Go back to the past and be a schoolboy

Chapter 272 Ore Radio

Shanghai, near Xujiahui Longhua, in the attic of a three-story building.

"Yulin, have you bought the ore? Our radio club is waiting for you, the core component. With it, our radio will be able to work immediately. We are looking forward to the technology recommended by the famous Professor Cheng!"

As the backbone of the Shencheng Boy Scouts, Xi Kangfu has a strong interest in radios, especially after reading a few articles about this in the magazine "National" he subscribes to, he can't wait to build one right away, especially from The ore radio introduced by Cheng Nuo was even more eager to try.

Fa Xiao Zhang Yulin secretly unbuttoned his chest, exposing the slit, and pointed to the inside triumphantly: "Don't worry, in order to find a suitable ore, I spent a lot of effort, and finally got such a big piece of it." .”

Originally, he wanted to continue to show off the ore, but the shape of the ore was irregular, and it was too uncomfortable to put in his clothes. After saying this, Zhang Yulin quickly took it out and put it on the table.

"So big? Where did you get it? You are too powerful!" Xi Kangfu looked left and right at the ore, picked it up and couldn't put it down: "I remember when we went to the Chinese medicine shop to ask about this thing, it wasn't like that OK!"

After Zhang Yulin saw that there were no outsiders outside the door, he whispered: "Hey, this thing is in stock of my old man, and its effect is better than that sold by the traditional Chinese medicine shop, and it seems to have an exclusive name, what is it called Shan... What was flashing, and I forgot it when it came to my mouth.”

Xi Kangfu blurted out: "Sphaerite!?"

Zhang Yulin was pleasantly surprised: "Yes, I remembered it. It's called sphalerite. Professor Cheng specifically said that this stuff is more effective than the stuff from the traditional Chinese medicine store. I just remembered that the old man had this stuff, so I used it directly." Now, we can use the remaining money to buy other parts."

From the perspective of mineralogy, it belongs to the sulfide minerals with zinc as the main component, and is mainly used as ore for smelting zinc materials.

It contains more iron components, so the color of the original stone is basically strong brown and black.Only some extremely rare rough stones are transparent in beautiful colors such as orange, yellow, and green.

Because of its strong luster, high refractive index, and good transparency, those without cracks can be used as gemstones after pondering, but they are relatively rare. If the color of sphalerite is green or red and other rare colors, the ornamental value is higher.

As for Zhang Yulin, the sun shines on the ore through the attic window, reflecting red and yellow light. Even a layman who does not understand sphalerite will have to guess that this thing is valuable.

The more Xi Kangfu looked at it, the more anxious he became. He wanted to hold it with one hand but was afraid of breaking it, so he held it in both hands and handed it to Fa Xiao: "Yulin, I think this thing is expensive. Don't let us spoil it. When the time comes, uncle It's not easy for us to do business there!"

Zhang Yulin is well aware of his father's disposition, and of course knows that what can be collected back will definitely not be something ordinary, but now that he has already taken it out, he really doesn't want to just give up like this:

"It's okay. The old man is busy working with cotton and iron, and he has to mix it with flour later. He is too busy. It is common for him not to go home for a few days and nights. How could he think about this ore? Listen to me." , let’s do it quickly, we’ve been preparing for such a long time.”

Xi Kangfu felt that something was wrong, and felt that what he was holding in his hand was not an ore, but a hot potato:

"I still think natural copper from traditional Chinese medicine shops is fine. Although it costs money to buy, we can still afford it by slowly saving pocket money. You can rest assured that you can use your own. There is really no need to take this risk."

"Why are you such a mother-in-law? I will be responsible for any problems. At worst, I will have another meal of fried meat with bamboo sticks." Zhang Yulin was a little impatient, and directly snatched the ore: "The Chinese medicine shop can't be used at all. Professor Cheng's article introduced Let’s say it has fewer detection points, its sensitivity is average, and its stability is just barely enough for beginners.”

After saying this, Zhang Yulin directly bypassed Faxiao, walked straight inside, came to the table and put the ore on it, pulled out the drawer and began to search for other parts of the ore radio.

"Antennas, ground wires, ores... By the way, what about earphones? You can't do without earphones!"

Xi Kangfu had no choice but to resign himself to his fate, and followed him to the table, found a box, opened it and displayed it in front of the two of them.

"If you can't find a better headset, use this first."

