Chapter 14 Ore Radio

This time, Lin Hong seemed to have entered a mysterious state. Unlike the muscle pain in his whole body as before, he felt very comfortable this time.

Two hours passed quickly. Lin Hong closed his momentum and exhaled deeply. His mind was unprecedentedly clear and refreshed.

He locked the door and trotted home to make breakfast.

Because today is Sunday and he doesn't have to go to school, he immediately returned to the waste collection station after breakfast.

This time, he held a rectangular brown wooden box in his hand, and there were several round holes on the box.

It is the "ore radio" he has been making recently.

In fact, his ore radio has been able to make sound for a long time, but due to the problem of coils and ore sensitivity, he can only receive a local radio station in Dongling City, and the sound is very unclear, and the noise is too heavy to be used normally.

However, it really made Lin Hong excited for a long time.

The next days are a process of continuous improvement. For example, the components of the radio were scattered before, and there was no special box at all.

Later, Lin Hong went to the car and wood factory for a few days. When everyone didn't pay attention during the break, he made such a long strip of box with the remaining waste wood in the factory. After all, his father is an employee of the car and wood factory. He often follows him, and it's easy to make a simple box.

These days, Lin Hong has also read a lot of information. He learned that in order for the ore radio to receive more stations, the sound will also become clearer. First of all, it is necessary to have a very good heaven and earth line, and the Q value of the coil and variable capacitor is higher the better. In addition, the positive pressure drop of the High-imped headphones with appropriate impedance, and their radio reception effect is even better than those professional radios.

The finished product in his hand at this moment is the only thing he has not solved after his careful improvement these days. The only thing that has not been solved is the heaven and earth line, because to make a better antenna, it requires a long metal wire and a huge space. In addition, Lin Hong saw in the book that although the antenna is simple, it is It is easy to attract thunder and lightning, which is very dangerous.

Therefore, without certainty, Lin Hong did not make the antenna without authorization for the time being.

When Lin Hong came to the waste collection station, Lao Xu had not yet returned home.

He carefully observed the antenna made by Lao Xu's head in the yard last time and found that most of the materials used were wire. There were a total of twelve wooden poles in the yard, which were divided in a rectangular shape in a corner of the yard, of which several poles were erected outside the yard.

What made Lin Hong feel strange is that the length of these wooden poles is not the same, but arranged in order from low to high order. The wires on the poles are intertted with each other, forming a long strip of fishing net-like iron net, which is very spectacular.

Lin Hong knows without guessing that these antennas are not casually entangled. They must have been calculated by precise formulas, and every angle is exquisite.

There are a lot of books about antennas on Lao Xu's bookshelf, but Lin Hong hasn't seen them for the time being. Therefore, when he looks at the design of this antenna now, he is not very clear. After a long time, Lin Hong knew what kind of antenna this kind of antenna was.

In the end, Lin Hong found a discharge tube and resistance at the terminal of the antenna, which was connected to the ground wire. He knew that this was Lao Xu's lightning protection design, so that even if the lightning in the sky was led down, the lightning could be smoothly introduced into the ground without damaging the equipment, and even The risk of lightning strikes.

After observing for a while, Lin Hong came to Lao Xu's room. He put the "ore radio" he made on the workbench, then removed the antenna on the radio, and finally connected it to his "mining machine".

Turn on the switch, and the tongue spring headphones on the lid of the wooden box make a rustling sound.

Originally, Lin Hong wanted to use the speaker on the radio to make headphones, but later he found that the effect was not ideal. Finally, he found the tongue spring headphones model Tian 737 on a shabby and strange hat at the waste acquisition station, and found that the effect was good. Later, he also read an article in the magazine about headphones suitable for miners, which introduced that the impedance of this kind of headphones is up to 750 euros, which is just suitable for "miners".

Lin Hong kept adjusting the position of the metal pointer on the ore, which was the detector on the "miner". The sound in the tongue spring headphones began to change constantly, and the ambiguous sound of various radio stations gradually appeared.

"Sure enough."

Lin Hong nodded with a smile. After connecting to Lao Xu's antenna, the listening effect was greatly enhanced. As soon as he adjusted it casually a few times, he had heard several radio stations, one of which was still in the provincial capital, which was very far from here.

He continued to adjust carefully. Finally, the voice of the announcer of the "Central People's Radio" came from the headphones, and the sound quality was very good.

"Great!"

Lin Hong cheered, jumped up with joy, clenched his right hand on his chest, and made a gesture of victory.

This is a radio wave from the capital of Beijing, which is more than 1,000 kilometers away from here. The most critical point is that this is the radio he listened to through his own "ore radio".

After Lin Hong was excited, he calmed down. He began to try to search for more radio stations, such as foreign radio stations and his favorite amateur radio stations.

The final result is frustrating. He can't receive foreign radio stations or even amateur radio stations like Lao Xu's radio station. Being able to listen to Beijing's radio is already the limit of this miner.

In fact, he had expected such a result for a long time. After all, this has been clearly stated in the magazine for a long time, but he still has some fantasy in his heart.

"The ore radio still has certain limitations." Lin Hong recalled what he had learned, "No matter how good the antenna is, the wavelength received is also very limited. It seems that if you want to receive a wider band, you need not only to make a good antenna, but also improve other aspects."

The radio stations he receives now belong to long-wave radio stations, and the frequency is generally relatively low. In order to receive higher frequency bands, such as amateur radio signals, the ore machine cannot meet the requirements at all. Only by replacing them with higher-performance components can it be able to receive signals such as amateur radio bands.

However, Lin Hong is still quite satisfied. The ore radio has been successfully made by him, and in the process of production, some of the problems he encountered were basically solved by himself. In the process of solving these problems, he also learned a lot and practiced the theoretical knowledge in the book, which felt very good.

Next, Lin Hong's plan is to make a better antenna so that he can listen to the radio at home at night. In the process of reading, he found that he often encountered English words. After all, these technologies were first developed from abroad. Whether it is books or magazines, a lot of content is directly translated, and some basic terms are even written directly in English.

Therefore, Lin Hong's other plan is to learn English by himself. He found that at night, some radio stations would broadcast some English teaching programs, so he decided that the important role of the ore radio after production was to listen to these English teaching programs. And when the performance improves in the future, when you can directly listen to foreign radio stations, you will insist on listening to the original foreign radio broadcast programs.

When he went back for lunch, Lin Hong took the "mining machine" back by the way. After dinner, he came back to continue reading.

The books he read this time are related to the antenna. He checked some information and decided to make an "Yagi antenna" for the time being.

"Yagi Antenna" is also known as "Yagi Uda Antenna" is a directional antenna designed by Japanese antenna experts Yagi Shuji and Uda Tairo. It has the advantages of high gain, strong directionality and simple structure. It is quite convenient to make materials, which is very in line with Lin Hong's current conditions.

Throughout the afternoon, Lin Hong was reading a book called Yagi Antenna Making Tutorial, which introduced the basic principles and production methods of Yagi Antenna in detail.

Just as he saw the end of the book, a noisy voice suddenly came from the outside yard, and it seemed that a lot of people came.

Lin Hong put the book back in place and went outside to see that it was Lao Xu who came back, and he was not the only one. A group of very eye-catching faces came. Lin Hong was sure that these people were not from Black Rock Village or nearby villages. Looking at their clothes, they looked like city people.

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