9-13B6 B
 How does a noise blanker circuit work in a HF receiver?
A. A limiter circuit clips the peaks of the noise pulses.
B. The noise pulses are used to develop a blanking pulse for the I.F. amplifier.
C. The noise pulses operate on the ratio detector to blank the audio output. 
D. A Noise blanker briefly reduces the gain of the RF amplifier when the noise pulses occur. 
