-- card: 100895 from stack: in
-- bmap block id: 0
-- flags: 4000
-- background id: 7720
-- name: #328
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on openCard
  global group,rightone
  put 31 into group
  put "D" into rightone
  pass openCard
end openCard



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Question #31

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4BG-4B.10 How can selectivity be achieved in the IF circuitry of a communications receiver?

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Incorporate a means of varying the supply voltage to the local oscillator circuitry

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Replace the standard JFET mixer with a bipolar transistor followed by a capacitor of the proper value

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Remove AGC action from the IF stage and confine it to the audio stage only

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Incorporate a high-Q filter

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Correct answer is D