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Question 277

Which of the following can reduce interference to a 2-meter band transceiver from a nearby commercial FM station?

  1. Installing an RF preamplifier
  2. Using double-shielded coaxial cable
  3. Installing bypass capacitors on the microphone cable
  4. Installing a band-reject filterCorrect answer

Explanation

A commercial FM broadcast station transmits in 88 to 108 MHz, close enough to the 2 meter band that a strong local signal can overload the receiver front end. A band-reject (notch) filter tuned to the broadcast band attenuates that signal while passing 144 to 148 MHz; a preamplifier would raise the interfering signal along with the wanted one and make matters worse.

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Question 277: Which of the following can reduce interference to a 2-meter… · FCC Technician Class (Element 2) · Questena