Abstract: Control side equipment and at least one equipment under control are commonly interconnected via a data line and a strobe line. The equipment under control is provided with means for retaining the logic of a strobe pulse when it is received from a strobe line. When the control side equipment has set data on the data line and provided the strobe pulse on the strobe line, the logic hold means of the equipment under control holds the logic of the strobe pulse and the data set on the data line is fetched therefrom into the equipment. Thereafter, the logic hold is released to thereby inform the control side equipment that the equipment under control is ready for receiving the next data. The control side equipment monitors the strobe line and, upon detection of the information, sets new data on the data line and sends out a strobe pulse. Thereafter, similar operations are carried out, by which data are sequentially transferred from the control side equipment to the equipment under control.

Abstract: A tunable YIG band pass filter which can be manufactured with reliably constant characteristics. A housing with slots for receiving insulating plates having a conducting layer on the side edge, and holes for receiving YIG elements over which indentations in the side edges having the conducting layers are located, provides the coupling loops of the filter to the YIG elements. The insulating plates and the YIG elements are fixed at predetermined positions.