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Little mountain station lightning protection measures


(Continued on page 74) TV Technology 1997 3 71 crisp length ratio: u ... =, such as .... A £ JLr ... / eleven us_vm a 4.83_1.77 a 77 one hundred and eleven '(times) Lu one thousand one hundred and eleven z. 75310BuII / / ‰ B. (Fold) calculated result, U-maticVTR record wavelength S-VHSVTR record 1.77 times the wavelength, is Hi8VTR record 2.75 times the wavelength. Caused by the record loss of u-maticVTR minimum frequency, brightness, chroma signal to noise ratio is better than S-VHSVTR and Hi8VTR. Performance in image quality, S-VHsVTR, Hi8vTR editing prone to tail brightness, color clarity decline. Here, according to the color subcarrier frequency analysis of the VT. R, color reproduction performance. Previous section provides a frequency bandwidth graph, we can see, Hi8 color subcarrier frequency is 743kHz; U-maticSP color subcarrier frequency 924Id-Iz} S-VHS to 627kHz ~ U-matic to 685kHz. As the magnetic recording playback voltage 6dB / octave rising characteristic can be obtained on the S-VHSVTR the vTR color subcarrier playback voltage increment △ G. AG (U-maticSP) of S. VHS one (924-627) / 627 × 6-2.8 (dB) AG (U-raatic) on S-VHS = (685 - 627) / 627 × 6 = 0.56 (dB) △ G (Hi8 ) of S-VHS a (743-627) / 627 × 6 a 1.11 (dB) U-maticSP color subcarrier voltage higher than the S-VHS playback color subcarrier playback voltage 2.8dB, Hi8 higher than the S -VHS1.11dB, U-matic than S · vHSO. 56dB. Color subcarrier frequency offset U-maticSP to 1.7MHz, Hi8 and U-matic at 1.5MHz, are greater than s-Ⅷ s chrominance subcarrier frequency offset Therefore, S-VHS VCR's color reproduction characteristics than other machines kinds of difference (low color resolution). Tape wrapping angle. U-maticVTR based on the use of Lu with the way, S-VHS using M-band on the way, showing that u-machine tape wrap angle is greater than the s-Ⅷ s-type machine heads in close contact with the tape, go with the smooth. Jitter due to the tape, magnetic tape caused by factors such as loss of signal loss is less than S-VHS machine. Actual use, is also a 2 head VCR, playback, static images and fast forward, when you put down u-like image quality superior to S-VHS machine machine. By this analysis,abercrombie paris ouverture, we have to understand the performance of several VTR. Poor equipment performance, due to an increase in the number of editors, image quality deterioration serious. Such as images produced mixed color, noise increases, resulting in high-frequency loss - black,ed hardy paris, white point trailing. Therefore, to maintain good image quality, editing system, or use 3/4U-maticSP as well so the price and s-VHs editors rather, copy the image quality comprehensive index is much higher. Pre-press can be used JVC1/2SP shooting format, such as KY27 + BR: $ 420CE, KY17 + BR a $ 420CE and so on. Post-production editing to 3 / 4 high with such configuration, the early use of light shooting, and high reliability, low investment, the system will not drop indexes,abercrombie paris, configuration shown in Figure 3. Figure 3 Edit the System Configuration (final date 19,961,204) (on page 71) resets the time base circuit rG, @ Tuen foot of a low sugar level, power relay J Ai together, JI contacts closed, the loss of air pressure switch on the coil c power closure, automatic air circuit breakers normal power supply. Meanwhile, the LED light indicates power LEn} when the normal power supply has a three-phase ABC rises to 450V phase when Ic: output high, the supply voltage down to 310V at Ic. Output high. As long as Ic. Or Ic: a high output, or the gate open, BG conduction, a storage charge by BG Tuen rapid release, Ic | ② feet into the low, Ic. Is set, @ pin output high, the release of the relay J, J disconnect contacts, loss of pressure off the coil C Tuen, automatic air circuit breakers A jump off, the total power supply is cut off, to supply over-voltage protection purposes. Meanwhile, the light-emitting diode LED = off, LED light. Auxiliary contacts K, K is disconnected, the overvoltage protection device itself has protective effects against head and burn overvoltage overvoltage protection device (final date 19,961,206) TV access surgery (3) 1997
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