Re: [Discuss-gnuradio] USRP2 benchmark_rx.py, benchmark_tx.py, transmit_path_usrp2.py, receive_path_usrp2.py, pick_bitrate.py

[Matt Ettus]

The DAC rate is 100e6.  The "bitrate" is the desired data rate of the 
over the air modulation.  It should be MUCH less, like 100k to 1M or so.

There is absolutely nothing in any of the systems for which 200e6 is a 
correct choice.

Matt

Smith L. wrote:
> Hi,
>
> I already tried to set the value of the converter_rate in pick_tx_bitrate
> and Pick_rx_bitrate according to the ADC and DAC specifications of 
> address@hidden I
> set it to 200e6 in pick_tx_bitrate and in pick_rx_bitrate. But even that did
> not worked. I am confused with how to modify the pick_bitrate.py file for
> usrp2. I am not able to determine the different parameters that I need to
> provide for usrp2. If anyone has already worked on it then please help me to
> modify the pick_bitrate file for usrp2. Also if any other changes are
> required in other python files.
>
> Thanks in advance.
>
> Smith
>
>
> Eric Blossom wrote:
> > On Fri, Apr 17, 2009 at 11:24:00AM -0700, Smith L. wrote:
> > > I am using the same pick_bitrate.py file that is already provided in
> > > gnuradio. As it can be seen that both usrp systems have the default bit
> > > rate
> > > irrespective of whether it acts as receiver or transmitter. My concern is
> > > with the interpolation and decimation. Do I need to make changes to the
> > > pick_bitrate.py file for USRP2? If yes, then what kind of changes. I also
> > > observed that even though USRP2 shows a bit rate of 500kbps, however I
> > > believe that its transmitting too fast which does not allow USRP1 to
> > > receive
> > > correctly.I would greatly appreciate any help in this matter.
> > At a minimum, you will need to call pick_tx_bitrate and
> > pick_rx_bitrate providing proper rates for the ADC and DAC.  They
> > default to the values appropriate for the USRP1.  However, it looks
> > like you'll need a USRP2 version since they encode the acceptable
> > ranges for interpolation and decimation which are different between
> > the USRP1 and USRP2.
> >
> > Eric
> >
> >
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