Radio waves are electromagnetic waves, which have two important parameters, namely wavelength and frequency. Wavelength and frequency are inversely proportional, so the higher the frequency, the shorter the wavelength, which is called short wave; The lower the frequency, the longer the wavelength, which is called a long wave.

The frequency of an electromagnetic wave is the number of times a magnetic or electric field changes periodically per second, and its unit is hertz, which is represented by the English letters Hz. In wireless communication, since the value of the frequency is generally very high, it is common to have a letter M in front of the HZ, for example, 5MHz stands for five megahertz of radio waves.

Lin Hong tried hard to recall the memory fragments of that day, and finally remembered that when he had a real-time wireless conversation with others before, the frequency displayed on the radio display screen was about seven megahertz, and the frequency range of the channel he had just searched for was basically lower than six megahertz.

That's why he hasn't been able to find a private radio station.

This time, Lin Hong made adjustments and directly started searching from seven megahertz.

Sure enough,There were all kinds of noisy sounds coming from the speaker soon,Sometimes the background noise is too heavy,It's not clear what the other party is saying,And sometimes,It's several voices overlapped,Only hear a big chatter,Not a word can be heard clearly。

And more often, what is broadcast on the speaker is a similar voice of "Didi Dudu". Lin Hong knew that this was a kind of signal called "Morse code", which sent a long and a short signal through an electric key, indicating different English letters. This is what Lin Hong saw in the magazine, and as for the specific details, he has not yet seen the relevant content.

"And so it was!"

Lin Hong excitedly clenched his right hand into his chest and made a gesture of victory. This step seemed simple, but it took him a lot of thought, and if it wasn't for his super good memory, he couldn't find the reason at all.

After being happy, Lin Hong began to slowly fine-tune the channel, filtering the noise and some irrelevant channels, and carefully listening to the relatively clear voice signals floating in the air.

"CQ, CQ, here is BA1DC calling CQ and waiting for answer... Rustle......"

"Rustle... cq,cq,I'm bg6kae,bored,If you want to chat, please contact,over......"

"Rustle... br6id, your signal is 59, I hear it very clearly here......"

"This is ba3ab, request insertion, request insertion......"

……

Although it was already midnight at this moment, this frequency band in the air was very lively, and the voices of countless people filled it, making Lin Hong feel that he had arrived at the vegetable market.

However, at this moment, Lin Hong's cerebral cortex was extremely excited, and this experience made him feel very magical, as if he had discovered a new continent, a new world. He never imagined that so many people chose not to fall asleep in the originally silent night, but kept sending their voices to the sky, hoping to get in touch with people thousands of miles away.

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

Moreover, Lin Hong can only understand a lot of what they say, although he understands the words he says, but he doesn't know what it means when they are connected as a whole, because it contains a lot of professional terms.

Although Lin Hong has made up a lot of knowledge about radio, he still finds that he is still a rookie who doesn't know anything here.

After listening to it again for a long time, waiting for everyone's voices in the channel to gradually fade out, he finally decided to try to contact the outside world.

He picked up the microphone, pressed the speak button, and emitted his first radio wave of the day:

"CQ, CQ, I'm... I'm Ah Huang and I'm looking for someone to talk to......"

Although he didn't know what CQ meant, since everyone called it like this, he had to do the same. He didn't have his own code name, and he didn't want to reveal his name, so he made an improvised decision and borrowed Ah Huang's name.

After stopping for about two minutes, Lin Hong still didn't receive any information from others.

Lin Hong said again:

"CQ, CQ, I'm... I'm Ah Huang, I want to talk to someone, is anyone there......"

This time, there was finally a reply.

"Rustle... Hello, I'm bg1vbb, it's a pleasure to connect with you, Ahuang... Hee-hee... Your call sign is so funny... Rustle..."

What came out of the speaker was a girl's voice, and the other party was not very old when she heard the voice, and like Lin Hong, she belonged to the category of children.

After hearing the other party's answer, Lin Hong suddenly perked up, and his face showed surprise.

In fact, due to the head injury when he was a child, his brain was not very useful when he was very young, and his legs and feet were not very flexible, coupled with his mother being by his side when he was a child, Lin Hong gradually developed a too withdrawn and introverted personality, he was afraid to communicate with others, but deep down, he was extremely eager to communicate with others.

Therefore, since the last time he found out that he could use the radio station to talk without face-to-face, his heart could not calm down for a long time, precisely because he did not have to worry about the other party looking down on him because of his own flaws. He will not feel nervous and afraid because the other party is standing in front of him, and he can talk freely with the other party without restraint.

But after all, he is still a child, if he communicates directly with adults, there are still certain obstacles in the psychological aspect, just like last time, even if he establishes contact with the other party, the dialogue between the two is not on an equal footing, and the experience of this dialogue is very bad.

Now that he had actually connected with a girl who didn't sound very old, he couldn't help but be overjoyed by this situation.

Lin Hong hurriedly replied: "CQ, CQ, I'm also very happy to meet you." ”

"Hee-hee... Do you also use your adult's radio station? Why don't you even understand the basics? … Rustling... Let me tell you, CQ is the abbreviation of Seekyou in English, and it will only be used when calling others to say hello, since we have been connected, we don't need this~"

So that's how it was...

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

"Rustle... Hee-hee, it's okay... I used to be like that... I'll tell you secretly, in fact, I don't have an amateur radio license, and the call sign I use now is my brother's~~ hehe... But he's asleep now, and I'm stealing his radio...... If you think this call sign is too long, you can just call me vbb... Rustling... But if you're calling me on a channel, it's best to use the full call sign, after all, that's the most basic etiquette... Rustle......"

Lin Hong listened carefully to every word the other party said, but the other party's short few words contained too much information, and his brain was quickly digesting the information contained in it. Although he could guess part of it through the context of the other party, he decided that it would be better to ask the other party clearly.

"Hello vbb, really nice to meet you. I want to ask you a few questions, I don't know if it's okay? ”

"I know what you're trying to ask... Rustling... Say it, Ah Huang... Hee-hee..."

Lin Hong's face turned red again, the title he gave himself before was taken casually in a hurry, but now he felt a little awkward when he heard the other party call himself "Ah Huang".

"What is an amateur radio license? Also, the call sign you said is the code name between us, right? Why is everyone's call sign composed of such similar letters? ”

"Hee-hee... Just know you're going to ask this question... As soon as I heard your call sign, I knew you were a rookie... Rustle... The teacher will teach you a good lesson, so that you don't have to make such jokes in the future... Rustle..."

……

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