Question
What control is typically adjusted for proper ALC setting on a single sideband transceiver?
Answer Options
- A) RF clipping level
- B) Transmit audio or microphone gain
- C) Antenna inductance or capacitance
- D) Attenuator level
Correct Answer: B
Explanation
Automatic Level Control (ALC) is a crucial circuit in a single sideband (SSB) transceiver that automatically reduces the gain in the transmitter’s audio or intermediate frequency (IF) stages to prevent the final amplifier from being overdriven. An overdriven amplifier causes ‘flat-topping’ and generates excessive distortion and spurious emissions (splatter) outside the intended bandwidth.
The proper way to set the ALC is by adjusting the Transmit audio or microphone gain control. The goal is to set the microphone gain high enough for a strong signal, but low enough so that the ALC meter on the transceiver only deflects slightly or not at all on voice peaks. If the ALC is constantly heavily deflecting, the transmit audio is too high, leading to distortion.
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