Old Xu Tou looked at the wooden box in his hand with a surprised expression.

At first, he didn't notice it, he just thought that this wooden box was antique, but when he opened the lid, he found that it was a radio, and when he saw the structure inside, he was even more surprised that it was an ore radio.

Lin Changming saw that Old Xu Tou looked surprised and puzzled, so he asked:

"Old Xu, isn't this your thing? My kid has always insisted that he did it himself, don't you think it's? If he could make a radio, then the radio factory would not have to go out of business? ”

"It's not mine." Old Xu Tou shook his head at him, and then said earnestly, "Changming, your temper has really changed. Although Xiaohong doesn't seem to like to talk, he has a very smart brain. You care too little about your children, and as a father, you are so careless that you don't know your son at all......"

Hearing Lao Xutou's words, Lin Changming nodded frequently, a teachable look. Thinking about it carefully, Xu Lao said it well, he really cares too little about his son, and there is no woman in the family to maintain it. Children from other families are regarded as the pearl of their palms by their parents at this age, and they are afraid of tiring their children by doing something, and some trivial things in their own family have to rely on their sons of a few years old to do, thinking of this, he can't help but feel a little embarrassed.

At the same time, his heart was shocked, he never expected that Xu Lao valued his son so much.

"Could it be that this radio was really made by Xiaohong himself?"

Lin Changming looked at his innocent son, his heart was very complicated, shocked, regretful, happy, and relieved......

"Lin Hong, let's go, let's go to the room and see how your mining machine performs."

Lao Xu was interested for a while, he had asked Lin Hong many times before how the production process of Lin Hong's mining machine was, but the other party was vaguely fooled, and he kept shirking that it was not finished and was improving, but he didn't expect that the other party had already treated the "ore machine" as a work of art.

Old Xu Tou cautiously held the ore radio in his hand and walked towards his room, with some expectations in his heart. In his heart, he has always looked at Lin Hong differently, and always feels that this child has spirituality. Looking at the works he made now, they do look good. And just now he also glanced at a few times, this ore machine is very thoughtful in many aspects of the design, such as the knife switch and the design of the headphone interface, which is simply classic, safety and convenience are taken into account.

Lao Sun Tou also followed behind him with a smug face, and muttered in a low voice: "Hehe, Lao Tzu has long known that this kid is a ghost." Or will they take him as an apprentice? ”

When he said this, his face was not red and his heart was not beating, and he did not feel that he was incompetent as a master. You must know that since he taught Lin Hong's three-body pose last time, he has never taught Lin Hong anything else, and once in a while, he only slightly pointed out the key points of the three-body pose.

Old Xu Tou put the wooden box on his workbench, and then began to take out the external watch to test some important parameters in this ore radio.

To measure the quality of a stone machine, first of all, the Q value of the variable capacitor and coil is an important parameter to measure the inductor product, the higher the Q value, the smaller the loss, and the higher the efficiency. Secondly, there are the forward voltage drop and sensitivity of the geophone, the headset and the antenna parameters.

Lao Xu put on reading glasses, measured with a multimeter for a long time, and finally sat upright, muttering to himself.

The old grandson heard his old friend constantly talking about things like "Wonderful ideas... Cleverly designed... Unbelievable...".

So, he pursed his lips and interjected, "Isn't it just a broken radio, as for it?" ”

Old Xu Tou glanced at him a little speechlessly, and finally spoke: "Although the ore radio is simple, it is very difficult to really do it well. The parameters of this radio have simply reached the limit of an ore radio. ”

It doesn't matter if others don't understand, but Lao Xu Tou knows it very well in his heart. Making an ore radio is basically an introductory course for electronics students, and he spent a lot of effort to study this, and the final radio is far inferior to this one in terms of parameter performance.

Old Xu Tou didn't think that Lin Hong did it according to the tutorial, because he had basically read all the books and magazines here, and none of them recorded such a method of making an ore machine.

When he was studying in the Soviet Union, he also participated in such a competition, when experts from China and the Soviet Union worked hard to make dozens of various ore machines, and the ore machine of Lao Xu Tou won the third place, but compared with this one, whether it is in appearance, component layout, and key parameters, it is too inferior.

Thinking of this, Lao Xu turned his head and asked Lin Hong: "How is the listening effect?" ”

"General." Lin Hong replied.

Old Xu Tou couldn't help but feel a little strange when he heard this, it stands to reason that the performance of this ore machine will not be bad.

"Where's your antenna? What is the antenna? ”

Lin Changming hurriedly said: "There is a book hanging on the tree in the yard, which is strangely shaped, like a fish bone." ”

Old Xu Tou ignored him, but looked at Lin Hong.

Lin Hong replied truthfully: "I improved it on the basis of the Yagi antenna, but the listening effect is still not very ideal, and I can only receive seven or eight radio stations." ”

Lao Xu Tou didn't care so much, he directly connected the radar antenna he designed to the ore machine, and then turned on the switch button of the radio.

Ten minutes later, Lao Xu Tou was completely speechless.

"Such an effect, you still say average?"

He received an unknown number of radio stations, large and small, and even received one in the southern cities of the USSR.

This is completely beyond the scope of the ore radio, the ordinary ore radio, it is already very good to be able to accept one or two strong stations, and the radio stations that have just received it are already more than ten, although it has a lot to do with Lao Xu Tou's antenna, but this is not the fundamental reason.

Lin Hong even said that the performance was just "average", and Lao Xu Tou could only be attributed to the fact that newborn calves are not afraid of tigers.

Lin Hong didn't know what kind of situation the ore machine was in the hands of other people, he just came completely according to his own ideas, he thought that he couldn't listen to which shortwave radio stations, so he felt that the effect was just average. All along, he has been an old Xu Tou's radio station as the standard to demand himself.

It's a perfect ore radio!

Old Xu Tou was holding a wooden box in his hand, but his eyes were looking at Lin Hong, and his eyes showed a strange look. He thought in his heart, Lin Hong, this kid is simply an uncarved piece of jade, only ** years old, without any guidance from anyone, he can make such a work just by self-study, and then ......

"Hehe, Lao Xu, my apprentice is good, right?" Seeing this, the old grandson was even more proud, and immediately showed off, the apprentice was smart, and the master also followed.

Old Xu Tou couldn't help but be stunned: "When did he become your apprentice?" ”

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