Li Weidong has worked as a temporary worker in the chemical materials sales department for three years, and he can find the materials he needs with his eyes closed.
In just five minutes, Li Weidong walked out carrying a bamboo basket full of materials.
At this time, Hu Guangliang and the others had already paid and were sitting at the small table against the wall of the store.
In addition to the three people, there were also four or five young people who looked like college students gathered there.
Although Li Weidong didn't know their names, he knew that they were all radio enthusiasts.
Making ore machines is a very niche and very popular hobby, just like playing racing cars and participating in the Haitian Feast in later generations.
Likewise, there is a need for communication between enthusiasts.
The side room of the chemical materials sales department has several tables and tea, making it the best place for communication.
Those young people knew what Hu Guangliang was thinking and came up with suggestions one after another.
"Materials, materials are very important when making an ore machine. Lao Hu, don't save money."
"I heard that my buddy from the Ordnance Institute said that the q value of the 222 air variable capacitor produced by military aircraft can reach 15,000. If you build one, you will definitely be able to receive two more radio stations."
"That is, the materials in the chemical materials sales department are all from Datong. It is better to go to the laboratory of the Ordnance Institute."
...
The person who said this was a young man wearing a general's uniform.
Li Weidong also knows him, but doesn't know his name.
All I know is that everyone calls him Lao Bai.
He was dressed like a general all day long, wearing a small military cap, made of cowhide.
If in the past, Li Weidong would have just smiled lightly when he heard this.
If you don't mess around in the sales department, he can save some effort.
Not today.
...
"Lao Bai, the performance of air variable capacitors is not necessarily better than the performance of small sealed variable capacitors."
This unreasonable statement reverberated in everyone's ears like a thunderbolt.
They all turned around and saw a young man holding a bamboo basket standing there quietly. Although the young man was wearing a shabby cotton-padded jacket, he had an air of heroism that was hard to conceal.
The first person to react was Hu Guangliang.
He stood up, with a happy face, walked over and gave Li Weidong a punch: "Weidong, you were wearing a torn cotton-padded jacket today, I didn't recognize it just now.
Where have you been these days? I haven't seen you since I came here several times. I thought you didn't work in the sales department anymore."
They are all young people and like to have fun.
Every time he makes a mining machine, Li Weidong is always watching.
Over time, I can be considered half a radio amateur.
Although he has no practical experience and his theoretical knowledge is weak, his familiarity with various materials far exceeds that of these enthusiasts.
In the past, Hu Guangliang asked Li Weidong to choose the materials he needed.
"It's true that I quit. Don't I miss my brothers?" Li Weidong grinned.
The two of them chatted for a while, but the general next to them became unhappy.
"Weidong, everyone who plays with mining machines knows that the quality and performance of different variable capacitors are different. A small sealed variable capacitor has worse performance than an air variable capacitor. This is due to their production
Determined by principle.”
Hu Guangliang also said: "It's not that I don't give you face today, but what you said has violated scientific principles. If in the past, I would just use these materials, but if it doesn't work today, I will return them."
Li Weidong stumbled and stopped in front of Hu Guangliang: "Practice brings true knowledge, how about we test it?"
This proposal immediately gained support from everyone.
"This is a good idea. We often use capacitors, but we have never tested their q value."
"Weidong is an honest man. Although his educational level is not high, he knows more about ore machines than I do."
"That is, which q value is higher? You will know after testing it."
...
"Okay, let's test it." Hu Guangliang nodded.
He also wanted to know how high the q value of a small sealed variable capacitor could be.
"You guys wait, I'll get the testing tools."
Li Weidong put the bamboo basket on the table, turned around and walked towards Niu Dahong.
"Sister Niu, this is what happened..."
After listening to Li Weidong's narration, Niu Dahong, who was knitting a sweater, frowned.
"I don't understand the stuff you're talking about. What tools are needed to test it? I'll make an order for you. Don't let these guys return the goods. Otherwise, it will be troublesome to reconcile with the finance department at the end of the month."
"Don't worry, as long as I'm here, not only can they not return the goods, they have to buy again." Li Weidong took the order and entered the warehouse.
Five minutes later, he walked out holding a fist-sized copper coil, a frequency measuring instrument and several patent leather copper wires.
Hu Guangliang has already placed the variable capacitor on the table.
Li Weidong walked to the table and looked at everyone: "I connected the coil in parallel with the variable capacitor as an LC circuit to detect the q value of the coil. Since the coil here serves as a fixed value, the q value will also change when measured in parallel with different immutable capacitors.
, and indirectly determines the performance of the variable capacitor."
"Does anyone have any objections to this method?"
Hu Guangliang nodded: "No!"
Lao Bai nodded: "No!"
Everyone nodded: "No!"
Li Weidong quickly connected the coil and finally connected it to the frequency measuring instrument.
At the moment of connection, the dark blue screen of the frequency meter lights up.
The row of numbers that appeared above made everyone take a breath.
"23000!"
"Oh my God, look, there are actually 23,000, which is much higher than the air company of military aircraft."
"Impossible, absolutely impossible, this is unscientific!" Lao Bai looked in disbelief, suddenly raised his head and looked at Li Weidong.
"Did you do anything?"
Is this something you can’t afford to lose?
Li Weidong frowned and was about to speak when he was stopped by Hu Guangliang.
"Old Bai, you don't know who Weidong is, so how could he be causing trouble? Besides, whether or not this variable capacitor will be sold today, what does it have to do with Weidong?"
Lao Bai was speechless.
But he is a master who will not give up until he reaches the Yellow River.
I picked up the frequency meter and tested it again. Looking at the dazzling 23000 on it, I had to accept the result.
"Brother Weidong, tell me why this thing is unscientific?"
Everyone gathered around. It was incredible that the performance of an old-fashioned variable capacitor could exceed that of the latest air variable capacitor.
Li Weidong smiled lightly and picked up the capacitor: "You are all college students. You have studied physics and often do experiments. You should know that there is a phenomenon in physics called error.
In principle, the performance of air variable capacitors is better than that of sealed variable capacitors.
but.
The cleaning conditions when making the variable capacitor, the size of the internal spacing of the capacitor, and the degree of oxidation can all cause large differences between the produced capacitor and the imagined capacitor.
Air capacitors are new products, and the technology is generally not as mature as older products."
After speaking, Li Weidong looked around at everyone: "So, this is very scientific." This chapter has been completed!