"This is the earphone you mentioned? Ah Fu, Ah Fu, you are so talented. Why didn't I think of using this as an earphone?" What was placed in front of Zhang Yulin was not a professional earphone at all, but a telephone receiver. This thing was amazed: "Could it be that you dismantled your father's phone?"

"I'm not you. I'm as brave as the sky. The phone at home was broken earlier. My dad just bought a new one to replace it. The old one was left unused. I thought about treating a dead horse as a living horse doctor, repairing it." If it’s not good, forget it, and if it’s repaired, won’t it save a lot of money?” Xi Kangfu quickly denied it.

After hearing this, Zhang Yulin couldn't help but thumped Fa Xiao's chest, pointed at the bells on the table and laughed loudly: "I am not convinced by others, but you, Fu, I am convinced, no wonder you want me to put The ore is returned, and it is really out of place to put it in so many parts!"

It’s no wonder Zhang Yulin said that the things on it are basically “junk” picked up. The small box used to fix the ore is a bottle cap. It is connected by waste wires, which can be called a centralized recycling of waste products.

But I am a radio enthusiast. Although these things look broken, in the eyes of Xi and Zhang, they are all big treasures. Even if they are worn out, they don’t feel bad. Two sets came out.

"Yulin, do you think Professor Cheng's method is effective? The consumables are cheap, but they are too cheap." Xi Kangfu wondered while busy with the work in hand.

Zhang Yulin didn't even think about it, and replied directly: "You don't have to believe me, but you can't believe Professor Cheng, right? Every issue of "National" magazine publishes small scientific experiments. Let's follow the above steps and do them all. It's done."

Xi Kangfu tilted his head and thought for a while, then said thoughtfully: "That's right, those failures were basically because our operations were not standardized, and things were fine, but I still can't understand why the materials must be cheap. Yes, it stands to reason that the fixed one can use a better glass tube?"

"That's what you said, the glass tube is more beautiful." Zhang Yulin stopped his work and agreed with the question raised by Fa Xiao, but after scanning all the "broken" ones, he instantly understood the process. Nuo's intention: "I think, I understand Professor Cheng's thoughts."

Xi Kangfu immediately asked, "What do you think?"

Zhang Yulin's tone was full of reverence: "If I'm not wrong, Professor Cheng is thinking that the cheaper things are, the easier it is for radio technology to be popularized, and more friends whose families are not as good as ours can also experience the benefits brought by technology." Come the charm."

Originally, Xi Kangfu still had some mental problems, but he looked at the old wires in his hand and muttered to himself: "The magazine "National" is so cheap, "Dictionary of Mathematics" is half sold and half free, and the work-study classes in France are all free... ...I should have thought of that earlier!"

Zhang Yulin sighed, patted Faxiao on the shoulder and said, "It's nothing. It's not too late to know now. When we successfully manufacture it, it will also help Professor Cheng to promote it. Now we have to hurry up and make this ore radio Get a thorough understanding of the technology and strive to win the first battle."

After this little episode, the two speeded up the movements in their hands, and the ore radio in their hands began to slowly take shape.

According to Professor Cheng's introduction in the article, the waste wires are turned into a spider web, and they are passed through the attic window to the roof, and it is raised high in the air.

As for the ground wire, it is simple. It is directly connected to the water pipe. Because it is made of metal, it also reduces a lot of work for two people, and the effect is very good.

After a series of operations were completed, the two squeezed in front of the microphone, looking nervously at the clock on the wall.

"It's twelve o'clock?" Xi Kangfu swallowed unconsciously.

"No, it's still 2 minutes away." Zhang Yulin carefully counted the hands on the clock face, and said nervously: "To be precise, there are still two minutes and 13 seconds left."

"Then Professor Cheng's "National Radio" should be broadcast on time?" Xi Kangfu asked.

"If we remember the time correctly, the first experimental broadcast will be broadcast for an hour at 12 o'clock, and the content is not yet known." Afraid of missing this critical juncture, Zhang Yulin spoke quickly: "Yes, I will not remember wrongly , it will definitely be at 12 o'clock, we just wait."

Suddenly realizing that what Fa Xiaogang said was wrong, Zhang Yulin suddenly turned around: "It's not called "Radio", it's called "National Broadcasting". Professor Cheng said that we can't get used to using the old familiar media experience and knowledge to imagine and experience a new medium!"

Xi Kangfu scratched his ears, and whispered: "It's not me calling radio, but everyone calling radio, thinking to follow the crowd..."

