Abstract: A high performance logic family for GaAs Enhancement/Depletion mode MESFETs is disclosed. The inventive logic family exhibits a large noise margin with little sacrifice in speed/power performance.

Abstract: To form a universal electrical cabinet that can be assembled without conventional fasteners, the side sections of a U-shaped member each have an outwardly-extending flange that abuts a corresponding outwardly-extending flange on the side sections of an inverted U-shaped member, with the central sections of the U-shaped member and inverted U-shaped members forming the bottom and top of the cabinet respectively and the side sections combining to form two sides of the cabinet. Tracks or grooves along the front and the rear of the U-shaped and inverted U-shaped members receive front and rear panel members for the cabinet, with the front member having the dials and meters and the like and the rear member generally having electrical connectors. Elongated C-shaped members fit over the flanges where they abut to hold the side sections together so as to form a cabinet. Printed circuits and the like are mounted within the cabinet by suitable abutments and ridges in the U-shaped and inverted U-shaped members.

Abstract: To scan channels in a plurality of bands using a single first mixer, an FET transistor in an adaptive first mixer of the scanning radio, in response to a signal from a counter in the scanning local oscillator representing the frequency band of the channel being scanned, has: (1) its gate electrode connected to the output of a selected RF amplifier of a plurality of RF amplifiers for different bands; and (2) its source electrode electrically connected to receive local oscillations through a selected one of a plurality of different impedance networks. These connections enable the adaptive first mixer to maintain sufficiently high conversion gain when receiving signals on channels in any one of a plurality of different frequency bands.