The PHAZAR, a recently introduced interference reduction system eliminates the need to know the direction of the off-the-air interference source, and in most cases makes the application of an auxiliary antenna unnecessary. A sequential manipulation of the controls will result in a 20 to 30 dB interference rejection.
In this paper the authors give a brief summary of the conventional interference rejection methods used before. Than, using block diagrams and phasor charts, the authors describe the theory and operation of the PHAZAR SYSTEM "A".
Finally, the interference rejection capabilities of the PHAZAR will be demonstrated simulating harmonic type and co-channel interference conditions.