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Spektrum DX6i six-channel spread spectrum computerized aircraft radio which may be used for both helicopters and fixed-wing models. Spektrum is a brand of radio control systems designed for use with hobby radio-controlled cars and aircraft. Spektrum is a division of Horizon Hobby.
(4 independent RX chains and 4 independent TX chains, each capable of up to 322 MHz of RF bandwidth) 16 16 Yes Four dual channel, 16 bit, 370 MSPS ADCs; Two quad channel, 16 bit, 2500 MSPS DACs; 4/4 2x 10Gbit/s SFP+, Ethernet Yes Yes Yes Cross Country Wireless SDR receiver v. 3 [34] Pre-built 472 – 479 kHz, 7.0–7.3 MHz/10.10–10.15 MHz,
The receiver correlates the received signals to retrieve the original information signal. Originally there were two motivations: either to resist enemy efforts to jam the communications (anti-jam, or AJ), or to hide the fact that communication was even taking place, sometimes called low probability of intercept (LPI).
A four channel quadraphonic diagram showing the usual placement of speakers around the listener. Quadraphonic (or quadrophonic, also called quadrasonic or by the neologism quadio [1] [formed by analogy with "stereo"]) sound – equivalent to what is now called 4.0 surround sound – uses four audio channels in which speakers are positioned at the four corners of a listening space.
51J-4 Professional 1955 .54-30.5 30 bands CW AM 12 Collins R-390 Government Collins R-390A Government 1955-1970 .5-32 double conversion 32 band valve AM CW FSK 0.1 1 2 4 6 16 16 0 1 Cubic: R-2411V Professional dual receivers AM CW FSK LSB USB 0.5 1 3 8 100 per side 4 44 2 Cubic R 3050 Professional 5 21 2 Cubic R-3500-20 Government LF MF HF rack ...
The transmitter and receiver can use fixed tables of frequency-hopping patterns, so that once synchronized they can maintain communication by following the table. In the US, FCC part 15 on unlicensed spread spectrum systems in the 902–928 MHz and 2.4 GHz bands permits more power than is allowed for non-spread-spectrum systems.