Table Of Contents

niUSRP Configure Signal (G Dataflow)

Last Modified: July 16, 2018

Configures properties of the transmit (Tx) or receive (Rx) signal.

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Note  

The USRP devices are not calibrated. The gain value does not represent an absolute gain and does not have linear behavior. Different devices exhibit different gain curves for different carrier frequencies. You may need to experiment to determine the correct gain setting for your application.

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session handle

Instrument session.

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

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IQ rate

Rate of the baseband I/Q data in samples per second (S/s).

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carrier frequency

Carrier frequency, in Hz, of the RF signal.

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gain

Aggregate gain, in dB, applied to the RF signal.

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channel list

Channels to configure.

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active antenna

Antenna port to use for this channel.

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session handle out

Reference to your instrument session to be passed to the next node.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.
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coerced IQ rate

Actual I/Q rate, in samples per second (S/s), for this session, coerced to a value supported by the device.

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coerced carrier frequency

Actual carrier frequency, in Hz, for this session, coerced to a value supported by the device.

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coerced gain

Actual gain, in dB, for this session, coerced to a value supported by the device.

Antenna Names

Use internal or connector names to refer to device antennas. The connector names correspond to the connectors on the device front panel. For Ettus Research devices, use internal names to refer to the internal connectors inside the device case.
Table 1. Antenna Names
USRP Device Connector Name PCB (Internal) Name
USRP-2900/2901/2920/2922/2930/2932 TX1, RX1 TX/RX
RX2 RX2
USRP-2921 RX1, TX1 J1
RX2, TX2 J2
USRP-2940/2942/2943/2944/2950/2952/2953/2954/2974 TX1, RX1 TX/RX
RX2 RX2
USRP-2945/2955 RX1 RX
RX2 RX2

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application

Hardware Support:

This node supports the following hardware:

  • USRP-2900/2901
  • USRP-2920/2921/2922
  • USRP-2930/2932
  • USRP-2940/2942/2943/2944/2945
  • USRP-2950/2952/2953/2954/2955


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