directional

bethe-hole directional coupler calibrated directional coupler capacitance-loop directional coupler digital directional antenna directional aerial directional aerial or antenna directional angle directional antenna directional baffle directional beam directional bond directional bonds directional case directional characteristic directional circuit breaker directional control directional control valves directional controls directional cosines directional coupler directional couplers directional coupling directional data directional deflector plate directional derivative directional dose equivalent directional drilling directional emissivity directional filter directional floodlight system directional force directional gain directional growth directional gyro directional gyro indicator directional gyroscope directional hemispheric reflectance directional homing directional hydrophone directional hypothesis directional instability directional light directional light(ing) fittings directional lighting directional link directional loop antenna directional loudspeaker directional microphone directional nozzle directional pattern directional phase shifter directional principle directional properties directional radar prediction directional radio directional radio beacon directional radio range directional receiver directional reception directional reference flight directional reflectance directional relay directional response pattern directional road way directional selection directional selectivity directional sensitivity directional separator directional shear directional signal directional signal (indicator) directional solidification directional sonobuoy directional stability directional stabilizer directional supply air directional supply air terminal device directional tariff directional test directional thermal emittance directional thermal remittance directional tire directional transmitter directional traverse directional tread directional verb directional well fixed directional grille loop-type directional coupler one directional pyramidal core one sided directional hypothesis test one tailed directional hypothesis test photoelectric directional counter pop directional formatting two directional input two-hole directional coupling waveguide directional coupler