REMO antennas of the Saratov Electromechanical Plant are in demand among buyers interested in watching digital terrestrial television programs in high quality. The model range includes products designed for use both in residential premises and for placement outside buildings. Antennas produced by the enterprise can be passive and active. The first of them use the directional and selective properties of the design without the use of signal amplifiers. REMO active TV antennas involve the use of additional amplifiers in their composition. The article will help potential buyers make the right choice, taking into account individual requirements for the location of the antenna and its distance from the digital television signal transmitter.
A bit of theory
Television broadcasting is carried out in the ranges of meter (MV) and decimeter (UHF) waves. The last of them are used for broadcasting by television centers of digital program packages. TV standard DVB T2. To ensure the best conditions for receiving a television signal by an antenna, the geometric dimensions of its elements must be commensurate with the wavelengths of those ranges for which it is intended. The MW range corresponds to wavelengths from six to one meter. Programs are broadcast on 1-12 television channels, which corresponds to the frequency range (48-230) MHz. In the UHF range, the wavelength is from one meter to ten centimeters. Telecenter programs are broadcast on 21-69 television channels in the frequency range (310-860) MHz.
The most efficient antennas are those whose linear dimensions meet the requirement of ½ or ¼ of the received wavelength. The main vibrators can be in the form of "whiskers", with the possibility of changing their length and opening angle, open frames, rings, ellipses. Additional elements used to improve the directional properties of the antenna are transverse plates or metal rods. They are located on a common horizontal traverse, the longitudinal axis of which is directed to the TV signal translator.
Types of products produced by the factory
Antennas manufactured by the REMO manufacturer differ in the range of received waves. Most often, the catalogs contain samples that receive only in the UHF range, and all-wave antennas. Products designed to operate in the decimeter range are made according to the "wave channel" type.
Their narrow radiation pattern is provided by numerous directors located one behind the other in a horizontal plane. The angle of the main lobe of the diagram is directly related to the directivity and gain of the band antenna.
The design can be made according to the type of "logo-periodic antenna" or "Z-antenna" (zigzag antenna). To increase the efficiency, reflectors are used in the structures. They are made in the form of a frequent lattice located behind the main active vibrator. Reflectors are used to reflect waves received from the direction to the TV center towards the main vibrator.
All-wave antennas for receiving MW programs are supplemented with a half-wave dipole. The length of its shoulders ("whiskers") corresponds to half the wavelength of the middle of the MW range. The length of the vibrators can be changed manually.
Indoor devices
Indoor television antennas can be successfully used in large settlements near television transmitting centers. Their use at a distance from the broadcasters at a distance of more than 10 km does not allow to achieve high quality viewing and sound of the TV show. A digital television picture may break into separate fragments or not appear at all.
Indoor antennas often have an original design that fits into the overall interior of the apartment. They can be all-wave and range. ForTo obtain high-quality reception of MV band programs, telescopic antennas are used. Adjustment consists in changing their length and the angle between them. Indoor antennas are available in active and passive versions. Passive antennas achieve acceptable reception quality through competent design solutions. Active antennas use electronic amplifiers for the total signal received by the passive antenna. They require DC power to operate.
When choosing an indoor antenna, you should be guided by its technical characteristics indicated in the accompanying documentation. The main one is the value of the gain, expressed in units of decibels (dB). For a passive antenna, a value of 12-14 dB can be considered acceptable. In the case of using a built-in amplifier, the total factor, which is usually indicated in the manual, can be up to 40 dB. But this value does not reflect the directional properties of an indoor antenna. It is advisable to choose a device that has adjustment elements for this indicator. By changing its value (often downwards), you can achieve a high-quality and stable image.
It is worth paying attention to the length of the coaxial TV cable. Having enough headroom will allow you to choose the optimal location of the antenna in the room to ensure stable reception.
Mini Digital Review
Mini Digital is the English definition of a digital miniature device. The antenna vibrator is made in the form of a frame,the ends of which are connected inside the white plastic case to the input of the built-in antenna amplifier. The amplifier can be powered via an additional external 12 V DC power adapter or via a TV cable using a separator from the USB connector of a set-top box or TV with Smart TV support. The REMO Mini Digital antenna can be fixed on the window glass using suction cups located on the lower surface of its body. At the same time, direct visibility in the direction of the television center should be provided.
The UHF/UHF gain of the active antenna is 33 dB, which corresponds to a signal amplification of 45 times compared to an isotropic radiator (vertical pin with a spherical radiation pattern). Its operating range is 470-862 MHz.
Outdoor TV antennas
Antennas for outdoor use allow, with their correct location, to provide viewing of television programs in high quality at a significant distance from the transmitting centers from the place of reception. The greatest effect can be achieved by narrowly directed antennas with a large intrinsic gain. Multi-element antennas of the "wave channel" type or log-periodic designs are capable of achieving an intrinsic gain of 25-26 dB using effective reflectors.
Outdoor REMO antennas have to be raised to a considerable height above the earth's surface to get high quality "pictures" on the TV screen. In this case, most of the received signal poweris lost in the coaxial connecting cable, which has a characteristic impedance. Losses depend on the type of cable used and the distance from the receiving antenna to the installation site of the television receiver. A television cable with a standard impedance of 75 ohms has a signal attenuation per unit length of about 0.15-0.7 dB/m.
Hence the need to use active antennas with a built-in amplifier. Antenna for TV REMO, when using an additional stand-alone amplifier and splitter, can ensure the operation of several television receivers.
Their gain should provide compensation for losses in the cable, taking into account its length. In addition to the gain, the amplifier must have a low level of self-noise. The acceptable noise figure is 1.7-3.0 dB.
Introducing REMO Triton
There are models for different purposes in the Triton line from REMO.
Among them are all-wave antennas and antennas designed to receive only DVB T2 digital television in the UHF range. All-wave models can be distinguished by the presence in their design of the "whiskers" of a half-wave vibrator. Antennas of both classes are active. Their impressive dimensions - the length of the traverse is 1.3 meters - testify to the high value of the gain. Its value is 40 dB. The amplifier maintains this value in the frequency range of broadcasting 1-69 TV channels.
The REMO Triton antenna is equipped with special filters to suppress the signals of GSM operators of cellular communications of the second generation.
Factors affecting TV signal quality
The remoteness of the transmitting center from the reception point is the main, but not the determining factor for stable reception and high-quality images on the TV screen. The terrain, the presence of obstacles in the form of massive reinforced concrete buildings on the path of the rectilinear propagation of radio waves of the meter and decimeter ranges, has a great influence. For indoor antennas, even furniture and window bars can be an obstacle. An undesirable factor is the presence of sources of electromagnetic interference.
Reviews
Reviews about REMO antennas by buyers who have been using these products for a long time have a great influence on the decision on a profitable purchase. The positive nature of the opinions of the vast majority of users indicates the high quality and reliability of the manufacturer's products. This applies to both indoor and outdoor antennas.
Conclusion
After reading the material presented in the article, the reader who is going to choose an antenna for watching television programs in high quality will be able to competently evaluate the characteristics of the proposed product and determine the qualifications of the seller. REMO antennas, given the ratio between price and quality, as well as numerous positive reviews, can be his choice.
