A simple converter for receiving television MMDS 2,5-2,7 GHz. Scheme, description

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A simple converter for receiving television MMDS 2,5-2,7 GHz. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Телевидение

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This converter differs little from its symmetrical brother. Capacitor C3-cut from the board 3x12 mm 1,5 mm thick across the base output VT1, soldered to the base and ground. C14 flag made of tin near the VT3 emitter. All lines are raised above the board by 2 mm. +12 V power is supplied via a drop cable through a filter similar to C21L7C22. R5 for setting the VT4 mixer to the quadratic section of the characteristic. Decoupling capacitors, together with their terminals, must resonate at the mid frequencies of the signals passing through them. In connection with the interest shown in this converter, I put it on the scanner. The depth of field is of course small, but you can see something.

A simple converter for receiving television MMDS 2,5-2,7 GHz, installation

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A simple converter for receiving television MMDS 2,5-2,7 GHz

Author: E.Shustikov, UO5OHX ex RO5OWG; Publication: shustikov.by.ru

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FGF21 injection helps sober up 13.03.2023

American researchers sobered mice by injection of the hormone FGF21, which reacts to the introduction of ethanol into the body. The connection allowed the animals to regain consciousness and coordination of movements twice as fast.

The FGF21 hormone is produced by the liver under the influence of a number of stress factors, such as starvation, lack of protein, or the action of ethanol. Previous studies have shown that the compound protects the liver from damage due to alcohol consumption, as well as reduces alcohol cravings and encourages drinking more fluids to prevent dehydration. Behavioral change means that the action of the hormone crosses the blood-brain barrier to the brain. Scientists at the University of Texas Southwestern Medical Center and colleagues decided to clarify the mechanism of its action.

First, the scientists heavily ethanoled two groups of mice - normal and blocked by the hormone FGF21. Although within 15-20 minutes they all became intoxicated and lost the ability to navigate in space, it took 1,5 hours longer for the modified animals to recover the reaction. At the same time, the rate of elimination of alcohol from the blood of animals was the same. Therefore, FGF21 protects against the consequences of ethanol consumption, but does not affect its metabolism.

In the next experiment, an hour after drinking, when the mice were already unconscious, half were given an injection of the hormone. As a result, consciousness and orientation in space recovered 1,5 hours faster than those who did not receive injections, and this is equal to a reduction in the time of intoxication by about 50 percent. The action of FGF21 appeared to be specific to ethanol, as it did not promote sobering after sedative compounds such as ketamine, diazepam, or pentobarbital.

The researchers found that the effect of FGF21 is due to its effect on the noradrenergic neurons in the locus coeruleus - parts of the brain that regulate arousal and alertness. This means that targeting these neurons, mimicking the action of FGF21, could help bring people out of high inebriation. But whether the mechanism of the hormone will work in humans in the same way as in mice should be clarified in the following studies.

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