niUSRP Configure Signal

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

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.

Inputs/Outputs

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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

Default value: 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

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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.

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

Antenna Names

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