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An Army Jump Master giving the hand signal for "30 seconds" over a drop zone. Hand and arm signals for United States Army use were first established in Field Manual 21-60. They were amended in Training Circular 3-21.60. [1] Hand and Arm signals are one of the most common forms of communication used by United States Army soldiers or group of ...
Hand signals were an important part of the traditions of the schools in the Southwest Conference. Invention of "Guns Up" is attributed to 1961 Texas Tech alumnus, L. Glenn Dippel. Living in Austin with his wife Roxie, Dippel created "Guns Up" as a way to counter the "Hook 'em Horns" handsign he saw each day from fans of the Texas Longhorns. [3]
The first basic military map symbols began to be used by western armies in the decades following the end of the Napoleonic Wars.During World War I, there was a degree of harmonisation between the British and French systems, including the adoption of the colour red for enemy forces and blue for allies; the British had previously used red for friendly troops because of the traditional red coats ...
The (American version) radio's main receiver covers 30 kHz through 60 MHz, 142 MHz through 152 MHz, and 420 through 450 MHz (plus 1240 through 1300 MHz with the "X" model). The sub-receiver tunes between 118 and 174 MHz, and from 220 to 512 MHz (VFO ranges).
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Date/Time Thumbnail Dimensions User Comment; current: 12:53, 16 February 2008: 600 × 260 (50 KB): Inductiveload {{Information |Description=A graph showing an FM modulated signal with the original message signal.
Enjoy a classic game of Hearts and watch out for the Queen of Spades!
FM is not entirely free of noise. While AM has a rectangular noise spectrum, with the amplitude of random noise in the demodulated signal constant across the audio spectrum, FM has a triangular noise spectrum, with the amplitude of noise increasing with frequency, i.e., it rises at a rate of 6 dB per octave, or 20 dB per decade.