Question
What signals are used to conduct a two-tone test?
Answer Options
- A) Two audio signals of the same frequency shifted 90 degrees
- B) Two non-harmonically related audio signals
- C) Two swept frequency tones
- D) Two audio frequency range square wave signals of equal amplitude
Correct Answer: B
Explanation
The two-tone test is the standard diagnostic procedure for measuring the linearity and intermodulation distortion of a Single Sideband (SSB) transmitter. It simulates voice peaks, which are complex signals, using a simple, repeatable input.
The test requires feeding two non-harmonically related audio signals (e.g., 700 \text{Hz} and 1900 \text{Hz}) of equal amplitude into the transceiver’s microphone input. The resulting transmitted signal is then analyzed using a spectrum analyzer to observe the level of unwanted intermodulation products generated, which are direct indicators of non-linearity (distortion).
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