The transmitter section contains a directly modulated VCO and RF power amplifier (PA). Internal, dual, high-performance phase locked loop (PLL) synthesizers and VCOs allow full duplex or half-duplex operation over the entire RF tuning range. MXR-NT924/25 provides a high level of integration, with high performance operation and low power consumption. The MXR-NT924/25 operates over an industrial temperature range of -20C to +65C and over the supply voltage range of 2.7 to 16 VDC.

A quadrature mixed, direct-conversion, zero intermediate frequency (Zero-IF) approach is used for the receiver section. After quadrature down-conversion to baseband and filtering, a quadrature mixer up-converts the complex signal to an intermediate frequency (IF) for demodulation. The transmitter section of the MXR-NT924/25 is comprised of a modulation input circuit, a PLL synthesizer / VCO, and a RF power amplifier (PA) capable of providing -5 dBm into a 50 ohm load.