1.

What is added to SPN-42 to eliminate wandering of the echo skin?(a) AESA(b) Aircraft beacon(c) PESA(d) Helical antenna

Answer» Correct choice is (b) Aircraft beacon

The best explanation: The SPN-42 was retrofitted with a small X-band parabola when aircraft beacons were added to eliminate errors caused by wandering of the echo skin.


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