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What is a table (grid) of frequencies?
Why is a frequency grid required? Why I can’t use frequencies directly?
How to use the frequency table? Continue reading “Table (grid) of frequencies for radio stations of CB (civilian) range 27 MHz”
The article discusses the characteristics and selection criteria of a filtering jug (pitcher) for the home, the similarities, and differences of different pitchers.
In a previous article, we examined various devices and systems for treating drinking water. The question that was also considered there – why is it necessary to purify “drinking” water from the tap. We made sure that such water, without additional filtration, may be quite safe, but rarely has characteristics suitable for direct consumption, as well as for the preparation of culinary dishes and drinks.
Now we will dwell on the review of the most simple and popular device for purifying drinking water – a filtering jug. As a rule, a filtering jug has a low price (from 17 to 25 euros for a product of good quality, without unnecessary “bells and whistles”). At the same time, it does not need to be connected and installed, you can quickly start using it, it is easy to find replaceable modules, and it is easy to take with you on a trip.
Continue reading “FILTERING PITCHER IS A SIMPLE AND SUFFICIENTLY EFFECTIVE DEVICE FOR PURIFICATION OF DRINKING WATER.”
The article discusses the main ways of filtering drinking water at home: a filtering jug, flow filter, and reverse osmosis installation. Photos and technical details courtesy of Aquaphor.
In most developed countries, there are standards for drinking water supplied to residential buildings. However, water quality control is usually carried out at the exit from a centralized filtration system. And then the water goes a long way until it reaches the tap in your kitchen. This path runs through many kilometers of pipes, most often laid many years ago. Some of these pipes are iron, hence a metallic taste, rust, and other oxides appear in the water. Copper pipelines are also found in homes – they themselves are durable, but oxidized copper is also not good for the body.
In addition, dirt accumulates in any pipes (including modern polymer pipes). Where does it come from? In case of accidents and damage to pipes underground, the soil erodes, and together with water it enters the pipe and spreads throughout the entire branched system. When repairing a damaged pipe, of course, it is replaced, but it is no longer possible to flush the entire system perfectly. Imagine how much sediment settles in pipes in 10 or 20 years! This dirt is the habitat of various bacteria and other microorganisms. If the water is chlorinated, this inhibits their development, but chlorine and chlorides in themselves are harmful substances.
Even if the water in the tap meets basic hygiene standards, its appearance, smell and taste may be far from ideal. In particular, the calcium content may not exceed the norm, but it can leave white marks on dishes, precipitate when boiling, create scale and spoil your household electrical appliances. In addition, excessively hard water negatively affects the life of the body, as it causes a violation of the acid-base balance in physiological fluids.
Continue reading “DRINKING WATER PURIFIERS AND FILTRATION SYSTEMS – A COMPARATIVE REVIEW”
If we are talking about CB radio communication in the range of 27 MHz (Citizen Band), you can buy the most expensive radio and the most efficient antenna, but the practical work of this kit will depend on the correct and optimal installation in the car.
The power supply of the radio must be connected respecting mandatory compliance with polarity (usually the red wire – “+”, black – “-“).
If the voltage exceeds 15V, the power supply to the radio should pass through the LINEAR converter. A pulse converter can be a source of interference and interfere with reception even if it is not connected to the radio.
It is recommended to power [+] wire from the battery through a separate fuse and [-] wire – from the ground of the machine near the place of installation of the radio. If the [-] wire run from the battery, it must also be protected by its own fuse.
The nominal value of the fuses must correspond to the design current of the radio.
The radio must be placed in a convenient and accessible place, and the speaker must be open.
The radio and antennas require periodic inspections and maintenance, so you need to install them so you can quickly remove them.
The antenna must match the radio frequency.
If the antenna is installed higher and near the center of the machine, it works better (see diagram). Please note that installing any antenna in a bad place can result in a loss of more than 3 decibels of gain, which is equivalent to losing half the total power radiated by the radio transmitter.
The antenna must be installed vertically. There should be no metal parts near the pin (whip).
Mortise antenna designed for installation on a metal surface. If it is mounted on a bracket, it is necessary to ensure the contact of the antenna base with the ground of the machine: clean the paint on the antenna joints with the bracket and the bracket with the bodywork, and tighten the screws. Otherwise, the antenna will malfunction.
If the antenna is good, properly installed, but does not work well for transmission, it may not be tuned by SWR on a specific channel. Verify, configure.
If the metal surface of the installation has an insufficient area for the antenna or an irregular shape, tuning and proper functioning of the antenna may be impossible.
Any damage, even minimal, to the antenna cable can break the connection and cause the radio to fail.
The antenna’s threaded connections require periodic cleaning and the hidden cavities require drying.
It is normal to face spots with abnormal noise levels (for example, near the electric wires, office buildings (which have a lot of computers), etc. But if the noise level during the reception is too high everywhere, you should find and eliminate the source of interference within the car (it can be a pulse DC/DC or DC/AC converter, a led lamp, abnormal xenon, etc.)
Please note that the most optimal solutions in the field of telecommunications or civil radio communication can be found in the online store http://ProMarket-EU.com, as well as on Amazon.
