Method and apparatus for selectively fine-tuning a coupled-dual

Details Method and apparatus for selectively fine-tuning a coupled-dual Method and apparatus for selectively fine-tuning a coupled-dual

1986-04-11

1987-06-30

Newsome, John H.

Coating processes

Measuring, testing, or indicating

Thickness or uniformity of thickness determined

29 2535, 427100, H04R 1700, C23C 1600

Patent

active

046769935

ABSTRACT:
A dual-coupled resonator crystal is fine-tuned by frequency balancing the input and output resonators and thereafter plating a coupling adjust spot on the grounded side shadowing the unelectroded region of the front side of the crystal to produce a change in synchronous peak separation frequency. Thereafter, the front side electrodes are sequentially plated to bring plateback and synchronous peak separation frequency to their target values. Interim adjustments in synchronous peak separation frequency may be made during the tuning process to compensate for misalignment of the plating elements.

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