What Is a Digital TV Amplifier?

The principle of the cable TV amplifier is that the TV signal is input from the input "IN" through the equalizer and the gain adjustment attenuation potentiometer into the amplifier module for amplification, and the output from "OUT" is sent to the next level or user branch distribution system. The equalizer has a fixed (Ranging from 6dB to 19dB) balanced inserts.

Some equalizers are manually adjusted, and the middle 5 feet of the module is a DC power supply of 24V. For the internal power supply, AC60V is transmitted with the TV signal from the coaxial cable (plug in AC60V power supply at the front end or the main line). AC60V enters the power supply via the input terminal via the inductive line

The main function of the cable TV amplifier is to compensate the attenuation of the cable TV signal during the cable transmission process, so that the signal can be transmitted stably, with high quality, and over long distances. It should also have the effect of balancing in-band curves ^[1]

a. The signal from the cable TV signal source is not good, resulting in snowflakes and unclear images.
b. The same cable line is allocated to connect multiple TVs, and the signal strength is insufficiently allocated.
c. After the multi-channel distribution of the cable TV signal in the living room or room, the signal is severely attenuated.
d. The computer graphics and stock information receiving system is used, which can reduce the error rate of information and improve the receiving speed.
e. It can be used in homes, buildings, shopping malls, hotels, guest houses and other places.
f. Professional device design, low noise, wide frequency band, suitable for cable, supplementary channel ^[1]

a. Install and connect the amplifier according to the equipment structure diagram, and connect the power. The power indicator of the amplifier should indicate normally.
b. Gain adjustment: If the input level is too low, the carrier-to-noise ratio will deteriorate, and if the output level is too high, distortion will increase. By adjusting the gain button, the output level of the amplifier is between 94-102DBv.
c. Equalization adjustment: In order to compensate for the difference in level between the high and low frequency bands caused by the transmission of cable television signals through a certain length of cable, the difference between the attenuation of the high and low frequency bands is about 4 times, that is, when the 45MHz frequency point is attenuated by 5DB, the 750MHz frequency point Attenuation 20DB), please adjust the equalization button to make the high and low sections of the amplifier output signal flat.
d. The installation position of the amplifier should be as far away from the TV as possible (the distance here refers to the length of the amplifier to the TV cable is generally more than 5M away), and install near the cable brancher to ensure that the signal source has a high signal-to-noise ratio. Install better locations with less attenuation and clearer images.
e. If the effect is not satisfactory after installation, please check whether the power is on, and whether the connector, distributor or branch is in good contact.
f. Twill interference appears in the image after the signal is amplified, because the amplifier's output level is too large, which causes signal intermodulation distortion. You can adjust the gain knob counterclockwise (for the adjustable amplifier), and reduce the amplifier output level to make the image clear. Check the signal level at the user end is too weak or the signal distortion is too large. Although the signal can be enhanced after the use of the amplifier, the image effect is not significantly improved. At this time, the front-end TV signal source should be checked. A color TV is connected to the signal branch or distribution point. The image is clear that the signal source is okay. If the image is blurred, it indicates that the quality of the signal source is poor, and the situation can be reported to the power station.
g. Pay attention to indoor-type equipment. Waterproof and moisture-proof treatment should be done when used outdoors ^[1] .