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 which our radio will be able to operate immediately, and we are looking forward to the technology recommended by the famous Professor Cheng! ”

As the backbone of the Shencheng Scouts, Xi Kangfu has a strong interest in radio, especially after seeing a few articles about this in the subscribed "National" magazine, he is even more eager to build one immediately, especially from the ore radio introduced by Cheng Nuo, and he is even more eager to try.

Zhang Yulin, who was a little haircut, secretly untied his chest, revealing a slit, and pointed to the inside triumphantly: "Don't worry, in order to find the right ore, I have spent a lot of effort to finally get such a big piece over." ”

Originally, I wanted to continue to show off this piece of ore, but the shape of the ore was irregular, and it was really panicked to put it in my clothes, so Zhang Yulin quickly took it out and put it on the table.

"So big? Where did you get that? You're amazing, aren't you? Xi Kangfu looked left and right at the ore, and couldn't put it down: "I remember when we went to the Chinese medicine shop to ask about this thing, it wasn't so good!" ”

After Zhang Yulin saw that there were no outsiders outside the door, he whispered: "Hehe, this thing is the inventory of my old man, and the effect is better than that sold in the Chinese medicine shop, and it seems that there is an exclusive name, what is it called...... What flashed something, and when it came to his mouth, he forgot about it. ”

Xi Kangfu blurted out: "Sphalerite!? ”

Zhang Yulin was pleasantly surprised: "Yes, I remember, it's called sphalerite, Professor Cheng specifically said, saying that this thing is more effective than the thing in the Chinese medicine shop, just remembered that the old man had this thing, so he used it directly, and we can also take advantage of the remaining money to buy other parts." ”

From a mineralogical point of view, it is a sulfide mineral with zinc as the main component, and is mainly used as an ore for smelting zinc.

It contains a lot of iron, so the color of the rough is basically intense brown and black. Only a very rare part of the rough is transparent, and the transparent colors are orange, yellow, green and other beautiful colors.

Because it has a strong luster, high refractive index, and good transparency, it can be used as a gemstone without cracks, but it is rarer, and if the color of sphalerite is a rare color such as green or red, the ornamental value is higher.

As for Zhang Yulin's piece, the sunlight sprinkled on the ore through the attic window, reflecting a reddish-yellow light, even if a layman who doesn't understand sphalerite sees it, he has to secretly guess that this thing is worth a lot of money.

The more Xi Kangfu looked at it, the more furious his heart became, and he wanted to hold it with one hand and was afraid that it would break, so he simply held it with both hands and handed it to Fa Xiao: "Yulin, I think this thing is expensive, don't let us play it badly, we won't be able to deal with it at the uncle's place when the time comes!" ”

Zhang Yulin knows his father's temperament very well, of course he knows that what can be collected back will definitely not be an ordinary product, but now that he has taken it out, he really doesn't want to give it up like this:

"It's okay, the old man is busy with cotton and iron cooperation, and he has to mix a foot on the flour later, he can't be busy, and it's common to not go home for a few days and nights, where would he think of this ore? Listen to me, let's hurry up, it's been preparing for so long. ”

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

"I still think that the natural copper of the Chinese medicine shop is fine, although we have to spend money to buy it, but we slowly save pocket money, we can still afford it, and we can rest assured with our own, there is really no need to take this risk."

"Why are you such a mother-in-law, I'm responsible for the problem, it's a big deal to eat another meal of fried meat with bamboo strips." Zhang Yulin was a little impatient, and directly grabbed the ore: "The Chinese medicine shop can't be used at all, Professor Cheng's article has introduced it, saying that it has fewer detection points, average sensitivity, and stability is only as good as the entry." ”

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

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

Xi Kangfu was helpless, so he had no choice but to accept his fate, followed to the table, turned out a box, opened it and displayed it in front of the two.

"I can't find a better headset, so let's use this first."

