Digital two frequency generator for use in borehole heterodyne m

Details Digital two frequency generator for use in borehole heterodyne m Digital two frequency generator for use in borehole heterodyne m

1993-04-08

1996-08-20

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324 7641, 327106, 327113, 327129, 327184, 327355, G01V 330, H03B 1900, H03B 2101, H03K 302

Patent

active

055482198

ABSTRACT:
A system for generating two or more frequencies for a borehole heterodyne measurement system for use in measuring electromagnetic propagation properties of rock is disclosed. A precision clock oscillator supplies a binary counter with clock signals. The output of the binary counter is supplied as address information to one or more pre-programmed ROMs. The ROMs are used to store multiple cycles of desired output signals. Output signals from the counter may also be supplied as square wave local oscillator signals in the system.

REFERENCES:
patent: 4185238 (1980-01-01), Huchital et al.
patent: 4300098 (1981-11-01), Huchital et al.
patent: 4499422 (1985-02-01), Sinclair
patent: 4774471 (1988-09-01), Sims et al.
patent: 4810970 (1989-03-01), Warren et al.

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