2024 Author: Howard Calhoun | [email protected]. Last modified: 2023-12-17 10:16
The main purpose of the high-frequency generator is that it creates oscillations of the electric field. The range of these fluctuations has rather wide limits: from several tens of kilohertz to hundreds of megahertz.
General description of the RF device
Most ordinary people use this device to stop the counter. A high-frequency generator is really capable of stopping the operation of such equipment, creating oscillations. In addition, this appliance can also be used as a power supply for common household appliances. If we talk about power, then the output voltage reaches 220 A, and the power is 1 kW. It is also possible to replace some elements with more powerful ones. If this is done, then the output characteristics of the high-frequency generator will increase, and with its help it will be possible to power a larger number of units or several, but more powerful ones. The connection of the HF itself is carried out to a regular household network. It is important to note here that the wiring diagram is quite simple, and there is no point in changing it in any way. In addition, there is no need to use a grounding system for this.device. When such oscillatory units are connected to the network, they do not completely stop the operation of the meter. The unit continues to operate, but only 25% of the actual electricity consumption is recorded.
Instrument action
If you look in more detail at the operation of a high-frequency generator, then the equipment stops due to the fact that a capacitor is used in the device circuit. The connection is made precisely to this part, which has a charge that completely coincides with the sinusoid of the voltage flowing in the network. The implementation of the charge occurs by means of pulses with a high frequency. Thus, it turns out that the current that the consumer consumes from his home network becomes a high-frequency pulse. Ordinary electronic meters installed in homes are characterized by a lack of sensitivity to such fluctuations. This means that the unit will take into account the current consumption of the pulsed form with a negative error.
Scheme description
The high-frequency generator circuit is characterized by the presence of certain key elements. These include: rectifier, capacitance, transistor. Further, if we talk about connecting a capacitor, then it is connected in series to the circuit with a rectifier. This is necessary so that while the rectifier is working on the transistor, the capacitor can be charged up to the voltage that is available in the network.
Most often the limit of charging a capacitor inhigh-frequency generator becomes 2 kHz. If we talk about the voltage that is currently present on the load and capacitance of the device, then it approaches a sine of 220 V. In order to limit the current flowing through the transistor while the capacitance is charging, the circuit has a resistor that is connected to key cascade using a serial connection.
Features of HF performance
The generator is executed entirely on logical elements. It produces oscillations or pulses with a frequency of 2 kHz, as well as with an amplitude of 5 volts. There is also such a characteristic as the signal frequency. The value of this parameter is determined by the elements C2 and R7. In standard notation schemes, this signature format is used. The properties that these elements give can be used to adjust the maximum error in accounting for energy consumption. Elements such as T2 and T3 - transistors are responsible for creating pulses. Together they are called the impulse maker. This part is also responsible for the correct operation of the transistor T1.
Devices such as a rectifier, transformer and others are used as a small power supply. The main task is to supply energy for the operation of the microcircuit with other elements. These small power supplies are usually rated at 36V.
High frequency signal generator G4-151
The main purpose of such a generator is to set up, check, adjust andtesting of radio engineering devices. Using this device, you can measure the amplitude-frequency characteristic, sensitivity, selectivity, etc. In addition, this equipment can also be used as a signal source that works with different methods of oscillation modulation. It can be amplitude, frequency or pulse modulation. It is also possible to create unmodulated oscillations. Most often, such equipment is used in calibration bodies, in equipment repair shops, in workshops or laboratories.
The output of information from this high-frequency signal generator is an ordinary digital code. In addition, for ease of control, there are analog inputs that allow you to remotely control all the parameters of the device.
Handmade assembly
Since it can be difficult to assemble a real high-frequency generator circuit with your own hands, there is a somewhat simplified assembly option. In this case, instead of a transistor, an element with negative resistance will be used in the circuit. Still such elements are quite often called amplifying. In very simple terms, the current at the output of such devices is always greater than the current at their input.
An oscillatory circuit is connected to the input of such a device. Further, it is very important from the output of the same amplifier through feedback it is necessary to connect it to the same oscillatory circuit. By connecting the circuit in this way, you will get the following result. The input receives a current of a certain value,passing through the amplifying element, it increases, which feeds the loop capacitor. With the help of feedback, the already amplified current returns again to the input to the circuit, where it is again amplified. This circular process goes on all the time. It is he who causes undamped oscillations inside the generator.
Tube tweeter
One of the varieties of high-frequency signal generators is tube devices. Such devices are used in order to obtain plasma with the desired parameters. To do this, you need to bring a certain discharge to the power of the device. For such devices, the key elements are emitters, the operation of which is based on the principle of power supply.
Another important element for tube HF operation is power amplifiers. These parts, mounted on lamps, are used to convert direct current to alternating current. Naturally, the operation of a lamp generator is impossible without the lamp itself. Various elements can be used. The GU-92A tetrode has become quite common. This part is a vacuum tube that uses four elements: anode, cathode, shielding and control grids.
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