Problems after upgrading to UHD with USRP2

Hello all,

We recently upgraded to the UHD drivers, and now some basic stuff we had
working with the older drivers just isn’t working anymore. For example,
I’m just trying to transmit and receive a raised cosine pulse, but I’m
not getting anything at the receiver. I’ve eliminated all warnings that
I was getting, to no avail. We’re using USRP2s with the RFX2400
daughterboards.

I’m attaching 2 GRC files as examples of what we’re doing. I’m not
getting any received signal. Any idea what I’m doing wrong.

thanks,

-Sam K.

On 10/25/2011 12:53 PM, Sam K. wrote:

getting any received signal. Any idea what I’m doing wrong.

What version of UHD? Can you repeat the experiment with a higher
sampling rate? Also, make sure that filter isnt outputting more than
magnitude 1.0/

-josh

Hi,

The issue was the gain on the USRP2 UHD block in GRC was 0dB. I had to
put it way up and then we got the signal again. Just curious however,
With the previous USRP2 block(pre-UHD), 0 dB gain worked fine. Is there
some change I’m not aware of?

thanks,

-sam

On 10/25/2011 12:53 PM, Sam K. wrote:

Hello all, > >We recently upgraded to the UHD drivers, and now some basic stuff
we >had working with the older drivers just isn’t working anymore. For >example,
I’m just trying to transmit and receive a raised cosine >pulse, but I’m not
getting anything at the receiver. I’ve eliminated >all warnings that I was
getting, to no avail. We’re using USRP2s with >the RFX2400 daughterboards. > >I’m
attaching 2 GRC files as examples of what we’re doing. I’m not >getting any
received signal. Any idea what I’m doing wrong. > What version of UHD? Can you
repeat the experiment with a higher
sampling rate? Also, make sure that filter isnt outputting more than
magnitude 1.0/ -josh

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