AUTOMATIC TUNING SYSTEM FOR HYDROGEN MASER

摘要

PURPOSE:To enable to smoothly perform the tuning control with a hydrogen maser oscillating frequency by a method wherein a differential signal detected by the beat period measuring instrument is compared with the error discrimination set value, which has been previously prescribed, and a control circuit, which has a function to judge whether or not the differential signal is fitting and performs the processing, is provided. CONSTITUTION:The amount of hydrogen beams is alternately changed-over to a high amount and a low amount according to programs, which are sent from a control circuit 35A, and after the differential signal DELTAfm of the maser oscillating frequency DELTAfm was detected by a beat period measuring instrument 34, the differential signal DELTAfm and the error set value DELTAe are compared to each other. When the differential signal DELTAfm is smaller than the error set value DELTAe, the differential signal DELTAfm is stored in a memory part 35B and the capacity value of a varactor diode 21 is set at a variable capacity value by a control signal, which corresponds to the differential signal DELTAfm. However, when the differential signal DELTAfm outputted from the beat period measuring instrument 34 is larger than the error set value DELTAe, the latest differential signal DELTAfm (M) being stored in the memory part 35 is made in such a way to output.