The development of a very low phase noise missile Frequency Reference Oscillator for use in a powered free flight configuration required the utilization of low vibration sensitivity SC cut crystals and custom designed hybrids. Three separate frequencies in the VHF range are synthesized from a crystal controlled Butler oscillator operating at approximately 60 MHz. Tight mechanical packaging constraints require the use of special vibration isolators to minimize phase noise during the mission. Three hybrids were developed for the application. Two of them are VHF frequency multipliers and the third provides a voltage regulation/ECL driver function. Incorporation of these hybrids in the final design results in a package volume of approximately five cubic inches. To insure low phase jitter during vibration, all of the crystal undergo vibration screening. The screening applies a sinewave to the three orthogonal axes while the sideband level is monitored. Two crystal resonators are used in each synthesizer; one in the oscillator and another in a narrowband crystal filter which reduces phase noise to a level of -161 dBc/Hz, 8 kHz from the carrier. The two crystals are matched in temperature turning point to insure proper system performance.
Development of a low 'G' sensitivity missile clock
Die Entwicklung eines vibrationsunempfindlichen Taktgebers fuer Raketen
1984
4 Seiten, 8 Bilder
Aufsatz (Konferenz)
Englisch
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