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Walrus1125
Posts: 5
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Problem of Wideband Spectrum Analysis Example

Hi everyone.

I downloaded the Wideband Spectrum Analysis example and tried it, but it shows no spectrum.

http://www.ni.com/white-paper/13882/en

 

Configuration:

Anritsu Vector Signal Generator MG3700A==> NI USRP2920 (connected to Windows7 PC)

Freq. 10--50MHz

Power 0dBm

 

Is there any suggestion?

Member
ErikL
Posts: 171
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Re: Problem of Wideband Spectrum Analysis Example

The example was designed for use with NI USRP models covering 50 MHz to 2.2 GHZ. Perhaps the software is cohersing the requested center frequency to 50hz for each scan (meaning its not sweeping) rather than returning an error.
Member
Walrus1125
Posts: 5
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Re: Problem of Wideband Spectrum Analysis Example

Hi.

 

I have read your suggestion and I did experiment with the different parameters.  But the trouble has not been solved.  The snapshot is attached, and the error out message is as follows.

 

Is there any suggestion?

---------------------------------

Error Description

Error Status Code -1074118639  HeX Code: 0xBFFA4011

Source:Property Node (arg 5)/subsetupRxHWParameters.vi->subSetParameters(HL).vi->Simplified WB Spectrum Sense (Averaged).vi <ERR> The specified attribute ID is not recognized.

Description Error Code-1074118639 occurs at Property node (arg 5)/subsetupRxHWParameters.vi->subSetParameters(HL).vi->Simplified WB Spectrum Sense (Averaged).vi

Reason:

The specified attribute ID is not recognized.

Active Participant
Sarah_Y
Posts: 230

Re: Problem of Wideband Spectrum Analysis Example

Hi Walrus 1125,

 

What version of the driver are you using?  I'm guessing that you are using version 1.0.  I looked in the subset RxHWParameters.vi block diagram property nodes since that is where the error message indicates the error is coming from.  There is a call to the Active Channel property.  This property is new to the NI-USRP 1.1 driver.  Updating the driver should clear this error. 

 

You can find the 1.1 driver here.

 

After you update the driver, you will also need to update the firmware and FPGA image.  Here is a KB that explains how to do this.

 

Let me know if this doesn't fix the problem, I'd be happy to help.

Sarah Y

Test Engineer
Ettus Research
Member
Walrus1125
Posts: 5
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Re: Problem of Wideband Spectrum Analysis Example

Hi Sarah,

 

I was using NI-USRP 1.0 driver.  So, I updated it to version 1.1, and also updated the firmware and FPGA image.

Your advice solved my problems.

Thanks a lot.

 

Best regards,

Walrus1125

Member
sshearman
Posts: 74
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Re: Problem of Wideband Spectrum Analysis Example

All of the new examples (e.g. http://bit.ly/usrpMIMOExample) posted on the example community require the NI USRP 1.1 driver. Unfortunately, some of the new examples were posted before the driver was released publicly. As Sarah mentioned above, the 1.1 driver is available now, so there shouldn't be too many more concerns. Sorry about any confusion.

 

--Sam

Sam Shearman
Senior Product Manager | Communications & Signal Processing Software | National Instruments
Member
sshearman
Posts: 74
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Re: Problem of Wideband Spectrum Analysis Example

I noticed that the link I gave in my previous response no longer works and points to a dead cartoon fish. You can click it if you'd like to see the fish, or you can go to https://decibel.ni.com/content/groups/ni-usrp-example-labview-vis to actually get to some examples.

 

--Sam

Sam Shearman
Senior Product Manager | Communications & Signal Processing Software | National Instruments
Member
sshearman
Posts: 74
0 Kudos

Re: Problem of Wideband Spectrum Analysis Example

I noticed that the link I gave in my previous response no longer works and points to a dead cartoon fish. You can click it if you'd like to see the fish, or you can go to https://decibel.ni.com/content/groups/ni-usrp-example-labview-vis to actually get to some examples.

 

--Sam

Sam Shearman
Senior Product Manager | Communications & Signal Processing Software | National Instruments