Amateur Extra: Network Impedance

Polar coordinates

The Amateur Extra class question of the week comes from sub-element 5 (electrical principles) section C (polar coordinates) [E5C06] In polar coordinates, what is the impedance of a network consisting of a 100-ohm-reactance capacitor in series with a 100-ohm resistor? A. 121 ohms at an angle of -25 degrees B. 191 ohms at an angle …

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Amateur Extra: Minimum Discernable Signal

Radio Receiver

The Amateur Extra torture question of the week is taken from sub-element 4 (amateur practices) section C (receiver performance) [E4C07] What does the MDS of a receiver represent? A. The meter display sensitivity B. The minimum discernible signal C. The multiplex distortion stability D. The maximum detectable spectrum If you stop to think about the …

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Amateur Extra: N-Type Charge Carriers

Charge Transfer

Extra question of the day is from sub-element 6 (circuit components) section A (n-type semiconductors) [E6A16] What are the majority charge carriers in N-type semiconductor material? A. Holes B. Free electrons C. Free protons D. Free neutrons First, remember what the N-type designator means.  It indicates that the device uses Negatively charged carriers.   Protons and …

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