The DRAKE R-4A is an extremely versatile communication receiver designed to bring you every feature desirable for the ultimate in the reception of all modes of amateur communications. It provides a linear permeability-tuned solid state VFO with 1 KC readability, and premixed injection with crystal controlled high frequency oscillator for stability on all bands. A 100 KC crystal calibrator is built-in. An improved passband tuner/filter with four selectivity positions, and a built-in notch filter are incorporated to provide the desired selectivity and interference rejection, and a noise blanker is built-in for elimination of most noise on CW, SSB and AM. As supplied, the unit gives complete coverage of 80, 40, 20, and 15 meter bands as well as the 28.5 MC to 29 .O MC portion of 10 meters. Ten accessory crystal sockets are provided for coverage of other 500 KC frequency ranges between 1.5 and 30 MC such as 160 Meters, MARS frequencies, WWV, short wave broadcast, etc. These sockets can be programmed to give up to 5 MC of continuous coverage for convenient use with V. H. F. converters. The R-4A also includes time proven DRAKE AVC with fast-attack/slow-release for SSB or AM and fast-attach fast-release for CW. If desired, the AVC can be completely disabled for CW reception. Complete AVC action and accurate S-meter indication can be obtained, on all modes. A crystal-lattice filter following the first mixer provides excellent overload characteristics by providing selectivity before gain producing stages. When used with our T-4 Reciter, transceive operation may be obtained, and when used with the T-4X transmitter, either transceive or independent receive and transmit functions are possible.