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California Amplifier


, a maker of microwave telecommunication equipment, was down 23.2% in preopen


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trading after it said fourth-quarter earnings would be 6 to 7 cents per share, missing the

First Call/Thomson Financial

estimate of 8 cents.

The company had already issued a warning about the fourth quarter in early December. California Amplifier also said first-quarter sales and earnings would be below fourth-quarter levels.