FIXED FREQUENCY OSCILLATOR

摘要

PURPOSE:To obtain a frequency fine controller having the satisfactory mass production properties without using a large dielectric matter, by grounding an end of a strip line by the resonance capacity with the other end opened and changing the size of a gap formed between a pattern near the open end and a control screw for earth potential in order to perform the rough control of frequency before a shielding cover is used. CONSTITUTION:The fine control of the oscillation frequency of a fixed frequency oscillator is carried out by controlling the capacity produced in a gap 23 formed between a pattern of a strip line 14 and a control screw 20 which is provided to a conductor plate 19 held between the side faces of a shielding plate 18 and a housing 17 and serves as an earth potential. Thus the rough control is possible with the oscillation frequency before a shielding cover is used. The variation of the oscillation frequency is reduced with use of the shielding cover. This also reduced the thickness of the shielding cover.