HF and VHF Journal Articles, 2001 at the Free Technical Library

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Alphabetical list articles with annotations, from journals published in 2001 in the journal KV and VHF:

LF in KATRAN radio receiver

MFSK - communication of the new millennium

QRP transceiver on 40m band

RTTY and MMTTY V1.61E

RTTY from WF1B - version 5

Do you use hardware magazine for PC?

Anode choke - pros and cons

Anode choke with nichrome

Antenna 144.146 MHz

144 MHz Antenna

Antennas of a poor radio amateur

Antenna preamplifier at 430 MHz

balance mixer

Transformerless Power Amplifier

Transceiver mixer block

Control unit for radio station Angara

Antenna matching device option

VHF HF bridge

Generator triodes GI-7B, GI-7BT, GI-70B, GI-70BT, GS-35A, GS-35B

Generator tetrode GU-77B

Generator tetrode GU-78B

Dual-band antenna for low-frequency bands

P-loop remote control

Protection of powerful generator lamps

Meet PACTOR Mode

Switching power supplies for the transceiver

How to choose a teletype program

Katran - VHF device

HF transceiver Mark-V FT-1000MP

coaxial relay

Bieffe coaxial microwave cables

Band converter 144-146 MHz

Design of microwave devices on microstrip lines

Antenna phasing method for 160, 80 and 40 m bands

The method of restructuring the radio station R-105M

Multi-Range Open-Sleeve Verticals

Multiband VFO

Multi-storey cascode linear power amplifier

Modernization of the frequency synthesizer of the Mayak radio station

SB200 and FL2100B Power Amplifier Upgrades

Low pass NOTCH/CW filter

About increasing the dynamic range of direct conversion receivers

Parameters of passive frequency converters

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The sustainable way to recycle lithium-ion batteries 13.06.2021

Scientists from the Oak Ridge National Laboratory (Tennessee, USA) have found a cheaper and more environmentally friendly alternative to existing methods of cathode material regeneration.

Currently, two methods are used to recover the cathode material of lithium-ion batteries for reuse - either by heating to a temperature of 500 ° C, or by using strong acids (nitric, sulfuric, hydrochloric) and hydrogen peroxide. The first method is very energy-intensive, while the second produces a lot of toxic by-products - chlorine, sulfur and nitrogen oxides.

The problem in isolating the cathode material is to separate it from the aluminum foil, the polymer substrate, and the carbon additive. To do this, it is necessary to dissolve the polymer - polyvinylidene fluoride. There are solvents that can do this, but using them is very harmful to the health of the staff.

By immersing the cathode material cut into small pieces in an ultrasonic bath filled with triethyl phosphate heated to 100°C, which is used as a solvent, the researchers were able to separate the constituent parts and obtain aluminum foil without traces of corrosion and a cathode material suitable for use in new batteries. At the same time, the capacity of the restored cathodes was 95,5% of the base one. The decrease in capacity is explained by the fact. that the recovered cathodes contain an admixture of polymer and carbon.

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