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What does a receiver's blocking specification describe?

  • A.Rejection of the image frequency
  • B.The level at which the squelch closes
  • C.The attenuation of the intermediate frequency at the antenna
  • D.Desensitisation by a strong nearby signal

Answer: D

Blocking is the reduction in gain a wanted weak signal suffers when a strong signal is present nearby in frequency, and it is a large-signal property of the front end and mixer. Image rejection is a separate specification. Squelch threshold concerns muting. And intermediate frequency leakage at the antenna is a radiation matter. Weak-signal and strong-signal specifications describe different failure modes, and a receiver can be excellent at one and poor at the other.

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