signal generator

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Figure 5: Essential elements of (A) transmitter, and (B) receiver.

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Martin Luther King, Jr.

Why We Celebrate MLK Day

Panoramic view at sunrise of moai, Ahu Tongariki, Easter Island (Rapa Nui), Chile

6 Lost Civilizations

Dr. Martin Luther King Jr. addresses marchers during his "I Have a Dream" speech at the Lincoln Memorial in Washington. August 28th 1963

Was Martin Luther King, Jr., a Republican or a Democrat?

Adolf Hitler (Nazi, nazism, German leader).

9 Things You Might Not Know About Adolf Hitler

Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)

All 119 References in “We Didn’t Start the Fire,” Explained

Secret Service Agent Listens To Earpiece

Secret Service Code Names of 11 U.S. Presidents

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

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Photos

Figure 5: Essential elements of (A) transmitter, and (B) receiver.

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oscillator standard signal generator random-noise generator pulse generator frequency synthesizer delay line signal railroad signal distortion semaphore distress signal siren carrier wave