USRP Radio Parameters and Supported Ranges

Since R2026a

To configure USRP™ radios, you need to set the parameters of these System objects and blocks so that the hardware can tune and transmit or receive the signals.

• comm.SDRuTransmitter

• comm.SDRuReceiver

• SDRu Transmitter

• SDRu Receiver

This topic lists the key parameters of USRP radios supported by Wireless Testbench™ Support Package for NI™ USRP Radios and shows valid ranges for each USRP radio series.

Center Frequency

Center frequency is the frequency at which the USRP radio transmits or receives signals. The center frequency value depends on the RF daughterboards supported by each USRP radio.

USRP Radio Series	Valid Range (Hz)
USRP E320	70 MHz to 6 GHz
USRP N300 and USRP N310	10 MHz to 6 GHz
USRP N320 and USRP N321	3 MHz to 6 GHz
USRP X3xx Series	The center frequency value for X3xx series radios varies depending on the RF daughterboard.
USRP X410	1 MHz to 7.2 GHz

For USRP X3xx series radios, the center frequency value depends on the RF daughterboard.

RF daughterboard	Valid Range (Hz)
LFRX	0 to 30 MHz
LFTX	0 to 30 MHz
SBX	400 MHz to 4.4 GHz
WBX	50 MHz to 2.2 GHz
UBX	10 MHz to 6 GHz
CBX	1.2 GHz to 6 GHz
TwinRX	10 MHz to 6 GHz
TVRX	50 MHz to 860 MHz
TVRX2	50 MHz to 860 MHz

Gain

Gain determines the level of amplification applied to the signal. Increasing gain boosts the signal strength, which can improve reception of weak signals but may also introduce noise or distortion if set too high. Lower gain reduces amplification, which can help avoid saturation but may make the signal too weak for accurate processing. Choosing the right gain ensures a balance between signal quality and noise performance. The gain value depends on the RF daughterboards supported by each USRP radio.

USRP Radio Series	Rx Gain Valid Range (in dB)	Tx Gain Valid Range (in dB)
USRP E320	0 to 76 dB	0 to 89.8 dB
USRP N300 and USRP N310	0 to 25 dB (10 MHz to 300 MHz) 0 to 20 dB (300 MHz to 6 GHz)	0 to 25 dB (10 MHz to 300 MHz) 0 to 20 dB (300 MHz to 6 GHz)
USRP N320 and USRP N321	0 to 60 dB (1 MHz to 6 GHz)	0 to 60 dB (1 MHz to 6 GHz)
USRP X3xx Series	The gain value for X3xx series radios varies depending on the RF daughterboard.
USRP X410	0 to 60 dB	0 to 60 dB

For USRP X3xx series radios, the gain value depends on the RF daughterboard.

RF daughterboard	Rx Gain Valid Range (in dB)	Tx Gain Valid Range (in dB)
SBX	0 to 31.5 dB	0 to 31.5 dB
WBX	0 to 31.5 dB	0 to 31.5 dB
UBX	0 to 31.5 dB	0 to 31.5 dB
CBX	0 to 31.5 dB	0 to 31.5 dB
TwinRX	0 to 93 dB	0 to 93 dB
TVRX	RF: -13.3 to 50.3 dB (frequency-dependent) IF: -1.5 to 32.5 dB	-
TVRX2	0 to 30 dB	-

Master Clock Rate

Master clock rate is the base hardware clock that determines the radio’s internal sampling and conversion rates. USRP radios transmit and receive waveforms at a sample rate of MCR divided by a supported decimation or interpolation factor, where MCR is the master clock rate.

USRP Radio Series	Valid Range (Hz)
USRP E320	200 kHz to 61.44 MHz Note When you use a USRP E320 radio with two transmit channels, the clock rate must be less than or equal to 30.72 MHz. This restriction is a hardware limitation for two-channel operations on USRP E320 radios.
USRP N300 or N310	122.8 MHz 125 MHz 153.6 MHz
USRP N320 or N321	200 MHz 245.76 MHz 250 MHz
USRP X300 or X310	184.32 MHz 200 MHz
USRP X410	245.76 MHz 250 MHz

Decimation Factor or Interpolation Factor

Decimation and interpolation factors control how the radio scales the master clock rate to achieve the requested sample rate.

USRP Radio Series	Decimation Factor Valid Range	Interpolation factor Valid Range
USRP E320	1 2 3 Even integer in the range [4,256] Multiple of 4 in the range [256,512] Multiple of 8 in the range [512,1016]	1 2 3 Even integer in the range [4,256] Multiple of 4 in the range [256,512] Multiple of 8 in the range [512,1016]
USRP N3xx Series	1 2 3 Even integer in the range [4,256] Multiple of 4 in the range [256,512] Multiple of 8 in the range [512,1016]	1 2 3 Even integer in the range [4,256] Multiple of 4 in the range [256,512] Multiple of 8 in the range [512,1016]
USRP X3xx Series	Integer in the range [1,128] Even integer in the range [128,256] Multiple of 4 in the range [256,512] Multiple of 8 in the range [512,1016]	Integer in the range [1,128] Even integer in the range [128,256] Multiple of 4 in the range [256,512] Multiple of 8 in the range [512,1016]
USRP X410	1 2 3 Even integer in the range [4,256] Multiple of 4 in the range [256,512] Multiple of 8 in the range [512,1016]	1 2 3 Even integer in the range [4,256] Multiple of 4 in the range [256,512] Multiple of 8 in the range [512,1016]