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

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

(a) Low phase noise

(b) Tunable pre-selector

(c) Single RF/IF up-down conversion

(d) Fast tuning synthesizers

The question was asked in an interview for job.

The origin of the question is RF and IF Processing Tradeoffs in portion Technology Tradeoffs in Software Defined Radio of Cognitive Radio

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Best answer
The correct answer is (c) Single RF/IF up-down conversion

To elaborate: 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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