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A modern LF radio-controlled clock. A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [1]) referred to as an "atomic clock", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.
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The new EF50 valve from Philips enabled Pye to build this high-gain receiver, which was a tuned radio frequency (TRF) type and not a superhet type. With the outbreak of World War II , the Pye receiver using EF50 valves became a key component of many radar receivers, forming the 45 MHz Intermediate Amplifier (IF) section of the equipment.
The older Philips system [ edit ] Prior to 1934, Phillips numbers were based on a sequence of one letter to indicate filament current range, followed by one or two digits for the filament voltage, then two digits that gave either the amplification factor (for triodes) or a code beginning with 41 to indicate tetrodes, pentodes and so on. [ 11 ]
Since 2005, the software has been released as open source software under the GNU General Public License. This licensing change required substantial rewrites and took several months to complete. Although Joe Taylor was the original developer (and still acts as maintainer), several programmers are currently involved in writing the software.
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Other, rarer Philips models included stereo sound and editing capabilities. Circuitry and internal layout was much more modular than the first generation Philips VCRs. Used quiet DC motors (First generation VCR's used hefty synchronous AC mains motors). Basically this model was the same as the Philips N1502 with an extra board for video in / out.