Logoperiodic antennas belong to the classdirected devices. Models, as a rule, work on short waves. Most devices are equipped with a high-conductivity reflector. Some modifications are made with a panel vibrator. They have one or more amplifiers. Also it should be noted that there are devices with channel transmitters.
What are the main parameters of antennaslogoperiodic type? First of all, it is important to consider the frequency of devices. The specialists also consider the directivity and amplification factor. The input resistance also affects the antenna parameters.
Calculation of the antenna is based on the length of the rack.If we consider models with a single vibrator, then the reflector is of the dipole type. At a length of 20 cm, the width of the panel should be 30 cm. With the increase in the size of the rack, the panel is selected the appropriate size.
Logoperiodic antenna with own handsfolds with a simple reflector, and the vibrator is more appropriate to use with an extension. First of all, the mast is put directly. The posts are fixed using a welding machine. Experts advise to install the amplifier immediately.
Wiring must only be used with grounding.To reduce the frequency, different types of expanders are used. Most models work from contact adapters. The upper posts should be of small diameter. Also it is necessary to pay attention to the lower adapter, from which the wire leaves. Depending on the calculation of the model, the dimensions of the log-periodic antennas depend.
Logoperiodic antennas for simple receiversThey are produced with masts of low height. The most common are the modifications to three racks. If we consider an antenna with a single adapter, then the reflector is applied with a capacitor. Also it should be noted that the mast is fixed on the rack. The shout in this case is very rare. The adapters at the antenna are fixed through the holders. Experts say that the most popular models are those with dipole adapters. They can work on a short wave.
An antenna with one rack is not allocated highconductivity. On the market there are devices with back vibrators. They use a fairly wide support. In this case, the holders are set to a small width. If we consider a standard antenna of the log-periodic type, it has one reflector. Racks are installed on the mounting stand. Often antennas are sold without holders. They stand with a wide base. The most high-quality devices are considered to be with enhanced adapters. Vibrators can also be installed without an adapter. Racks in this case are of small length.
Logoperiodic DMB antenna with two racksis made with a reflector for three channels. Experts say that the models have different conductivities. When choosing a modification, it is necessary to pay attention to the modification support. The holders can be L-shaped. Quite often antennas of this type are installed on the roof.
Devices are well suited for adoptiontelevision channel. However, they are not able to work at all frequencies. In this case, much depends on the shape of the reflector. Modern modifications of the log-periodic type antennas are used with output amplifiers. Only open adapters are installed under them. In this case, the vibrators are mounted in the central part of the rack. Masts differ in length. Much depends on the width of the racks. The conductivity of the modification depends on the reflector. The wire from the antenna must move away from the expander.
Horizontal antenna for TV log-periodictype stands out by a wide rack. Many models use a long mast, and the supports are made only of an aluminum alloy. If desired, such an antenna log-periodic type can be done independently. It is good for a receiver of low power. Specialists say that in the first place put the holder. Only after this you can install the mast. The next step is to put a reflector. If we consider shop modifications, they have two vibrators.
Most models are made without stops.Their posts are in a horizontal position. To install a log-periodic type antenna, wide metal fasteners are used. Also it should be noted that there are modifications of high frequency, in which the amplifier is installed. Expanders for devices are selected only for high conductivity. Quite often in the market there are devices with negative polarity. First of all, experts note that they have no problems with short waves, and very high gain. The dimensions of the log-periodic antennas directly depend on the calculations of the model.
Often in shops there is a verticallogoperiodic antenna. The model is calculated based on the dimensions of the rack. Vertical log-periodic type antennas are manufactured with reflectors of different conductivity. Most models are made on contact adapters.
Also in the shops you can find devices withoutamplifiers. As a rule, they use short reflectors, and the vibrators are set short-wave type. The minimum permissible frequency of an antenna depends on many factors. In this case, the user must take into account the resistance of the reflector. In addition, you need to know the type of expander. Most models are sold with conventional controllers.
Logoperiodic antennas of this type are made withlong posts, and vibrators are used with supports. The standard model includes one connector. Amplifiers for these log-periodic antennas are installed with different power. Additionally, it is important to remember that modifications differ in conductivity. Some devices are made with one rack. They have a small input resistance. As a rule, they are produced with an output vibrator. The holders are set to a small height. If desired, such an antenna log-periodic type can do any person. In this case, it is important to calculate the height of the rack.
An antenna for TV of this type is onlydipole reflector. In this case, the vibrators are used with medium conductivity. Experts say that on the market quite often there are modifications with wire adapters. Reflectors they are installed on the racks. The side supports can be very large. Also, the high level of resistance of these log-periodic antennas deserves attention.
If desired, the model can be assembled at homeconditions. Specialists for this purpose use metal racks, which are connected together by a welding inverter. The vibrator is used with one output. The wire from the antenna is fixed on the expander. As a rule, it is mounted at the bottom of the mast.
Logoperiodic antenna for T2 with copper mastworks great on different frequencies. The standard model includes a contact adapter, which is fixed at the bottom of the rack. Vibrators for models are only used with the expander. Also it should be noted that the stores have antennas with wide reflectors. Most of them can work at low frequencies. Experts say that there are devices of reverse polarization. For them, expanders are used with contact reflectors. Some models are equipped with amplifiers that connect to the sub.
Logoperiodic antennas with a steel mastcan do by yourself. Specialists recommend to harvest wide supports for this. Most models have high conductivity, and they are well suited for signal reception. The vibrators of the models are of different sensitivity. In this case, amplifiers, as a rule, are installed in the lower part of the masts. Experts say that the adapter should be fixed only through a transistor and a power supply.
Additionally, it is important to note that when assemblingmodels can have problems with the racks. If we consider the store antennas, then they have a wide holder. In this case, the front supports are securely fixed directly to the mast of the device.
