Cai Zhongming went up to the second floor, checked the door numbers of the offices on both sides along the corridor in order, and saw that the "Director's Office" stopped, raised his hand and knocked loudly on the door a few times.

I heard a voice from inside, "Please come in!" Cai Zhongming twisted the door and paced in.

The spacious office has large windows and whitewashed walls, which is very bright. There is a large desk, a wooden chair, a three-person wooden sofa, a coffee table, and two information cabinets in the room, and the layout is simple and elegant.

There were two middle-aged people, one fat and one thin, sitting on the wooden sofa, and it was Cai Zhongming who came in, and the thin one stood up first to greet Cai Zhongming:

"Oh! Secretary Cai is here! Hard work! I'm also bothering you to come all the way here! ”

"Hehe, it's not hard, shouldn't I have to go for a trip? What's more, even you, Minister Gu, are not idle! Cai Zhongming replied politely.

"This is the director of the TV station, do you know?" Minister Gu introduced Cai Zhongming to the fat middle-aged man next to him.

"Oh! Director Zhang! Hello hello hello! Cai Zhongming stretched out his hand to shake hands with Director Zhang and said politely: "Hehe...... I've never been in before, but today I came to visit and learn! ”

"Where is it, Secretary Cai, you are polite!" Director Zhang also said politely: "Secretary Cai is welcome to come over and guide the work at any time in the future." ”

"Director Zhang is polite!" Cai Zhongming said amusedly: "I'm just a hillbilly, how dare I go to your city to guide the work!" ”

"Hehe, Secretary Cai is really joking!" Zhang Taichang smiled with a smile on his face.

"Na! This is the person you want - Zhou Jianhua! Cai Zhongming turned around and put his hand around Zhou Jianhua's shoulder, pushed Zhou Jianhua forward and introduced him to the two leaders:

"Man, I brought it to you! If it doesn't work, I can't guarantee it! We're driving ducks to the shelves, and we're getting axes! But the county asked him by name, and it was not good not to come......"

"Hello two leaders!" Zhou Jianhua smiled and nodded at the two of them and said hello.

"Xiao Zhou is really young! If it weren't for County Magistrate Zhou's special emphasis on his age in advance, I would never have believed it! Minister Gu nodded approvingly and said to Cai Zhongming:

"Alright! Now that you're here, let's take a look! Hehe...... We're all burning eyebrows now! ”

Four people rushed out of the director's office and went up to the computer room on the third floor.

There are two sets of transmitter equipment in the computer room, which are used to broadcast the programs of Jiangnan Provincial Television Station and Provincial Chengnan Metropolitan Television Station respectively, and two people in their twenties and thirties who look like technicians are bending down to carefully check the circuit of one of the machines, and when they see four people walking in, they all straighten up and look at them.

Zhou Jianhua glanced at the equipment in the computer room, except for these two sets of transmitters, there was only a video player, and there was no other related equipment for image editing and production.

Zhou Jianhua thought about it and was relieved, in this era, a TV station in a small county like this is not capable of producing TV programs, whether it is capital equipment or editing skills, this kind of TV station in a small county town does not have this condition at present. They either broadcast programs in the province or some pirated videos, and they don't even do local news.

"Is there any progress?" Director Zhang stepped forward and asked the two.

Both of them frowned, pursed their lips, shook their heads silently, and did not speak.

"This Xiao Zhou master is here, let him take a look first!" Director Zhang said again.

Both of them nodded silently, stepped out of the way, and stared at Zhou Jianhua's face in surprise.

Zhou Jianhua glanced at the two of them, and said in his heart that wherever his brother went, he would attract a surprised gaze, and there was really no way to ...... Age represents qualifications and experience, and playing high-tech tricks at your own age is really suspected of pretending to be a pig and eating a tiger.

The fault was a 10 kilowatt color TV transmitter, Zhou Jianhua stepped forward, took a cursory look at the layout of the components of the electrical cabinet of the transmitter, and asked these two people: "What is the problem?" ”

"Signal clutter is severe!" The young man who was a little older and wore a faux leather jacket that was more fashionable at the moment replied.

"Bring me an oscilloscope!" Zhou Jianhua said.

Another young man hurriedly brought the oscilloscope on the workbench next to him, and took a power strip to connect the power to the oscilloscope.

Zhou Jianhua asked them about the output signal frequency of the transmitter, then adjusted the measurement parameters of the oscilloscope, connected it to the output signal end of the transmitter exciter, and carefully observed the signal displayed in the oscilloscope.