"That's what you mean by headphones? Ah Fu, Ah Fu, you are really talented, why didn't I think of using this as a headphone? What was placed in front of Zhang Yulin was not a professional headset at all, but a telephone receiver, and he was surprised when he touched this thing: "Should you dismantle your father's phone?" ”

"I'm not you, I'm guts like pouring the sky, the phone at home broke earlier, my father directly bought a new replacement, and the old one was idle, I thought about the dead horse as a live horse doctor, if it can't be repaired, forget it, if it is repaired, won't it save a sum of money?" Xi Kangfu hurriedly denied it.

After hearing this, Zhang Yulin couldn't help but beat his small chest, pointed to the parts full of bells on the table and laughed: "I don't accept anyone else, but you Ah Fu and I am convinced, no wonder you want me to return the ore, put it in so many parts, it's really a little out of place!" ”

It is no wonder that Zhang Yulin said this, the above things are basically picked up "tattered", the small box used to fix the ore is the bottle cap, the cigarette box tin foil and sewing needles are used in the ore as two electrodes, and the antenna and wire are connected by waste wires, which can be described as a centralized recycling of waste products.

But I was originally a radio enthusiast, although these things look broken, but in the eyes of Xi and Zhang, they are all big treasures, even if they are broken, they don't feel distressed, and it doesn't take half a day to go out, and they can put on two more sets.

"Yulin, do you think Professor Cheng's method is easy to use? Consumables are cheap, but they are too cheap to feel confident. Xi Kangfu was busy with the work in his hands and wondered.

Zhang Yulin didn't think about it, and replied directly: "You can not believe me, but you can't not believe Professor Cheng, right?" Each issue of the "National" magazine published a small scientific experiment, let's follow the above steps, but it is all done. ”

Xi Kangfu tilted his head and thought for a while, and said thoughtfully: "That's right, those failures are basically because our operation is not standardized, and things are fine, but I still can't understand why the material must be cheaper. ”

"That's what you said, glass tubes are more beautiful." Zhang Yulin stopped what he was doing, and he also agreed with the question raised by Fa Xiao, but after scanning all the "rags", he instantly understood Cheng Nuo's intentions: "I think, I understand Professor Cheng's thoughts." ”

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

Zhang Yulin's tone was filled with reverence: "If I guess correctly, Professor Cheng should think that the cheaper the things, the easier it is to promote radio technology, and more friends who are not as wealthy as us can also experience the charm brought by technology." ”

Originally, Xi Kangfu still had some ideological bumps, but he looked at the worn-out wires in his hand and muttered to himself: "The National" magazine is sold so cheaply, the "Mathematical Dictionary" is half sold and half sent, and the work-study classes in France are all free...... I should have thought of it! ”

Zhang Yulin sighed, patted the small shoulder and said: "It's nothing, it's not too late to know now, when we succeed in manufacturing, we can also help Professor Cheng publicize and publicize, now we have to hurry up and thoroughly understand the technology of this ore radio, and strive to win the first battle." ”

After this little episode, the two quickened 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 pulled into a spider web, which comes to the roof through the attic windows, and raises them high in the air.

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

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

"It's twelve, right?" Xi Kangfu unconsciously swallowed a mouthful of spit.

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

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

"If we don't remember the time wrong, the first experimental broadcast will be broadcast for an hour at 12 o'clock, and the content is not yet known." For fear of missing this critical juncture, Zhang Yulin spoke quickly: "Yes, I won't be mistaken, it will definitely be at 12 o'clock, let's just wait." ”

Suddenly thinking that there was something wrong with Fa Xiaogang's words, Zhang Yulin suddenly turned around: "People don't call it "Radio", it's called "National Broadcasting", Professor Cheng said that we can't get used to imagining and experiencing a new medium with the old familiar media experience and knowledge!" ”

Xi Kangfu scratched his ears and whispered: "It's not that I call the radio myself, but everyone calls the radio, thinking of going with the crowd ......"

