In areas of poor reception of a television signal, users have to take measures to improve the quality of sound and picture on their own. One of the possible solutions to this problem may be the use of an antenna amplifier. Under conditions of long-range reception, such a device in most cases leads to a significant improvement in image quality. When choosing an antenna amplifier, it is important to have an idea of its capabilities and principle of operation.
Instructions
Step 1
For reliable reception of a television signal, the amplifier should be installed at a distance as close as possible to the receiving antenna. In this case, power must be supplied through the coaxial cable of the feeder through the appropriate isolation.
Step 2
Make sure that the antenna amplifier has the ability to connect an adapter (power supply) with a power of up to 10 watts. This is especially important when connecting the amplifier to imported television sets.
Step 3
Pay attention to the gain of the device. With an average cable length of up to 25 m, taking into account possible losses and signal attenuation, you should choose a device with a gain of 25-35 dB. If the gain is too high, and the antenna is poorly matched to the cable, there will be solid ripples on the screen of the receiving device.
Step 4
Find out what the noise floor of the antenna amplifier is. This characteristic should be significantly lower than the TV receiver's own noise level.
Step 5
To receive broadcasting in the meter range, choose an antenna amplifier of the UTDI-1 type, designed for 12 channels. It has a built-in 220V power supply. The signal gain of the device is at least 12 dB.
Step 6
When using receivers that provide broadcasting in the decimeter range, choose a dedicated UHF amplifier. It must be installed directly on the TV antenna mast. With a gain of 14 dB, such a device can confidently amplify signals from 20 to 40 channels.
Step 7
One of the parameters that are important for signal amplification is the diameter of the cable insulation. If the length of the drop feeder is significant, use the cable with the largest insulation diameter when connecting the amplifier. The antenna amplifier allows the use of long feeders, which in the absence of an amplifier would lead to a signal attenuation to a level that does not allow receiving a high-quality signal.
