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What is the difference between the VIR-30A and VIR-31A -001 vs. -011 versions?

April 26, 2017versions vir-30a vs

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What is the difference between the VIR-30A and VIR-31A -001 vs. -011 versions?

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The -011 versions incorporate a rotor modulation modification on the VOR instrumentation circuit card This modification includes an RC filter at the outputs of the sine/cosine DC signals that smooths these outputs to minimize the effects of interference by rotor action of a helicopter.