Due to geography, every place in the world has its own local time, and as long as the scope of activities is limited to the same time zone, there is no need to care about this at all. But radio activity is cosmopolitan, and assuming that they are connected to each other, each using their own local time, can cause great confusion, as was confirmed in the early days of the rise of radio.

Subsequently, in order to solve this problem, the International Radio Advisory Committee prescribed and recommended a harmonized time standard, Coordinated Universal Time, or UTC for short, also commonly referred to as the International Harmonized Time.

It divides the world into 24 time zones, with 180 degrees each of the Earth's east and west longitudes (360 degrees in total) divided equally by 24 time zones, each accounting for 15 degrees. For example, San Francisco, USA, is located in the West 8th District, 8 hours behind the zero time zone. The capital is located in the 8th East District, 8 hours ahead of the zero time zone.

According to the International Telecommunication Union (ITU), UTC should be used in international radiocommunications, unless otherwise indicated, and should be denoted by a 4-digit number. Liaison between amateur stations is worldwide, so UTC should also be used.

Therefore, cqww_dx tournament CW start time, refers to the last weekend of November every year in the UTC sense, considering the identity of amateur radio amateurs, the organizers of the contest deliberately arranged the time from 0:00 a.m. on Saturday to 24:00 on Sunday, a total of 24 hours, to get the certificate, at least 12 hours to compete.

It's Friday, and there's only a week left until the start of the cqww_dx Championship.

After school, on the way home, Lin Hong said to Sun Wu: "After you finish practicing, don't rush out, help me do something." ”

"What did you say?" Sun Wu, who was listening to the song, took off the headphones from his ears.

Lin Hong had to repeat it again.

"No problem!" After Sun Wu nodded, he stuffed the earphones back in.

After a while, Sun Wu remembered another thing, pulled out the headphones again, and said:

"By the way, my cousin said that someone sent a color TV from the shop, he has never repaired it, and he is a little unsure, let me ask you, can you do it."

"I'll go back and see, there happened to be something going on in the past two days."

Color television is still a relatively rare product in rural areas. In the past, in order to make a black and white TV look a little colorful, many people put a colored plastic film on the front of the black and white TV.

Sun Wu's cousin Sun Kai, belongs to the kind of person with a more flexible brain, before opening a maintenance shop, he knew very little about electronic maintenance, but later through self-study, he quickly mastered quite professional knowledge. In the past, when there was a little problem, Lin Hong might have to be invited to come out, but now this situation is becoming less and less, and it is often when he encounters some uncommon products that he will say hello to Sun Wu.

Recently, his income has dropped sharply, and Sun Wu is already thinking about doing something else to make money.

Back at the scrap yard, the two of them first stood in the three-body pose, and then began to play routines, and Sun Wu also begged his grandfather to teach them a set of exercises for the two of them, and they fought back and forth, adding a lot of fun.

Lin Hong kept in mind the "four wears" and "four tips" practice methods given to him by the master, every movement, not only the action was in place, but also the eyes and expressions were meticulous, shouting when it should be shouted, staring when it should be staring, and paying full attention every time.

Sun Wu didn't agree with this at first, and made fun of him from time to time, but Lin Hong ignored him at all. Later, because of this incident, he was severely reprimanded by his grandfather, and then he relented. Over time, he also realized some of the mysteries, and in the process of fighting with others several times, he applied several of them, and found that the effect was very good

Different from ordinary exercises, they practice Xingyiquan but the more they practice, the more energetic, although a little sweat, but they are not panting and heartbeat, most of the essence of the whole body is closed in the body, rarely leaked.

"What did you say you wanted me to help with today?" After practicing, Sun Wu was not in a hurry to leave, he was still thinking about what Lin Hong had said to him today, after all, it was rare for Lin Hong to take the initiative to ask him to help with things.

"I'm going to make an antenna." With that, Lin Hong walked towards the room.

Sun Wu followed him and came to the workbench, and between that time Lin Hong pulled out a drawing from the innermost place.

Sun Wu stretched out his head to take a look, and saw that there was a sketch with a few pencil strokes on it, a few circuit schematic diagrams, and a section diagram that seemed to be something, but he couldn't understand it at all.

"I can't understand this thing, just tell me how to do it." Sun Wu said very shamefully.

Lin Hong didn't expect him to understand, he simply explained: "I'm going to make a long-line antenna ......"

Before he could finish speaking, Sun Wu interrupted and asked, "What is a long-wire antenna?" ”

Lin Hong thought for a while, but couldn't explain it, and finally said: "To put it simply, it's an antenna with a very long wire connected to it. ”

Sun Wu nodded: "Oh...... You continue. ”

"Let's connect the bamboo poles in the room first, bind the wires to the bamboo poles, and then you climb to the tree on the other side of the window, help me fix the poles, I have to do some adjustments......" Lin Hong pointed to a few bamboo poles in the room, and roughly explained what he was going to do.

Long-wire antennas are very simple, as the name suggests, to be long. Generally speaking, it is best to have a length greater than one wavelength or even multiple wavelengths, cqww_dx the competition is divided into six bands, with wavelengths of 160 meters, 80 meters, 40 meters, 20 meters, 15 meters, and 10 meters. For best results, the length of the antenna should be 160 meters or greater.

However, for Lin Hong, this is just imaginable, he didn't have such a long wire at all, and it took a long time to get a metal wire of more than ten meters, but it can also be used improvised, but the reception efficiency is relatively low, but fortunately, the communication mode he intends to participate in is CW, and its impact has been minimized.

Long-wire antennas can be placed parallel to the ground or vertically.

If it is placed in parallel, it has a strong directionality, just like the Yagi antenna, so it is necessary to constantly adjust the direction in order to get better results. However, due to the conditions not permitting, Lin Hong did not adopt this plan, but decided to adopt an upright way, so that he did not have to occupy space, and could directly lean on the trunk of the old locust tree outside the window.

Lin Hong prepared a 9-meter-long plastic copper wire and cut it into 3 sections, each of which was 3 meters.

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