Question
What effect can strong signals from nearby transmitters have on an antenna analyzer?
Answer Options
- A) Desensitization which can cause intermodulation products which interfere with impedance readings
- B) Received power that interferes with SWR readings
- C) Generation of harmonics which interfere with frequency readings
- D) All these choices are correct
Correct Answer: B
Explanation
An antenna analyzer uses a sensitive internal receiver to measure the forward and reflected signals it generates. If there are strong external radio frequency (RF) signals present, they can enter the analyzer through the antenna port.
This strong external energy acts as received power that interferes with SWR readings. The analyzer’s internal circuitry, which is measuring a very weak test signal, can be overwhelmed by the external signal, leading to inaccurate or unstable SWR and impedance measurements. For this reason, it is best to turn off all transmitting devices when using an antenna analyzer.
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