Zhou Jianhua entered the store, and when he saw that the ponytail girl behind the counter had been looking at him, he nodded at her, and then carefully browsed the various equipment in the counter and on the shelves along the counter.

There are many communication equipment in this store, and there are many kinds of communication application equipment and accessories covered, from some small power short-range radio communication equipment and accessories to various special high-power amplification components used to amplify the transmission signal, to the special accessories of the high-power transmitter used in the radio and television tower. Zhou Jianhua noticed that there are even some special accessories used in high-performance military communication equipment, and he wondered a little, how could military devices flow into the civilian market?

Zhou Jianhua looked at everything very carefully, and while he looked at it, he compared the equipment with similar functions that he had applied in his previous life, and estimated the performance of these communication equipment in front of him. Unfortunately, these equipment are simply displayed on the counter or shelf, and there is not even a product card, and most of the components do not have a formal packaging, most of them are just wrapped in transparent plastic paper to prevent dust, and there is no explanation or price.

Zhou Jianhua thought to himself, that is, a professional like himself can roughly understand, how to sell products in this way, so how can customers choose?

Zhou Jianhua started to look inside from the left-hand counter that entered the door, and when he walked to the counter in front of the ponytail girl, he had been looking at it for more than ten minutes. The ponytail girl looked up at him in surprise from time to time, and then looked down to check her information, and after several times, the girl finally couldn't help it, and asked:

"What are you looking for?"

"Oh! I don't look for anything, I just take a look. Zhou Jianhua looked up and replied with a smile, and then looked down at the equipment on the counter.

The ponytail girl frowned and stopped talking.

After a while, Zhou Jianhua browsed all kinds of devices on the counters and shelves on three sides, and felt that he had a general understanding of the varieties of equipment in the communication field on the current market, but he could not figure out the performance level of many equipment. Seeing that it was still early, he walked up to the ponytail girl, pointed to an amplifier transistor for signal amplification, and asked her to take it out and take a look.

The girl glanced up at Zhou Jianhua and asked, "Which unit are you from?" ”

Zhou Jianhua was stunned for a moment, and said in his heart I haven't said I want to buy it, are you going to invoice me? But since they asked, they might as well cooperate with her, and then go back:

"I'm from Tonglin Coal Mine in Jiancheng County."

"Did you bring a letter of introduction?" The girl asked again.

Zhou Jianhua's head was dizzy, I still have to bring a letter of introduction to buy something?!

"Comrade, I just came to purchase products, and now I just want to see them." Zhou Jianhua replied

"I'm sorry for this...... Can't show you. The girl replied lightly, and lowered her head to look through the information.

"Why?!" Zhou Jianhua is extremely depressed, no matter how awesome the product is, it has to be understood by customers to make a good choice, no matter how awesome the store is, it can't discriminate against customers so much, right? ! Take it out and take a look, I'm not here to rob!

"You can't read it without a letter of introduction – it's a rule in our unit!" The girl didn't even lift her head this time.

What a strange rule! Look at a product and have a letter of introduction!

Zhou Jianhua bit his lip and snorted helplessly, shook his head speechlessly, and was about to say something more, when a sharp sound of car brakes suddenly came from outside the store, and with the sound of "bang" slamming the car door, a person wearing an armed police uniform walked in quickly.

This armed policeman was in his thirties, burly and vigorous, he walked directly to the ponytail girl and asked in a loud voice: "Xiao Wang, how is my machine now?!" ”

"Uh...... I'll call Zhang Gong to come over......" The ponytail girl quickly stood up and pushed the door into the inner room, and soon a middle-aged man with glasses came out of it, white and thin, very gentle, but he couldn't hide the tiredness on his face.

"Hello! Director Lei! The man known as Zhang Gong shook hands with the armed police across the counter, and said with a guilty face:

"I'm sorry! That machine hasn't been adjusted yet...... It's a bit tricky! I'm sorry to delay your business! ”

"Alas......! What can I do about this?! Director Lei smacked his fist on the counter a few times with an anxious face, gritted his teeth and frowned, looking impatient.

"I've been helping you adjust this machine for the past two days, and I know that you are coming today, and I didn't close my eyes all night last night...... I've done my best......" Zhang Gong rubbed his dark eye circles with his hand and helplessly defended:

"The key is that this machine has too high requirements for the temperature stability of the components, and as soon as the temperature rises after starting, the signal parameters drift with it...... Although we have some imported devices with good temperature stability, there is no one suitable for your parameters...... I've tweaked the system several times, but it doesn't always stabilize...... There is a problem with the design of this equipment, such a portable machine, only considering simple and practical, but ignoring the performance level of domestic components, small horses and carts, some unrealistic......"

"Of course I know about it! If it weren't for that, I'd still be looking for you - we'll take care of it ourselves! Director Lei said angrily: "It is said that you Zhang Gong is the number one person in the field of communication equipment in our province, why did you plant it on such an inconspicuous small device as us?" ”

"So what now? You see...... Do you want to stay with me and try to adjust, or do you ......? Seeing Director Lei's impatient look, Zhang Gong was at a loss.

Director Lei didn't know what to do for a while, biting his lip and looking up at the ceiling, his eyes rolling around thinking of a way.

Listening to their conversation just now, Zhou Jianhua roughly understood what was going on, the signal drift was unstable, and it was nothing more than the functional circuit being affected by the changes in the voltage, current or resistance parameters of the constituent elements, but Zhou Jianhua had his own solution.

In this era, there is no accurate constant voltage, constant current, constant resistance integrated functional circuit in China, it is really difficult to rely on discrete components to achieve, but you can learn from the idea of designing integrated circuits, and use discrete components with unstable parameters to make a special constant voltage, constant current or constant resistance functional module, and use the whole module as a separate discrete component, so as to meet the needs of temperature stability. It's just that more components are used, and the equipment space will be a little larger.

Although Zhou Jianhua is only a grass farmer now, the ideal of strengthening the country and enriching the people formed in his previous life has not changed at all, and it is the time for him to display his talents to serve the country.

"I'll show you this!" Zhou Jianhua said on the side.

Zhang Gong, Director Lei, and the ponytail girl called Xiao Wang all turned their heads to look at Zhou Jianhua, and no one spoke, all wondering what this young man wanted to see? It can't be to help fix the machine, right?

Seeing that several people looked at him suspiciously but didn't speak, Zhou Jianhua knew that his existence was going to be ignored again.

It is not the first time that Zhou Jianhua has experienced this kind of cold reception, and now he has become accustomed to it - people, they always need an adaptation process - Zhou Jianhua himself exonerated the three people in front of him in his heart.

"I'll help you take a look at the machine you just talked about! Maybe I can help a little bit. Zhou Jianhua said to them clearly again.

"...... you?!" The few people in front of them were stunned, where did this come from a strange boy who didn't know the height of the sky?!

"Do you know what they're talking about? Don't talk nonsense if you don't understand the situation! The ponytail girl known as Xiao Wang stopped loudly on the side, and the originally quiet pair of beautiful eyes stared at Zhou Jianhua coldly at this time.

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