RESULTS ARE PRESENTED OF OBSERVATIONS OF COMPACT COMPONENTS OF QUASARS AND CORES OF RADIO GALAXIES USING A RADIO INTERFEROMETER WITH AN ANGULAR RESOLUTION LIMIT. THE MEASUREMENTS WERE MADE AT 3.55 CM BY THE ULTRA-LONG INTERFEROMETRY METHOD, WITH THE 22-METER RADIO TELESCOPE OF KAO, ACADEMY OF SCIENCES, USSR, THE 42-METER NRAO (USA) AND 64-METER NASA (USA) RADIO TELESCOPES. THE COMPACT COMPONENTS ARE IN MOST CASES COMPLEX IN STRUCTURE. MANY COMPONENTS HAVE ANGULAR DIMENSIONS LESS THAN 0.00025 IN. AND LINEAR DIMENSIONS 2 LIGHT-MONTHS. THEIR TEMPERATURE BRIGHTNESS EXCEEDS 10 TO THE 12TH POWER K. THE TEMPERATURE BRIGHTNESS OF THE RESOLVED COMPONENTS LIES BETWEEN 10 TO THE 11TH POWER - 10 TO THE 12TH POWER K.