After a few minutes, Zhou Jianhua asked again: "Have you tested it - is the tube amplifier at the end of the exciter broken?" ”

"It's not bad! We had also considered what might be a problem with this tube, but we switched to a new spare tube amp and it turned out to be the same......"

The young man in the faux leather jacket replied:

"So...... We now suspect that it is most likely an issue with the input signal...... Maybe our machine is not broken, but there is a problem with the signal source - it is likely that the input video signal is too weak and the modulation system is insufficient. ”

"This ...... Unlikely! ”

Zhou Jianhua carefully looked at the signal graphics displayed on the oscilloscope and said, "Since you think it is a problem of input signal, why don't you try it with a different input signal?" Don't you know the result of the Tao after you try it? ”

"Change the signal? Where to change the signal? We only have one source of microwave signals! The young man in the leatherette jacket said dissatisfiedly: "If there was another comparison signal, the results would have been measured a long time ago!" ”

"Oh!" Zhou Jianhua patted his head, and couldn't help laughing at himself in his heart.

Television stations need to have two signal sources at the same time, which is the industry norm many years later, and it is still the early 80s, how can these broadcast stations spend so much money to prepare a different way of signal sources for the sake of that kind of excellence?

"Alright! Even if there is no backup source, I can be sure that this is not the source of the signal you are talking about. Zhou Jianhua explained:

"If the signal source causes the input video signal to be weak and the modulation system is insufficient, the signal-to-noise ratio index displayed on the oscilloscope will decrease due to the decrease of signal voltage, and the clutter it appears at this time should be relatively fine, and the presentation should be less flake-like clutter, and it will also be accompanied by the phenomenon of dim image and insufficient contrast; However, the image we are seeing now shows that the CLR indicator decreases due to the increase in clutter level, and the clutter it represents is a large particle clutter, so I am sure that the problem this time is not the problem of the signal source, but the problem caused by the thermal noise of the transistors inside the circuit channel. ”

Zhou Jianhua adjusted one of the knobs of the transmitter again, pointed at the oscilloscope with his finger, and said to the young man in the leatherette jacket again: "Look, I adjusted the tuning system of the transmitter, and the clutter interference still exists, from which it can also be determined that it is a circuit failure." ”

"Oh......" The young man nodded, as if he understood.

Zhou Jianhua also used an oscilloscope to measure from the output end to the front end section by section, and explained to the young people while measuring and demonstrating:

"You see, there was clutter interference when testing at the output of the differential gain corrector, but there was no clutter interference when measured at the output of the differential phase correction, indicating that the fault occurred in the mid-band channel...... This residual sideband filter output has clutter interference, but the image modulator output signal has no clutter interference, which can be determined to be a residual sideband filter fault...... We then connect the base of this pre-amplifier to AC ground, and use an oscilloscope to measure the noise of its collector...... You see! The noise at the blanking level is about the same as the amplitude of the sync signal, indicating that there is something wrong with this pre-amplifier! ”

The two young people have been carefully watching Zhou Jianhua's demonstration and listening to Zhou Jianhua's explanation, which is reasonable, well-organized, logical, and meticulous.

Zhou Jianhua stood up straight and patted the dust on his cuffs with a smile: "Go ahead!" Replace this magnification tube......"

The young man, who hadn't spoken much, heard Zhou Jianhua say this, and immediately ran to the accessories room in the middle to find the transistor.

"Master Zhou, you are amazing! When we participated in the training in the province, the teacher of the transmitter manufacturer was not as good as your analysis! The young man in the faux leather jacket couldn't help but admire at this time.

"Hehe, that's because he hasn't encountered such a simple problem......" Zhou Jianhua said modestly.

"Simple?! The exciter is the most critical and complex equipment of the transmitter, and you have analyzed it from the back-end to the front-end one by one, and it is simple?! The young man exclaimed with great admiration.

"Hehe, Xiao Li! It seems that you have to study hard with Master Xiao Zhou! Zhang Taichang, who was on the side, stepped forward with a happy face at this time and said.

"Secretary Cai, Master Xiao Zhou is really skilled!" Minister Gu also exclaimed loudly on the side: "It's only been a few minutes since he found the problem!"

"Hehehe......" Cai Zhongming also laughed happily, and said proudly: "Why else do I always treat Xiao Zhou as our Tonglin's baby......

At this time, the young man suddenly ran out of the accessories room in a hurry and said loudly in a panic: "Director Zhang, it's trouble!" We don't have a magnifying transistor for this model! ”

It's not easy to write a book, ask for a recommendation ticket!

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