A PULSE INTERFERENCE BLANKER
GEORGIA INST OF TECH ATLANTA ENGINEERING EXPERIMENT STATION
Pagination or Media Count:
An interference blanker is described which is effective in overcoming the overloading and desensitization of conventional communication equipment due to interference from high-powered pulse-type equipment, such as radar. This device was designed to permit the suppression of the pulse interference directly at the input terminals to a communication receiver without any internal modification. The blanker uses the gating technique with 1 the receiver turned off for the duration of each interfering pulse and turned on again by the pulses, and 2 the input signal at a rate high enough to reconstruct all the essential information in the desired signal from the knowledge of the samples alone. Results indicated the need for a switch which can be controlled by the blanking pulses to effect a rapid disconnection of the receiver from its antenna so as to prevent interfering pulses from entering the receiver. The switch must be capable of a very low minimum insertion loss so as not to unduly attenuate low-level desired signals. This blanker is concluded to be excellent in protecting the equipment from pulse interference.