Complete end to end testing of complex signal processing systems as well as field testing of simple receivers are significantly benefitted by the ability to capture and playback or emulate real world environments. RF receiver testing requires complex hardware and software with the ability to generate signals at the limits of the receiver’s capabilities. At ADS we have developed a family of record and playback units for the range of the spectrum from below 20Hz to above 28Ghz. Our product offerings, under the umbrella of Spectrum Fidelity ZX, range from single channel record or playback units to eight (8) multi-channel phase synchronized units extendable to 3, 64 channels and beyond to emulate complex environments for large signal processing systems. We combine National Instruments Hardware with a comprehensive Software Suite and RF Playback/Record Tool kit to create a COTS out of the box experience.