Question
Which of the following could you use to cure distorted audio caused by RF current on the shield of a microphone cable?
Answer Options
- A) Band-pass filter
- B) Low-pass filter
- C) Preamplifier
- D) Ferrite choke
Correct Answer: D
Explanation
When transmitting, radio frequency (RF) energy can sometimes travel from the antenna system back into the station and couple onto accessory cables, such as microphone or computer cables. This unwanted RF flowing on the cable shield is called RF feedback (T7B11) and often causes distorted or garbled audio.
The best and most common solution is to install a Ferrite choke. This device snaps around the cable and creates an inductive resistance (impedance) specifically at radio frequencies, blocking the unwanted RF current from flowing on the cable while allowing the desired audio signal (which is very low frequency) to pass through unaffected.
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