Improvements to the RA3AO transceiver. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Improvements to the RA3AO transceiver. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Civil radio communications

Comments on the article

It is quite easy to enter the RIT / XIT mode into the transceiver. I excluded the AGC time switch and used it for this purpose. According to the diagram, these are the wires coming from the contacts of the A19 (TX) NN 11, 12 board, are connected to this switch (P2K), in the RIT mode they go as usual, and in the XIT mode (the switch is pressed) they change places (Fig. 1 ).

Improvements of the RA3AO transceiver
Ris.1

When docking TRX with an amplifier on the GU74B, I use the circuit in Fig. 2, which largely repeats the well-known circuit, but here the L1 coil is switched on in a different way. It is connected only on the bands 18 - 30 MHz, and on 14 and below it is turned off. L1, together with the input capacitance of the tube, forms a circuit tuned to 25 MHz and has a bandwidth of 3 dB 10 MHz, which makes it possible to compensate for the blockage of the frequency response at these frequencies. Coil L1 - frameless wire 1mm, winding diameter 8 mm, 12 turns, adjustment is made by moving the turns apart.

Improvements of the RA3AO transceiver
Ris.2

Author: S. Ershov (UW3TU), Nizhny Novgorod Publication: N. Bolshakov, rf.atnn.ru

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Men who are unlucky in romantic affairs should probably eat more garlic, according to researchers from the University of Stirling and Charles University in Prague. The experiment involved 42 men and 82 women: the men were offered either garlic with bread and cheese or garlic extract capsules (of course, the control group did not eat either), after which they took scent samples and let the women smell them, who they had to say later how pleasant this or that smell is to them and how attractive and courageous its owner seems to them.

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Apparently, the same mechanisms are involved here that help animals evaluate a potential marriage partner by smell. To leave healthy offspring and to successfully raise it, both parents must also be healthy, resistant to infections, etc. And in garlic there are bactericidal molecules, and antioxidants, and substances that reduce the likelihood of cardiovascular disease, and much more. another (although it should be noted that so far not all the beneficial properties of garlic have been proven in medical research). The one who eats garlic seems to be healthier, and therefore more suitable for becoming a father.

Someone will say that humans do not have such a good sense of smell to, like other mammals, read such information by smell. However, smells can influence our behavior even when we are not aware of it. The most famous example of this kind is the so-called "smelling T-shirt experiment": in 1994, the Swiss biologist Klaus Wedekind found that women, by body odor, choose those men who have the right immunity, those who would help develop a more perfect immune system in children. .

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