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四、分米波三极管振荡器蝶形振荡回路的频率上限约为:1000～1200兆赫,在此频率以上,电子管的屏、阴栅极引线电感,特别是阴极引线电感的影响,将引起不可克服的死点,而开放式振荡回路的幅射也已大到不可容忍的地步.因此,从150～8000兆赫的频率范围内,广泛地采用了同轴谐振腔的振荡器,它具有较高的固有Q值、很低的辐射和谐振回路间妥善隔离的可能性.在采用同轴谐振腔后,一般以灯脚作为引出线的电子管,即使是用于蝶形回路的超高频橡实管,也不能和谐振回路(即同轴谐
Fourth, the decimeter triode oscillator butterfly oscillator frequency upper limit is about: 1000 ~ 1200 MHz, at this frequency, the tube screen, cathode grid lead inductance, especially the cathode lead inductance will cause insurmountable Of the dead-end, and the open-loop oscillation of the radiation has also been intolerable to the extent of.Therefore, from 150 to 8000 MHz frequency range, widely used coaxial resonant cavity oscillator, which has a higher Inherent Q value, very low radiation and the possibility of proper isolation between resonant circuits.After using the coaxial resonant cavity, the lamp is generally used as the lead wire of the tube, even for the butterfly loop UHF rubber tube , And can not and resonant circuit (that is, coaxial harmonic