It's a pity that Zhang Yulin interrupted him before he finished speaking, with a loud voice: "Hurry up, it will be 12 o'clock soon, hurry up and control our ore radio, and listen to the National Unlimited TV... Bah, everyone has been caught. You got it wrong, National Broadcasting!"

After receiving the instruction, Xi Kangfu ignored the small complaints and quickly moved the pointer to catch the signal in the air.

But after all, it was the first time for the two of them to use the ore radio, lack of experience, and the upper limit of the performance of the ore radio was low, the hands were dialed for more than half an hour, but there was still a lot of noise, and the legendary "National Broadcasting" could not be found at all.

Watching the pointer on the wall move back little by little, it was almost one o'clock in the afternoon, and the daily experimental broadcast was coming to an end. In such a cold day, Zhang Yulin was so anxious that he was sweating profusely, and couldn't help it. Immediately urged: "Ah Fu, what's the matter?"

Xi Kangfu frowned and shook his head to express that he hadn't succeeded yet.

Glancing at the watch on the wall, and then at the ore radio on the table, Zhang Yulin looked extremely anxious: "What is the problem? Why hasn't the signal been caught until now? It doesn't make sense at all!"

Xi Kangfu bit his lip and said softly: "Could it be that we have overlooked some details in the book? As a result, we have been unable to receive the signal."

Zhang Yulin shook his head again and again: "Impossible, I can memorize the article almost, it is impossible to miss any knowledge points, it should be that the oscillating current of equal amplitude acts on the open transmitting circuit through electromagnetic induction, because the antenna circuit is connected in series. There are charcoal microphones, and when the sound waves hit..."

Just as Zhang Yulin deduced the principle of the ore radio, he suddenly heard an unusual sound in his ears, and immediately stopped. Introduction to the principle:
"Slow down, Ah Fu, move forward a little bit."

"Is it this one?"

"No, dial it a little further."

"what about this?"

"After it's over, dial back a little bit, yes, it's here, slowly, slowly..."

After a few words, when the two of them tightened their mouths and listened carefully, a weak voice came from the microphone.

After the two looked at each other, they suppressed their excitement and continued to move the pointer slowly. The voice in the microphone became clearer and clearer, and finally they could clearly distinguish that it was Peking Opera.

"I...we are...successful?" Although Xi Kangfu covered his mouth, he still couldn't hide the excitement inside and outside the words.

"Looking up suddenly, I saw the clear moonlight in the blue sky, the clouds gathering in the clear sky, and the ice wheel suddenly surging..." Zhang Yulin sang along with the chirping sound on the radio, and then hugged him heavily: "It's hard to hear Peking opera in Shanghai. Of course we succeeded!"

At this moment, the hour hand of the wall clock finally pointed to "1", and the bell began to ring from inside.

The Beijing opera on the radio also came to an abrupt end, and then a voice of an announcer with a round accent came from inside: "Hello, listeners, this is the end of today's "National Broadcasting", and welcome everyone to continue listening to the radio at the same time tomorrow." !"

With the official approval, Xi Kangfu hugged Fa Xiao directly: "We succeeded, we successfully heard the voice from afar, these days' hard work was not in vain, we are doing well..."

At this time, Zhang Yulin was relieved and greeted with an unprecedented sense of satisfaction. He seemed extremely calm and tried his best to appease Fa Xiao: "Slow down, slow down, we haven't packed up yet, if we knock the pointer off later, That hard work will be in vain.”

Xi Kangfu quickly calmed down: "Yes, yes, it is not easy to find this signal, and we can't jump into the same pit again, but what should we do next, just leave it alone?"

Zhang Yulin held his chin and thought for a while, and then he said firmly: "Of course not, the reason why we couldn't listen to it in time just now is because in addition to the audio frequency current we need, there is also high frequency current in the circuit. We have to find a way to give them Filtered……"

While the two were still discussing the direction of the next experiment, they didn't know that the crooked antenna on the attic had already attracted the attention of others. You must know that this place is a military security zone two miles away. place of work.

Right now it is the confrontation between the North and the South, and we are in a state of high tension for this kind of equipment, especially when we see antennas near the garrison, it is easy to associate them in some bad directions.

On Cheng Nuo's side, he was still in the radio laboratory, busy debugging the radio equipment with Tesla and the others. He had no idea that some fans in Shanghai had already received the radio, and the effect was so good.

As for those articles, they are more forward-looking and like to publicize, which is unintentional.

He underestimated his own charm and ignored the curiosity of the teenager.

(End of this chapter)