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Magazine HF and VHF

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Alphabetical list articles with annotations, from journals published in 2000 in the journal KV and VHF:

50 ohm feeder for W8JK directional antenna

J antenna for 70cm

Vertical antenna for 6 and 10 m bands

Output beam tetrode 6P45S

Generator tetrode GU-84B

hybrid mixer

Long-wave converter for KATRAN receiver

HF transceiver ICOM IC-718

Collection of Ham Radio Soundblaster Software

Computer simulation of Yagi antennas

50 MHz Band Converter

Linear HF amplifier ACOM 2000A

Multiband vertical antenna

Multiband vertical antenna

Modem

Modem for HF and VHF packet

Modernization of KATRAN radio receiver units

Directional antenna for 40 m range

Adjusting the quartz filters

On the excitation of linear tube power amplifiers in a grounded grid circuit

About using macros in WF1B

Parameters of the GU-50 electron tube in triode connection with combined grids

Switchable Antenna Box at 80m

Antenna switching via cable

Increasing the transmitter power of the PALMA radio station

Portable HF transceiver

Portable HF transceiver

R-399A - HF transmitter exciter

Antenna Direction LED

Synthesizer FM radio two-meter range

Frequency synthesizer

Frequency synthesizer for VHF receiver or transceiver

Sweet poison of simple solutions

Silent Antenna Tuning

Tri-band vertical antenna without ladders

Three-element vertically polarized directional antenna

Simplified Power Amplifier Load Resistance Calculation

144 MHz Band Power Amplifier

Effective antenna for 160 (80) meters

Effective Grounding Systems for Vertical Antennas

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Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

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The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

Men get the flu more than women 08.01.2018

Scientists at Memorial University of Newfoundland in Canada studied scientific papers on the epidemiology of viral respiratory diseases, including influenza, and stated that men are more difficult than women to survive seasonal colds.

In English there is an expression "male flu", which the Oxford and Cambridge dictionaries define as "a cold or similar mild ailment experienced by a man who exaggerates the severity of symptoms." If everyone believes that men exaggerate the severity of their condition, then their complaints may be paid less attention; because of this, men may receive insufficient treatment. According to statistics, more men die from respiratory diseases than women.

Scientific studies have shown that the immune response of female mice to infectious respiratory diseases is stronger than the immune response of males. These data led to the hypothesis that female sex hormones enhance the immune response. This assumption was confirmed by other studies, the authors of which showed that the female hormone estradiol weakens the pathological immune response, but increases the influx of immune cells into the lungs.

Scientists pay attention to publications proving that women tolerate certain types of flu shots easier than men. What evolutionary mechanisms are behind the different resistance of men and women to influenza is not known, in addition, most of the experiments were carried out on mice, not on humans, and human studies often did not take into account factors that affect the state of the immune system, such as smoking, and willingness to seek medical attention.

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