A 10-foot diameter direction-finding antenna for detecting interference is mounted on top of the radio telescope towers. An 8-level tape punch system has been developed to digitize the analog output of the radiometer of the radio telescope. The system consists basically of a shaft encoder which digitizes the analog output at the recorder, an associated relay circuit which controls the timing of readouts and also supplies functional informations to be punched onto the tape along with the regular data entries, and the tape punch itself. A circuit for automatic gain reduction on the Daystrom recorder was added to the radiometer. The activation of this circuit is controlled by the digital sidereal clock and is programmed so that it is turned on during crossings of the Galaxy. This is done to prevent the recorder going off scale. In this way scans of the Galaxy at the various declinations will be preserved and can be reduced later should contour maps of the Galaxy be required.