This YIG-tuned receiver front end builds on digitally controlled YIG filter technology to provide a broad and stable tuning range based on YIG oscillators. The resultant integrated technology provides state-of-the-art RF to IF subsystems in compact packages designed for military environments. It features closed-loop tracking of the LO and preselector and is compensated for fast settling time and increased tuning speed. Preselector tracking is +/-2 MHz, tracking repeatability is +/-0.5 MHz, IF frequencies are 25 to 300 MHz, IF bandwidths are 5 to 50 MHz, and RF-to-IF gain is 0 to 20 dB. In addition, flatness versus frequency is +/-2.5 dB, and variation with temperature is 2.0 dB. The unit is suited for EW, radar warning receivers, ECM and ESM systems, integrated RF front ends, superheterodyne receivers, and downconverters.