Author: Petrosani Children's Club
Quarterly magazine of the circle of electronic constructions and amateur radio
Coordinator: Prof. Kovacs Imre - YO2LTF
Did you know that ...? Have scientists discovered that radiation emitted by cell phones can in the short term affect a user's ability to perform simple mental tasks?
The structure of the magazine
1. Mobile phone, friend or foe?
The study conducted in Great Britain, the Bristol Royal Infirmary, provided the necessary evidence showing that mobile phones can alter memory and weaken the ability to concentrate and spatial orientation.
What many mobile phone users don't understand is that they send electromagnetic energy into the brain that can penetrate the skull for a maximum distance. 3-4 cm.
Depending on how close the phone antenna is held, about 60% of microwaves are absorbed by the brain.
Of course, with the development of new generations of mobile phones and by expanding the coverage area that has reduced the power needs in the transmission and reception of mobile phones, the impact of telephone waves has been substantially reduced.
The mobile phone industry says that every phone sold is safe and respects the safety limits against radiation imposed worldwide. But tests have shown that electromagnetic radiation can exceed the radiation limits, depending on the position in which they are held.
How do we minimize the risk of exposure?
If you want to minimize the risk you are exposed to when talking on your cell phone, You have below five methods recommended by Swedish specialists:
a) "Short conversations". Avoid talking on the phone for long periods of time. Schedule your calls so that you can use your landline for longer conversations.
b) "Don't stay in the car". Talk as little as possible when you are in the car, because it amplifies the radiation. If you have to do it, place a special antenna on the hood.
c) "Protect children". Do not leave a mobile phone open near the pram. It emits radiation, even if you don't talk to it.
d) "Avoid waist". Do not wear mobile phones on your belt near your waist. This exposes your genitals or hip bones to the effect of the microwave. Placing in the heart area is contraindicated only if you have implanted a peacemaker.
e) "Directed antenna". If you have a retractable antenna, when communicating it is good to extend it to the maximum and not to hold it vertically, parallel to the head. The difference in angle reduces to a substantial degree the propagation of the waves inside the cranial box.
The degree of alteration of the neural structure or the cells of the organs subjected to radiation is all the greater as the individual spends several hours, day in front of the monitor, or with the cell phone in his ear. Studies by Swedish researchers show an increased risk of leukemia in children living near high-voltage lines.
2. Frequency meter with PIC
The need for a digital scale, or at least a frequency meter, is indisputable for any amateur radio and if it is possible to work "as high as possible" the better.
Those who approached this construction during the time of Nixie tubes, with TTL technology, then with CMOS, ECL and displays of various types, certainly remember the complexity and costs of such a construction, (time bases, counting sequences, memory, readings, counters, presets, buffers, decimal or segment decoders), and the final performance as well as reliability were more than modest, not to mention the size, energy consumption and noise introduced in the assemblies.
Fortunately for us, the technology of microcontrollers has forgotten all these difficulties, has greatly simplified the construction, due to the software, and the price is a bit more affordable…
What are stereograms?
The stereograms are two-dimensional images that hide behind them three-dimensional images until the one who looks at them correctly focuses his gaze.
Reality looks to each of us, as we have learned to look at it, but stereograms prove that there are other possibilities to perceive it. Thus, they put us in front of a disturbing question: what other dimensions of reality could be accessible to us when we learn to access them?
In order to be able to see the three-dimensional images hidden in stereograms, we need to learn to relax our eye muscles and allow them to change their focus on their own. The secret to success is to let each of the two eyes look in different places at the same time…
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