Question

The modem must control ____ to produce the desired carrier frequency.

a.

filter

b.

low noise amplifier

c.

power amplifier

d.

antenna-matching unit

Posted under Cognitive Radio

Answer: (c).power amplifier Explanation:The modem controls external RF elements, including transmit and receive mode, carrier frequency and smart antenna. The modem controls power amplifier and local oscillators to produce the desire carrier frequency.

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Q. The modem must control ____ to produce the desired carrier frequency.

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