Duan Yun had obviously thought of a new way to make money.

Nowadays, the TV is definitely a luxury for most families, but as the income increases, the number of TV users will obviously increase.

Generally speaking, the newly bought TV is not easy to have problems within a year or two, and Duan Yun will definitely not receive many orders for TV repair.

However, because these TVs still use their own rod antennas,So the ability to receive signals is definitely not high,Many users can only accept a central one,This can not but be said to be a kind of helplessness。

If Duan Yun can make an outdoor antenna with high receiving sensitivity, he can undoubtedly solve this problem, and the antenna business is definitely a very profitable business.

In fact, by the mid-to-late 80s, the popularity of outdoor television in the world was astonishing, and in many urban and rural residential areas, you could see the TV antennas on the roofs like bamboo forests, and the scene was impressive.

In addition, in Duan Yun's childhood memories of his previous life, the black-and-white TV at home also has a TV antenna made of angle iron and aluminum wire, and whenever the TV signal is not good, Duan Yun will open the window and turn the mast.

At that time, what made Duan Yun remember deeply was that the antenna of their house only stood in the middle of the courtyard dam by the kitchen, and the signal was not clear in other places.

In addition, a windy day became Duan Yun's most feared day at that time, because of a wind, he had to blow the antenna, and he had to find the TV signal again.

The first thing Duan Yun did when he got up after a windy day was to turn on the TV, watch the TV picture with his mother, and turn the antenna in the yard to find a signal.

"Okay. When she heard that she didn't want money, the middle-aged woman agreed very happily and said, "My family and I are both on the morning shift this month, and we are at home at night, so you can just come over." ”

"Thank you, Auntie!" Duan Yun suddenly looked happy when he heard this, and thanked him repeatedly.

Duan Yun doesn't have a TV at hand now, and the reason why he is willing to give his home for free is that he wants to use his TV for a test.

In addition, this living area is the richest group of people in the factory, and this old lady will show off when she gets a benefit, which is undoubtedly helping Duan Yun to do publicity, so no matter what, Duan Yun will not lose.

Then, Duan Yun packed up the tools he brought, said hello, and left the house.

Walking on the road, Duan Yun was still quite excited, not because of the fifteen yuan he had just earned.

If Duan Yun's reputation for electrical repair is spread in the factory, it will be very difficult for latecomers to steal his business.

The business of installing antennas is even more so,Now the factory and the entire Daxing TV have begun to popularize the trend in the future,If Duan Yun can make some fame at this time,Then you can definitely make a lot of money!

As for how many 'peers' will come out to compete or copy his antenna, Duan Yun is actually not too worried.

No matter how strong his body is, it is impossible for him to eat all the cakes alone, and with Duan Yun's electronic technology, others are destined to become only 'green leaves' that set off his technology.

In Duan Yun's memory of his previous life, in the eighties and nineties, most of the antennas used by people came from hardware stores in urban and rural areas, and some units also had 'capable people' who could make TV antennas.

However, the technical content of these antennas is not high, and they are all made of imitation of the 'Yagi antenna' transmitted from the south.

The Yagi antenna is an end-firing antenna composed of an active oscillator (usually a folding oscillator), a passive reflector, and several passive directors arranged in parallel.

In the 20s of the twentieth century, this antenna was invented by two people, Yagi Shuji and Uda Taiho of RB Tohoku University, and it is called "Yagi Uda Antenna", or "Yagi Antenna" for short.

This antenna has good directivity and has higher gain than dipole antennas. It is particularly effective for direction finding and long-distance communication. Combined with elevation and azimuth rotation controls, it is possible to communicate with stations in all directions, including spacecraft, at will, which is not possible from an upright antenna.

In addition, in the early 80s, an outdoor antenna called 'fishbone antenna' was very popular in the south.

Fishbone antenna is an antenna that receives UHF band TV signals, because its shape is a bit like a fishbone, so it is also called a fishbone antenna, in fact, the fishbone antenna is the common name of the high-gain Yagi antenna.

Since satellite television and cable television were not yet popularized at that time, in order to receive more TV channels, many places in the south, especially in the Pearl River Delta area of Guangzhou, could use fishbone antennas to receive the 'Jade' and 'Pearl' stations that talked about Hong Kong...... The living Hong Kong was suddenly pulled into front of us. The colorful programs have made people set up "fishbone antennas" in the sky above the front and back of the house.

In 1980, "Yangcheng Evening News" published an article "Hong Kong Television" and Others", describing Hong Kong TV as a "cancer of the soul" and advocating the removal of "fishbone antennas".

Theorists have debated endlessly about the pros and cons of Hong Kong television. At that time, there were many "fishbone antennas" in urban and rural areas of Guangdong, and in order to deal with the "invasion" of Hong Kong television, many places sent fire trucks to work at high altitude and forcibly dismantle the "fishbone antennas".

It wasn't until 1992 that the programs of the four channels of Hong Kong's two TVB stations were incorporated into the newly established GD Province and Guangzhou Television Network, and the local cable television stations used technical means to "filter" politically sensitive content. Since then, the "fishbone antenna" has slowly disappeared.

It can be seen that this antenna is an excellent product that can affect an era, but at present, it is still difficult to find it in northern cities in China.

This is undoubtedly a huge business opportunity for Duan Yun!

Duan Yun had been exposed to this kind of antenna when he started to study electronics in college in his early years, and at that time, under the guidance of the lecturer, Duan Yun and his classmates also optimized and improved this antenna, and the sensitivity has been greatly improved.

The only thing that worries Duan Yun is that some of the electronic components he used to improve this antenna at that time may not be available on the market now, and if he can't buy them, then Duan Yun can only use existing parts to redesign and improve.

After returning home, Duan Yun first had dinner with his mother and sister, then found a bench to sit on the edge of his bed, and used a pencil to sketch on his sister's used homework book......