Free technical library. Articles from the magazine HF and VHF, 2010

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Contents of journals with annotations / Magazine HF and VHF

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Magazine HF and VHF

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Alphabetical list articles with annotations, from journals published in 2010 in the journal KV and VHF:

11-element wave channel at 144 MHz

160 meter shorty

FLEX-3000

Double longitudinal reflection antennas

Resistance variometer

Vertical without radials

Output oscillatory system of tube power amplifiers

Push-Pull Tube HF Power Amplifier

Divider for encoder

Band pass filters

Looking for a quartz resonator

Inductors on toroidal cores

HF transceiver FTDX5000D

HF triplexer

Classic Beverage Antenna

Code converter for DDS local oscillator of SDR transceiver

Short vertical at 80 m

144/14 MHz tube transceiver

Microphone amplifier-limiter

Optimal counterweight system for vertical antennas

The main path and power amplifier of the Klopik K2 transceiver

Sports DF transmitter

Increasing the durability of generator lamps

Increasing the selectivity of RPU on VHF

Increasing the electrical strength of the interelectrode gaps of generator lamps

half wave resonator

Practical constructions of the direct conversion technique

Bekas-M transceiver

Let's adapt the headset for a personal computer to the radio station

Simple vertical transducer for 2 m and 70 cm bands

Simple mic equalizer

A simple transmitter for hunting foxes in the range of 80 m

Simple receiver for hunting foxes in the range of 80 m

Simple Direct Conversion QRP CW Transceiver

[1] [2]

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Fullerenes can be dangerous 14.08.2004

Preliminary studies by American hygienists suggest that fullerenes - round hollow molecules consisting of several dozen carbon atoms - can be harmful to the body.

Fullerenes were first obtained in 1985; they can be used in microelectronics, as an additive to lubricants, in fuel cells. Pharmacists want to use these nanometer-sized beads (a nanometer is one thousandth of a micrometer) as supermicroscopic pills, filling them with drugs and injecting them into the patient's bloodstream. They are also used in cosmetics, filling with cosmetics.

However, experiments on fish conducted at the University of Dallas (USA) have shown that fullerenes can accumulate in liver cells and brain neurons, changing the functioning of genes in these cells and damaging cell membranes.

The degree of toxicity of ultramicroscopic carbon balls is estimated as average between nickel and benzopyrene, a carcinogen found in tobacco smoke and car exhaust. If you add fullerenes to the water with daphnia floating in it at a concentration of only 0,8 milligrams per liter, after two days half of the daphnia dies.

According to unpublished data of other researchers, fullerenes are also toxic to rodents.

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