UHD probe problem

GNU Radio
1

Hi List,

I have been working in an example of gnuradio with UHD.
Here it is the grc:

https://plus.google.com/photos/101968292957887487468/albums/5743245621972588801?authkey=CMKp-emyy9fslgE#photos/101968292957887487468/albums/5743245621972588801/5743245621289328226?authkey=CMKp-emyy9fslgE
https://picasaweb.google.com/101968292957887487468/CosenoUHD#5743245621289328226

So, How you can see, I am transmitting a cosine with an specific
frequency
using UHD source-sink blocks. I hpe to see an aproximation of the cosine
signal with the same frequeny at the receiver

This is the scope at the receiver:

https://picasaweb.google.com/101968292957887487468/CosenoUHD#5743245631651319906

We are obtaining a different frequency in the cosine signal at the
receiver. Anyone knows why is this happening?
Am I doing anything wrong?

Thanks in advance.
Javier M.

2

On Fri, 18 May 2012 09:54:30 -0500, Javier M. Suarez wrote:

Hi
List,

I have been working in an example of gnuradio with UHD.

Here it is the grc:

[1]
https://picasaweb.google.com/101968292957887487468/CosenoUHD#5743245621289328226
[2]

So, How you can see, I am transmitting a cosine with an
specific frequency using UHD source-sink blocks. I hpe to see an
aproximation of the cosine signal with the same frequeny at the
receiver

This is the scope at the receiver:

https://picasaweb.google.com/101968292957887487468/CosenoUHD#5743245631651319906
[3]

We are obtaining a different frequency in the cosine signal
at the receiver. Anyone knows why is this happening?
Am I doing
anything wrong?

Thanks in advance.
Javier M.

Frequency offset,
most likely. Depending on which platform you’re using, carrier frequency
precision is 25PPM or 5PPM.

Links: