_path() # Create the path t1 = time.time() tb