Question
How can fundamental overload of a non-amateur radio or TV receiver by an amateur signal be reduced or eliminated?
Answer Options
- A) Block the amateur signal with a filter at the antenna input of the affected receiver
- B) Block the interfering signal with a filter on the amateur transmitter
- C) Switch the transmitter from FM to SSB
- D) Switch the transmitter to a narrow-band mode
Correct Answer: A
Explanation
Fundamental overload (T7B03) occurs when a non-amateur device is overwhelmed by the sheer power of the amateur signal, regardless of the amateur radio’s frequency. Since the amateur signal itself is clean and legal, the solution usually lies with the affected device.
The best way to prevent the strong amateur signal from reaching the sensitive internal circuits of the TV or radio is to block the amateur signal with a filter at the antenna input of the affected receiver. This filter, usually a high-pass filter, allows the high-frequency TV/FM signals to pass while strongly blocking the lower amateur radio frequencies.
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