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X. X band alerts mean a radio wave has been detected within the 8.0-GHz to 12.0-GHz range. The X-band is the oldest radar frequency, and these days it's considered outdated if not altogether obsolete.
The SDH standard was originally defined by the European Telecommunications Standards Institute (ETSI), and is formalised as International Telecommunication Union (ITU) standards G.707, [2] G.783, [3] G.784, [4] and G.803. [5] [6] The SONET standard was defined by Telcordia [7] and American National Standards Institute (ANSI) standard T1.105.
Uniden was established on February 7, 1966, by its founder Hidero Fujimoto as "Uni Electronics Corp". Uniden became a well-known brand in the 1970s by manufacturing and marketing millions of citizens band radios (CB), under the Uniden brand as well as other companies such as Midland and Realistic, which rebranded the equipment under their own labels.
Digital Signal 1 (DS1, sometimes DS-1) is a T-carrier signaling scheme devised by Bell Labs. [1] DS1 is the primary digital telephone standard used in the United States , Canada and Japan and is able to transmit up to 24 multiplexed voice and data calls over telephone lines.
Digital Signal Designation Bandwidth/data rate Channels (DS0s) Carrier designation DS0 64 kbit/s 1 DS1: 1.544 Mbit/s 24 T1 DS1 3.152 Mbit/s 48 T1c
Intuitively, 5 out of 6 frames have 8-bit resolution equal to 64 kbit/s (8 bits × 8,000 samples per second = 64 kbit/s) and 1 out of every 6 frames has a 7-bit resolution (7 bits × 8,000 samples per second = 56 kbit/s). The distortion effect on voice and data signals is negligible when a modem is used for modulation.
The VS-316 was developed from the famous experimental VS-300 helicopter, invented by Igor Sikorsky and publicly demonstrated in 1940. The VS-316 was designated the XR-4, under the United States Army Air Forces' series for "Rotorcraft". The XR-4 first flew on 14 January 1942 [2] [3] and was accepted by the Army on 30 May 1942. [4]
The Vektor R4 is a South African 5.56×45mm assault rifle. [8] It entered service as the standard service rifle of the South African Defence Force (SADF) in 1980. [ 1 ] In South African service, the R4 replaced the R1, a variant of the 7.62×51mm FN FAL . [ 7 ]