It's a pity that before he finished speaking, he was directly interrupted by Zhang Yulin, and his voice was very loud: "Hurry, it's going to be 12 o'clock soon, hurry up and control our ore radio and listen to the national unlimited electricity...... Phew, you've taken them all wrong, national broadcast! ”

After receiving the order, Xi Kangfu didn't care about complaining, and quickly moved the pointer to capture the signal in the air.

But after all, it was the first time for the two to use the ore radio, and they were inexperienced, coupled with the low performance ceiling of the ore radio, the pointer was dialed for more than half an hour, and there was still a noise, and they couldn't find the legendary "National Radio" at all.

Looking at the pointer on the wall moving back little by little, seeing that it was about to be one o'clock in the afternoon, and the daily experimental broadcast was about to end, in such a cold day, Zhang Yulin was so anxious that he was sweating profusely, and couldn't help urging: "Ah Fu, how is it?" ”

Xi Kangfu frowned tightly and shook his head to indicate that it had not succeeded for the time being.

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 captured until now, it's not at all logical! ”

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 not been able to receive the signal. ”

Zhang Yulin shook his head again and again: "Impossible, I can almost memorize the article, it is impossible to miss any knowledge points, it should be the same amplitude of the oscillating current acting in the open transmission circuit through electromagnetic induction, because there is a carbon particle microphone in series in the antenna circuit, when the sound wave impact ......"

Just as Zhang Yulin was pushing back the principle of the ore radio, he suddenly heard an unusual sound in his ears, and immediately stopped to introduce the principle:

"Slow down, Ah Fu, you move forward a little."

"Is that it?"

"No, a little further."

"Where's this?"

"It's over, it's a little bit back, yes, here it is, slowly, slowly......"

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

After the two glanced at each other, they couldn't hold back their excitement and continued to slowly move the pointer, and the voice in the microphone became clearer and clearer, and finally they could clearly distinguish that it was Peking Opera singing.

"I ...... We're ...... It worked? Although Xi Kangfu covered his mouth, he still couldn't hide the excitement outside his words.

"Suddenly look up and see the blue falling moonlight and clear, see the clouds and clear sky, and the ice wheels are surging ......" sang a paragraph with the squeak in the radio, Zhang Yulin hugged his hair heavily: "It's not good 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 sound of the bell began to be heard from inside.

The Peking Opera on the radio also came to an abrupt end, and then a round announcer's voice came from inside: "Hello listeners and friends, today's "National Radio" is here, welcome everyone to continue listening to the radio at the same time tomorrow!" ”

With the official recognition, Xi Kangfu directly hugged Fa Xiao: "We have succeeded, we have successfully heard the voice from afar, the hard work of these days has not been in vain, we are a good ......"

At this time, Zhang Yulin was relieved and ushered in an unprecedented sense of satisfaction, he seemed extremely calm, and tried his best to appease Fa Xiao: "Slow down, slow down, our guy hasn't cleaned up yet, if he touches the pointer off in a while, the hard work will be in vain." ”

Xi Kangfu quickly calmed down: "Yes, yes, yes, it's not easy to find this signal, you 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 said categorically: "Of course not, why can't we listen in time just now, it's because in addition to the audio current we need, there are also high-frequency currents in the circuit, and we have to find a way to filter them out......"

Just when the two were still talking about the next experimental direction, they didn't know that the crooked antenna in the attic had attracted the attention of others, and they knew that two miles away from this place was the military garrison area, which was where the Songhu Protector Army Office worked.

At present, it is the confrontation between the north and the south, and this kind of equipment is in a state of high tension, especially when you see the antenna near the garrison, it is easy to associate it in some bad directions.

On Cheng Nuo's side, he was still in the radio laboratory, busy debugging the broadcasting equipment with Tesla, and he didn't know that there were already little fans in Shanghai who had received the broadcast, and the effect was so good.

As for those articles, they are more forward-looking and like publicity, which belongs to unintentional insertion.

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

(End of chapter)