GNU Radio Companion USRP Transmitter Example

GNU Radio
1

Does anyone have an .xml file that shows an example of doing this?
Currently, I have a USRP sink with the following parameters and I cant
get
any signals on my Rx USRP. I know my Rx USRP is working as I can run
the
gnuradio ptt example and I can see energy appearing on the PSD.

Here are my USRP Sink parameters:
Input type: complex
usint #: 0
subdev spec: side B
freq: 25000000
gain 3200
mux 0x0
auto t/r : ignore
tx enable: enable
interp: 400

The input to the sink is a cosine wave at 10000 with amplitude 100.

Thanks in advance.

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2

No luck. Can you send me an example xml schema for a transmitter that
you
know works?

Thanks in advanced,
Isaac

Josh B. wrote:

Here are my USRP Sink parameters:
The input to the sink is a cosine wave at 10000 with amplitude 100.

–
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3

Thanks Josh,
Its the end of the work day here… so i am going to take off. I will
try it first thing. The GRC I am using is from the trunk so ill just
recheck it tommorrow. I am using the basic Tx and basic Rx.

Isaac

Josh B. wrote:

isaacgerg wrote:

usint #: 0
Thanks in advance.

Im not sure about the board you are using, but the actual allowed
gain parameter is way less than 3200. Set the usrp gain to 0, and try
a amplitude of 5000 for the signal source.

-Josh

–
[email protected] - Sr Systems Engineer
Voice: 814-278-3019

4

Josh,
I just rechecked out grc from the repository. Your two tone example
did not work right out of the box as I had to set some of the Sink and
Source settings, mostly the A:0 B:0 stuff… I found out what my
problem was. My Tx antenna is hooked up to TxA, but in the subdev Spec
for the sink, I had it set set to SideB. Its working great now!

Thanks for example, that really made it easy to debug all the parameters
quickly to find the problem.

Thanks!
Isaac

Josh B. wrote:

isaacgerg wrote:

usint #: 0
Thanks in advance.

Im not sure about the board you are using, but the actual allowed
gain parameter is way less than 3200. Set the usrp gain to 0, and try
a amplitude of 5000 for the signal source.

-Josh

–
[email protected] - Sr Systems Engineer
Voice: 814-278-3019