The Drake model R-4B is a double conversion superheterodyne receiver, with preselector, designed for optimum reception of all types of amateur radio communications. It gives complete coverage of the 80, 40, 20, and 15 meter bands, as well as the portion of the 10 meter band from 28.5 MHz to 29.0 MHz. Additional coverage between 1.5 and 30 MHz is possible using accessory Crystals. A linear permeability-tuned solid state VFO and premixed injection from a crystal-controlled high frequency oscillator give excellent stability on all bands. A crystal calibrator provides accurate frequency checkpoints at 25 KHz intervals throughout the usable range of the receiver. Selectivity may be varied with the passband tuner-filter which has four selectivity positions. Noise blanking and AVC action are controllable from the front panel.