Special Sub-Topic: Modern Televison Technology
|In the United States the television broadcast standard is:|
NTSC. PAL and SECAM are standards used in other countries. RGB stands for red, green, and blue - the colors of light used to create an image in a color tv set and is often used as a format name for computer monitors.
|The NTSC (National Television Standards Committee) is also used in the country of:|
|In a color television set using a picture tube a high voltage is used to accelerate electron beams to light the screen. That voltage is about:|
25 thousand volts. This voltage often remains in storage even if the set is unplugged. Although the voltage is very high it has very low power but it can be dangerous because your body jumps if brought in contact.
|Most modern TVs draw power even if "turned off" to standby mode. The circuit the power is used in does what function?|
remote control. Some authorities are recommending TVs, VCRs and Stereos be connected to power strips with switches and turned off when not in use to save energy. Your remote will not work until power is switched back on.
|The input used by an antenna or cable to a TV set uses frequencies called:|
RF. RF is radio frequency. IF is intermediate frequency used inside the TV for processing. AF is audio frequency. SAP is second audio program which may have another language or other soundtrack as an option to the main soundtrack.
|The electromagnetic coils on the neck of the picture tube or tubes which pull the electron beam from side to side and up and down are called a:|
yoke. Twisting the yoke will tilt the picture. A projection color television uses three picture tubes and yokes for red, green and blue light.
|If the picture is stretched or distorted up and down like a fun house mirror the circuit to adjust or repair is:|
vertical. Improper vertical linearity would describe this symptom.
|The transformer that develops the high voltage in a home television is commonly called a:|
flyback. The flyback is usually connected to the system that pulls the electron beam across the screen in one direction to 'paint' a line of the image and then returns in the other direction much faster.
|The most common format for a home video recorder is VHS. VHS stands for:|
Video Home System. JVC (Japan Victor Corporation) and Matsushita (Panasonic) developed the VHS format to compete with Sony which developed the Beta format as the first home video cassette recorder. VHS originally stood for Vertical Helical Scan, but now means Video Home System.
|The average power (in watts) used by a 20 to 25 inch home color television is:|
70-100. About the same as as the most popular light bulb size.
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