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Field strength detectors. Schemes, articles, descriptions

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Field strength detectors

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Power amplifier KB transceiver

Section RF power amplifiers. The described device allows linear amplification of power in the frequency range from 1,83 to 29,7 MHz. Its input and output impedance is about 50 ohms. The maximum input signal level is 150 mV (effective value). When it was tested by the two-frequency method, the power at a frequency of 14,1 MHz in the peak of the envelope on a load with a resistance of 50 Ohms reached 75 W, and the level of mutual modulation did not exceed 30 dB. In this case, the terminal stage consumed a current of 27 A from a voltage source of 5 V. The efficiency of the terminal stage when operating with a telegraph and power in a load of 40 W is 40%. The circuit diagram of the amplifier is shown in fig. 1 ... >>

Simple radio warning system

Section Security devices and signaling of objects. Sometimes a simple system is enough for remote notification when guarding a garage or car. In this case, the proposed device may be useful, consisting of a radio transmitter operating at a fixed frequency of 26945 kHz and a narrow-band receiver. The electrical circuit of the transmitter is shown in fig. 2.73. The high-frequency part consists of two stages on transistors VT1, VT2 and has a minimum number of tuning elements ... >>

Alto Simulator

Section Electronics - musician. This module contains two jammed oscillators, the quasi-resonance frequencies of which differ by an octave. The level of the generator with the upper frequency is set higher, and its after-sound is short. It simulates the sound of hitting plastic. The low-frequency generator, lower in level but with a larger aftersound, determines the tone of the drum sound. The cut-off trimmer removes vibrations transmitted through the common mounting post, and the sensitivity trimmer sets the maximum amplitude of the trigger pulse, with the strongest impact on the sensor. Launch conclusions - for other simulator modules ... >>

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Articles on field strength detectors

Articles on field strength detectors; circuits of field strength detectors; descriptions of field strength detectors: 22 articles



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Sound-absorbing silk 17.05.2024

In a world where noise is becoming increasingly intrusive, the emergence of innovative materials that can reduce its impact is of great interest. MIT researchers have unveiled a new sound-absorbing silk fabric that promises to revolutionize quiet spaces. The Massachusetts Institute of Technology (MIT) has made significant breakthroughs in the field of sound absorption. Researchers have developed a special silk fabric that can effectively absorb sound and create cozy, quiet environments. The fabric, thinner than a human hair, contains a unique vibrating fiber that is activated when voltage is applied to it. This feature allows the fabric to be used to suppress sound waves in two different ways. The first method uses fabric vibrations to generate sound waves that cover and cancel out unwanted noise, similar to noise-canceling headphones. This p ... >>

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Family relationships are often complex and multi-layered, and conflicts between siblings are no exception. Research in this area can help us understand what factors underlie these conflicts and why they occur so frequently. Let's look at some of the findings from psychologists at Arizona State University. American psychologists from Arizona State University conducted a study aimed at identifying the causes of conflicts between brothers and sisters. They found that different forms of violence, whether physical or verbal, did not depend on the gender of the siblings. This means that both girls and boys can exhibit aggressive behavior towards their loved ones. Other studies have shown that conflict between siblings often persists into adulthood, even as contact decreases. This indicates that people often follow established patterns of behavior formed in childhood. It was also found that, despite ... >>

Random news from the Archive

Beware of moonlight 12.09.2010

Landing in the subpolar regions of the moon can be life-threatening for astronauts, according to American physicist William Farrell.

Lunar craters in these areas may have a large electrical charge. Solar wind - a stream of charged particles from the Sun, sliding tangentially over the surface of the satellite, is able to charge the protruding edges of craters with electricity. At best, this effect will cause particles of lunar dust to stick to spacesuits and rovers, at worst, a lightning-like discharge.

If lunar lightning fails to pierce the spacesuit or the skin of the descent module, then damage to sensitive electronics is guaranteed.

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