National Instruments 781911-01

The National Instruments 781911-01, also known as the USRP-2932, is a highly versatile software-defined radio (SDR) device tailored for diverse communication applications, including Wi-Fi, WiMax, and ISM band communications. It is equipped with a single input and output channel that can be tuned via LabVIEW software utilizing the NI-USRP instrument driver. The device covers an extensive frequency range from 400 MHz to 4.4 GHz, making it suitable for various wireless systems. The transmitter features fine frequency tuning with a step size of less than 1 kHz and delivers an output power ranging from 50 mW to 100 mW (17 dBm to 20 dBm), with an adjustable gain range from 0 dB to 31 dB in 0.5 dB increments. It supports a maximum instantaneous bandwidth of 40 MHz at an 8-bit sample width or 20 MHz at a 16-bit sample width, with I/Q sampling rates of up to 50 MS/s for 8-bit samples and 25 MS/s for 16-bit samples.

The receiver mirrors the transmitter's frequency coverage and offers a gain range of 0 dB to 31.5 dB with a 0.5 dB step, accommodating a maximum input power of 0 dBm and featuring a noise figure between 5 dB and 7 dB. The real-time bandwidth capabilities are consistent with the transmitter, supporting 20 MHz at a 16-bit sample width and 40 MHz at an 8-bit sample width. The receiver's analog-to-digital converter (ADC) provides dual channels with 14-bit resolution and a sampling rate of 100 MS/s. Operating at a maximum power consumption of 18 W, the device typically requires between 12 and 15 W through an external DC power source. The compact dimensions of the 781911-01 are 15.875 cm × 4.826 cm × 21.209 cm (6.25 in. × 1.9 in. × 8.35 in.), and it weighs 1.193 kg (2.63 lb). Additionally, this SDR is equipped with a GPS Disciplined Oscillator (GPSDO), ensuring precise frequency control with a frequency accuracy of 25 ppb when not GPS-synchronized, improving to 10 ppb when connected to GPS. The active antenna utilized by the device necessitates 0.7 W (5 V) of power, enhancing its operational flexibility.