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  As Lin Changming has now become the director of the carton factory, he spends less and less time going home, almost all day staying in the factory with those technicians studying how to improve old products and develop new ones. Lin Hong is always at the waste collection station.

  It's called a waste collection station, but in fact it's already become a mere formality. Old Xu doesn't have the heart to manage this collection station, and he's not short of money either, with his sons and grandsons showing filial piety. The reason he took over this place is just because he values this courtyard, on the other hand, it's also to let his grandson get closer to Lin Hong.

  It turned out that his decision was very correct, under the influence of Lin Hong, Sun Wu's academic performance is now in the middle and upper reaches of the class, which was unthinkable before.

  The waste collection station currently only occasionally collects some electronic and electrical waste, and basically doesn't want anything else. It's mainly Lin Hong who is collecting, and after collecting, most of it is dismantled into piles of components.

  Lin Hong finished his training and went to the Carton Factory. Seeing that Dad didn't have time to come back for dinner again, he directly ran to the Scrap Collection Station with Sun Wu and they casually got something to eat.

  Sun Wu held the portable radio Lin Hong gave him, but was worried that he didn't have any cassette tapes, so for now he could only use the radio function, however, since they were in a rural area, the reception wasn't very good.

  After being bored for half a day, he finally couldn't stand it and said, "Little Shifu, I'm going back for a while."

  His home has a lot of popular song tapes, he decided to go back and bring them all over at once, anyway, it's not far from his own home, just speed up his legs, and it can be done in two hours.

  Lin Hongtou, who was welding something on his workbench with an electric soldering iron, didn't even turn around and just grunted a "hmm".

  Sun Wu saw this and shook his head somewhat helplessly: "Hongzi, I said doing this all day is tiring, isn't it?"

  After finishing speaking, he didn't stay any longer and immediately grabbed his Walkman and ran towards home.

  Lin Hong sat quietly at the workbench, welding a small accessory in his hand. It was a small circuit board, only the size of a matchbox, but it was densely packed with components such as resistors, capacitors and chips. From the new and old degree of these components, it can be seen that they were all disassembled from different devices and then reassembled together.

  On the workbench in front of him, a light yellow draft paper was placed, on which a circuit diagram was drawn with a ballpoint pen. The lines were straight and even, and the layout of the components was reasonable. If Old Xu were here, he would find that this was a very familiar circuit, somewhat like the principle diagram of signal separation, but it had also undergone significant modifications based on the original.

  The thing in Lin Hong's hand, the size of a matchbox, is the design principle diagram of an "adaptive signal filter". This drawing was finalized by Lin Hong after spending more than a month testing and debugging. As far as he knows, there is no similar product on the market at home.

  The reason why so much thought was put into making this thing is mainly because with the development of the economy, there are more and more factories around, and the interference signals in the air are also increasing, which has a great impact on Lin Hong's amateur radio life.

  In theory, all electronic devices are constantly emitting invisible electromagnetic waves, only with varying intensities. These electromagnetic waves have little impact on ordinary people's lives but cause huge troubles for "ham" operators.

  Previously clear signals are now increasingly blurred, often with many noises mixed with useful signals, and direct listening is unclear. This puts higher demands on hams to filter out useless noise from received signals and receive true signals transmitted by other hams.

  The difficulty increase is not just a little bit, but rather a multiple of the original, which greatly tests the technical ability of the ham. However, after a long time, it often becomes dull and meaningless repetitive labor.

  Lin Hong designed an "adaptive signal filter" to improve his own receiving efficiency. By installing this device at the receiving end, it can automatically filter out ineffective noise within a specific frequency range, greatly saving the operator's time and effort.

  After soldering the last component, Lin Hong took it to the receiving end of the amateur radio station next to his workbench, pulled out a cable plug from the receiving end, and then connected the small box in between, very simply installed.

  Next to the workbench, this amateur radio was placed on a wooden frame about one meter high, with many grids in between, holding quite a few devices. In the center was a black transceiver that looked more beautiful and smaller than the one Old Xu had before. On top of it were a blue LCD display screen and several large round knobs for tuning frequency and amplitude.

  At both ends of the telegraph equipment, there are also some other strange small devices, which are basically some auxiliary tools, such as modified switching power supplies, amplifier sets, power filters, conversion switches, voice callers, and electrical keying devices for sending Morse code.

  These things filled up the entire shelf, eventually forming a very professional "amateur radio station".

  This is the essence of Lin Hong's hard work over the past three years.

  The entire wooden frame in front has a wooden board door, which is usually locked with a large cow head lock when Lin Hong is not using the radio. Except for his closest people, outsiders have no idea what's inside.

  Of course, Sun Wu definitely knew about it, but without Lin Hong's permission, he would never be able to touch these things. Although Sun Wu thought these things were very cool, they were actually too complicated to operate, and he only got fascinated for a while when Lin Hong first set up the radio station, and then completely lost interest later on.

  In Sun Wu's view, Lin Hong was a madman, guarding the radio station day and night, constantly adjusting the various knobs on it, just to have brief conversations with others. Sometimes, after connecting with each other, they would only report their callsigns and then disconnect, continuing to search for the next target to communicate with, wasn't this just having nothing better to do?

  It would be better to kill him directly than to let him stand in front of the radio for two hours, listening to that annoying noise.

  So, usually at night, Sun Wu rarely stayed here. He preferred to chat and drink with the young people in the village, go to the town's only dance hall to watch others dance, and even fight with others.

  His parents are not around, and if it weren't for Old Sun always keeping him in check, he'd probably be out of control by now and have been to the police station countless times.

  Lin Hong connected his new gadget and as soon as he turned on the power, a clear voice came from the speaker above the frame:

  "This is bg1vbb calling, standing by... over."

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