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Which is the reason the same FM frequency can be reused in another city?

  • A.Transmitters are synchronised in phase across the network
  • B.The capture effect removes all co-channel interference
  • C.Signals do not carry far beyond the horizon
  • D.Receivers reject co-channel signals completely

Answer: C

Because coverage is limited by line of sight, two distant transmitters do not reach one another's audiences and the frequency can be reused with adequate geographic spacing. Receivers do not reject co-channel signals; the capture effect merely favours the stronger, which is why spacing is still needed. Phase synchronisation is used in some single-frequency networks but is not the general mechanism. Frequency reuse is a planning consequence of propagation.

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