公开(公告)号：US3577100A

公开(公告)日：1971-05-04

申请号：US3577100D

申请日：1969-02-28

Applicant: US ARMY

Inventor： ASKEW ROBERT E ,  JOHNSON HENRY C

IPC: G01W1/08 ,  H03L1/02 ,  H04B1/02

CPC classification number: G01W1/08 ,  H03L1/021

Abstract: This invention relates to a meteorological device that is used to transmit atmospheric conditions such as temperature, pressure, humidity, or the like, to a remote station. The transmitter of such device utilizes temperature-compensating means with a highfrequency transistor oscillator thereby obtaining a highly stable output over a wide temperature range. Temperature compensation is provided by mounting the transistor directly onto dual resonant coaxial cavities with one cavity connected to the transistor emitter and the other cavity connected to the base lead. The cavities are constructed of dissimilar metals thereby providing temperature dependent capacitance. The cavities are provided with sets of adjusting screws to provide for adjustments in cavity resonance brought about by both lateral and transverse unequal expansion in the cavities.