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Which of the following is not a challenge to RF/IF conversion stage in military application?

Which of the following is not a challenge to RF/IF conversion stage in military application? Correct Answer Single RF/IF up-down conversion

Tunable pre-selector is required for co-site rejection. Low phase noise and fast tuning synthesizers are required for JTIDS and EPLRS. Single RF/IF up-down conversion is a commercial application challenge.

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