Free technical library. Articles from the magazine HF and VHF, 2007

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Contents of journals with annotations / Magazine HF and VHF

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Alphabetical list articles with annotations, from journals published in 2007 in the journal KV and VHF:

2-element 15m or 20m loop antenna

3-element wave channel with all active elements

B4 - 4-band direct conversion CW transceiver

DSB Direct Conversion Mini Transceiver

GP Beam Controlled

MiniYES - single-board transceiver path

QRP CW mini transceiver

Taurus: QRP SSB transceiver

Smooth range oscillators

Antennas with switchable radiation pattern

Antenna tuner for all HF bands

AGC for UA1FA transceiver on 160 m

No ringing

Transformerless Power Amplifier for QRP Transceiver

R-143 radio station power supply

World hardware magazine (Logbook of the world)

RF limiter

Finalization of the electronic telegraph key

Calibration of measuring instruments

HF Antenna Delta

HF transceiver Ten-Tec Orion II, model 566

Compact Yagi range 2 m

Compact multi-band HF antenna

Structural reasons for increasing the level of noise, fluctuations and instability of electronic equipment,

The contour of the radio station Kama-S

Multi-band antennas EW8AU

FT-840 Transceiver Upgrade

Directional Antennas

Directional HF Antennas BMA5 and BMA6

Low pass filter for CW reception

[1] [2]

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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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Random news from the Archive

Today's old people are smarter than before 14.09.2015

Researchers from the International Institute for Applied Systems Analysis published two papers in Intelligence and PLoS ONE comparing the changes that occurred in the older generation over a period of 6 years, from 2006 to 2012. In both cases, we are talking about people aged 50 to 90, only in one article they are Germans, and in the other they are British. They were tested both physically and mentally, and it turned out that the cognitive abilities of older people improve over time. This is not about the fact that the older a person is, the smarter he is, but that 80-year-old men and women of the “2012 model” demonstrate greater mental mobility than 80-year-olds from 2006. In general, the mental abilities of modern people over 50 are 4-8 years younger than themselves.

This can be explained quite simply: the complication of life, the emergence of new ways of communication, easy and quick access to a wide variety of information keep cognitive abilities in good shape until old age. We can say that the human brain began to age more slowly due to the diverse information environment. Generally speaking, there is a wealth of neuroscience and psychological research on how active brain work helps keep your mind sharp beyond retirement.

On the other hand, there is the so-called Flynn effect - a phenomenon expressed in a gradual increase in intelligence quotient (IQ) both in individual countries and in the whole world. And the new smart old people, as a special case, fit well into the Flynn effect.

However, one should not forget that such studies are often of a statistical nature, and causal relationships must be judged with caution here. The same increase in IQ, according to some reports, has recently sometimes slowed down and even reversed, if not around the world, then in some countries. In addition, we have not yet said anything about changes in physical health in older people of different generations, and they, according to the authors of the work, demonstrate the opposite trend, that is, the old people of 2006 felt better than the old people of 2012.

New generations of older people are getting smarter, but they are also getting sick more often. This is probably due to the fact that we have generally become inactive, for the most part we sit at a computer or lie down with a laptop or smartphone, which is why overweight and everything else arise. So intense mental efforts to master the information environment are in conflict with physiology, and especially such a contradiction, one must think, manifests itself with age.

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