Although Sheriff Black Cat only has five episodes, it is still constantly played back and forth, but this has not stopped children from loving this cartoon, besides, there are not many cartoons on TV now.

Hearing his grandson's words, Old Man Qin immediately let go of his tense face, which was full of smiles, and soon turned on the TV and pressed the remote control.

Inside the TV, there were countless snowflakes, and Old Man Qin said to himself: "No, the antenna mast outside has been blown crooked by the wind again, I'll go out for a spin." ”

In the city, there may have been closed-circuit television, but in the countryside, if you want to watch TV, you can only use an antenna, where there is a TV at home, there will be a high TV antenna shelf in the yard, fortunately the village is on this side of the hillside, just opposite the TV tower of the county seat, if it is drilled to the back of the mountain, how to adjust can not receive the TV signal.

Old man Qin went out.

The TV shelf, which is more than ten meters high, is welded with steel pipes, thick underneath and thin above, and then there is a base underneath and a bearing inside, so that it can be rotated.

For convenience, there was a handle at a height of one person, and now, Old Man Qin looked up, looked at the position of the antenna shelf above, and began to mutter: "Why is this crooked again?" ”

Then, with great force, he began to turn.

This requires the cooperation of two people, one rotates the antenna outside, and one person watches TV inside, when it turns to the right position, the picture will become clear, if it turns, the people inside will shout, and then turn it back here, it must be repeated many times, so that it can be adjusted to the best state, now, the old man Qin is moving back and forth here, and he has already turned half a circle, but there is still a snowflake inside.

"Oh no, it must be the thread on it that is broken." Old man Qin looked at the top, at this time, the cold wind was still blowing, and the connecting lines above must have been blown off!

"I'll do it." At this moment, a voice came from behind him, Li Zhiqiang, who was like a thin monkey, almost didn't dare to speak after he came, I really don't know how he won Qin Xue's favor with such a shy person, maybe, or Qin Xue took the initiative to take a fancy to it?

But now, Li Zhiqiang seems to have changed as a different person, and now, Qin Feng gradually understands that this guy is not very good at dealing with people, but if he wants to deal with machines, he will immediately become active.

At this time, Li Zhiqiang was carrying a pair of pliers in his trouser pocket, and then he swished up.

The higher you go, the thinner the pole becomes, and when you get to it, there are three wires to support it, and even then it is quite dangerous, and at this time, the northwest wind is still blowing.

Li Zhiqiang was originally wearing a cotton coat, but it was inconvenient to get on the telephone pole, so he took off his clothes and wore the red sweater inside, which was very bright, which was knitted by Qin Xue for him and given him a birthday gift.

Now, Li Zhiqiang swished up, it seems that this kid has been able to climb trees since he was a child, and he is probably a headache for adults.

When he got to the top, Li Zhiqiang simply checked it, and then, he began to use pliers to cut the wire, and the wire fell down first, and then, I saw that Li Zhiqiang began to dismantle the TV antenna shelf.

"Hey, what are you doing?" Old man Qin watched below, feeling that this future son-in-law was really strange, let him go up, it was the wiring head, not the thread removal head, what was he doing?

However, the person above did not react, as when he came, and regained his composure, and he was busy on it so quickly, when he saw the antenna rack, which he had removed from the top, had carried it behind him, and slid down with a stinging sting.

"How's it going, is it cold up there?" Qin Xue asked with concern, this is winter, the cold wind is biting, on it, only wearing a sweater, even the bones will be frozen, if Li Zhiqiang does not wear gloves, if he touches the cold TV pole directly with his hands, a layer of skin will stick.

"This kind of antenna is too inefficient, and the most suitable for receiving meter-wave signals is the Yagi antenna, which is the same as our radar." Li Zhiqiang said: "Now, I want to transform it. ”

Old man Qin's eyes widened on the side, this antenna is made of aluminum wire, on a board, branching out in all directions, becoming a fork, in the village, everyone does this TV antenna, now, this posterity, what kind of Yagi antenna?

Qin Feng also understood, he couldn't help nodding, this Li Zhiqiang is a technology-engaged man, he wants to conquer his father-in-law, relying on technology, they are engaged in radar, you know, 14 institutes are originally good at terrestrial radar, in terrestrial radar, a very important aspect is meter-wave radar, UHF band, and TV radio waves are a frequency band, now, just watch Li Zhiqiang play his skills.

The antenna of the meter-wave radar is the Yagi antenna, which is the most suitable way, and if the Yagi antenna is used for the TV, it can immediately improve the reception performance.

In technical terms, it has good directivity and higher gain than dipole antennas. It is particularly effective for direction finding and long-distance communication. And with the Yagi antenna on the TV, further design is required.

Therefore, when the antenna was taken down, he entered the house and placed it on the ground of the outhouse, Li Zhiqiang did not immediately start making this kind of antenna, but took out a pen and paper and carried out complex calculations.

He only has the aluminum wire removed from this fork to make the Yagi antenna, and to make full use of these things, this requires careful calculations.

A typical Yagi antenna should have three pairs of oscillators, and the entire structure is in the shape of a "king". The active oscillator connected with the feeder is called the reflector, which is slightly longer than the active oscillator, and it plays a role in weakening the radio wave transmitted from this direction or the radio wave emitted from this antenna on the side of the active oscillator; A direction that is slightly shorter than an active oscillator, it is located on the opposite side of the active oscillator, and it enhances the radio waves coming from or emitting from this direction.

These are exquisite, the more directives, the sharper the direction, the higher the gain, but generally not more than four or five, so, he wants to design five units of Yagi, the simplest, the most economical, three directors, a reflector and an active oscillator so that it is enough.

His calculation made Old Man Qin scratch his head, these intellectuals, it's just so troublesome, is it okay for him to do this?

Old Man Qin was a little skeptical.

Qin Feng finally relaxed, let Li Zhiqiang show his hand this time. Let Daddy know that knowledge is power, and he can watch TV more clearly!