♂?，，

  Radio waves are electromagnetic waves, which have two important parameters: wavelength and frequency. The wavelength and frequency are inversely proportional, so the higher the frequency, the shorter the wavelength, known as short wave; the lower the frequency, the longer the wavelength, known as long wave.

  The frequency of an electromagnetic wave is the number of cycles per second in which the magnetic or electric field changes, and its unit is Hertz, represented by the English letter Hz. In wireless communication, since the value of the frequency is generally very high, there is usually a letter before Hz, for example 5z represents five hundred million Hz of radio wave.

  Lin Hong made an effort to recall the memory fragments of that day, and finally remembered that when he was having a real-time wireless conversation with others before, the frequency displayed on the radio's display screen was around 7 GHz, while the frequency range he had just searched for channels was mostly below 6 GHz.

  This is why he couldn't find his private radio station all along.

  This time, Lin Hong made an adjustment and started searching directly from 7 GHz.

  Sure, here is the translation:

  As expected, all sorts of noise soon came from the speaker. Sometimes it was background noise that was too loud and you couldn't hear what the other person was saying at all. Other times, there were multiple voices overlapping each other, and all you could hear was a bunch of gibberish, not a single word clearly.

  But more often than not, what came out of the speakers was a "beep boop" sound similar to Morse code. Lin Hong knew that this was a type of signal called "Morse code", which used electrical pulses to represent different English letters through long and short signals. He had seen this in a magazine before, but he hadn't read about the specific details yet.

  "I knew it!"

  Lin Hong's right hand clenched into a fist and placed it on his chest, making a victory gesture. This step seemed simple, but it took him some thought, if not for his super memory, he would not have found the reason.

  After the excitement, Lin Hong began to fine-tune the channel, filtering out noise and irrelevant channels, carefully listening to those relatively clear voice signals in the air. "Hello, this is BG6KAE, feeling bored, anyone wants to chat, please contact me, over..."

  "Shhh... br6id, signal is 59, I can hear it very clearly here..."

  "This is ba3ab, requesting insertion, requesting insertion..."

  ……

  At this moment, although it was already midnight, the frequency in the air was extraordinarily lively, with countless people's calling voices filling it, making Lin Hong feel as if he had arrived at a vegetable market.

  But at this moment, Lin Hong's cerebral cortex was extremely excited. This experience made him feel very magical, as if he had discovered a new continent, a brand new world. He never thought that on a quiet night, there were so many people who chose not to sleep, but instead kept sending their voices into the sky, hoping to contact people thousands of miles away.

  Lin Hong noticed that each of them seemed to have their own specific code name, and these code names all had the same coding rule, mainly composed of letters and numbers.

  Moreover, much of what they said was only half-understood by Lin Hong, although he understood the individual words, but when connected as a whole, he had no idea what it meant, because it contained many professional terms.

  Although Lin Hong had made up for a lot of knowledge about wireless electricity, he still found that he was still a little bird who didn't understand anything here.

  After listening for a long time, and waiting until the voices in the channel gradually became fewer, he finally decided to try to make contact with the outside. "Hello... I am... I am Ah Huang, wanting to find someone to chat with..."

  Although he didn't know what CQ meant, since everyone was calling him that, he just went along with it. He didn't have his own code name and didn't want to reveal his real name, so on a whim, he borrowed Ah Huang's name instead. "CQ, I'm...I'm Ah Huang, looking for someone to chat with, is anyone there......"

  This time, I finally got a reply.

  "Shasha... Okay, I'm bg1vbb, nice to be connected with Liantong, Ah Huang... Hehe... the call sign is really interesting... Shasha..."

  A girl's voice came from the speaker, and judging by her tone, she was not very old, just like Lin Hong, belonging to the category of little kids.

  Lin Hong's spirits lifted instantly upon hearing the other party's response, and a look of surprise appeared on his face.

  In fact, due to a head injury in his childhood, he was not very clever and had poor mobility in his legs since he was young. Moreover, with his mother by his side when he was young, Lin Hong gradually developed an overly introverted personality. He was afraid of communicating with others, but deep down inside, he yearned for communication with people.

  Ever since he discovered that he could use the radio to communicate without having to face others, his heart had been unable to calm down for a long time. It was because he didn't have to worry about being looked down upon by others due to his own defects. He also wouldn't feel nervous and intimidated with others standing in front of him, and he could speak freely and uninhibitedly with them.

  But after all, he is still a child. If he communicates directly with adults, there will be some psychological barriers, just like last time. Even if contact is established with the other party, the conversation between the two parties is not on an equal footing, and this conversational experience is very bad.

  Now he's actually in contact with a girl who doesn't sound very old, which makes him overjoyed. "I'm also happy to meet you."

  "Hehe... are you using your family's radio too? How can you not even understand the basics? ... Shasha... I'll tell you, CQ is an abbreviation of "seek you" in English, it's only used when calling out to someone to greet them. Since we're already connected, we don't need to use that anymore~"

  So it was like this...

  Lin Hong's face suddenly turned red, he had just made a low-level mistake, and apologized: "Sorry, I don't understand any of this."

  "Hehe, it's okay... I used to be like that too... I'll secretly tell you, I don't actually have a amateur radio license either... The call sign I'm using now is my brother's~~ Hehe... But he's asleep now, and I'm sneaking in some time on his radio... If you think the call sign is too long, you can just call me VBB... Hehe... But if we're calling each other on the channel, it's best to use the full call sign, after all that's basic courtesy..."

  Lin Hong listened attentively to every word the other person said, and in their brief words, there was too much information. His brain quickly digested the information contained within. Although he could guess some of it from the context, he decided it would be better to ask the other person directly.

  "Nice to meet you too! I'd like to ask a few questions, is that okay?"

  "I know what you want to ask... Shasha... Go ahead, Ah Huang... Hehe..."

  Lin Hong's face turned red again, the title he had previously given himself was taken casually in a moment of urgency, but now hearing the other person call him "Ah Huang" made him feel a bit awkward.

  "What is an amateur radio license? And, isn't the call sign a code name between us? Why do everyone's call signs consist of similar letters?"

  "Hehe... I knew you'd ask that question... As soon as I heard your call sign, I knew you were a rookie... Haha... That teacher will give you a good lesson, so you won't make the same joke again in the future... Haha..."

  ……

  ===

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