HBWnovel Chapter 617 So what if it's rustic? Anyway, even if it's "rustic," it's sti
Chapter 617 So what if it's rustic? Anyway, even if it's "rustic," it's sti
Shouting is pointless, calling out is pointless.
EMC is now a global problem. Just look at the F-104 fighter jet, which is subject to a mandatory requirement that radar usage time be less than 10 minutes per use, with a 5-minute cooling interval.
As you can see, when the MiG-21PF uses the RP-21 radar for scanning, the RSIU-5 radio's reception range is reduced from 150km to 30km. Pilots must turn off the radar to receive tower instructions, thus losing their beyond-visual-range combat capability.
Even funnier is the "Lightning" fighter jet from Lobster Country, hahaha...
The radio altimeter they used was extremely sensitive to the pulse noise of their domestically produced AL-23 radar. In one test, the radar caused the autothrottle to misjudge the altitude and drop to zero, causing the engine to suddenly push to 110% thrust, resulting in the turbine blades melting.
For the onlookers, that firework was truly dazzling; for the driver of Lobster Country, designer, oh thank you to your ancestors for eight generations!
As for why there was no such severe interference during the Tu-4 test flight earlier.
Perhaps, maybe, uh, the Conus radar of that time wasn't very good?
That's why EMC (Electromagnetic Compatibility) technology is so important. Not only in the past, but even now, very few people can truly master it…
No, it should be said that no one but us can master this!
Didn't you see when our Type 055 was launched, a bunch of foreign big-nosed people pointed at its highly integrated radar mast and shouted "impossible"?
why?
Haha, this thing that integrates S-band (long-range search), C-band (Hongqi-9/19 missile guidance), X-band (fire control guidance), and UHF meter-wave (anti-stealth) radar into one unit not only solves the problems of electromagnetic compatibility, heat dissipation, and energy management, but also enables dynamic scheduling through a comprehensive radio frequency management system. For example, when the S-band scans a large area of airspace, the X-band can simultaneously lock onto multiple targets...
Meanwhile, the Burke-class destroyer of the same era, designed for the US Navy, planned to integrate S/X-band radar, but this has yet to be realized due to technological bottlenecks. The Europeans, with their more abstract approach, were even more outdated, employing only a single C-band radar…
Come on, tell me what it means to be far ahead, what it means to unilaterally crush someone...
Of course, while these words are encouraging, they still cannot solve the current predicament that Little Fool is facing.
then……
"Eighty, eighty, eighty..."
A bunch of people joined the little guy in swinging a sledgehammer. What were they smashing? Copper foil, of course. The required precision didn't need to be very high, 0.2mm would suffice. They would then manually wrap it around sensitive equipment, which would at least increase the shielding effectiveness.
Why not let Hongxing Machinery Factory use hydraulic free forging to produce a batch?
You could say this kid got carried away again... He worked himself to the bone, drenched in sweat, before finally remembering that if he used the factory's free forging machine, it would probably only take ten minutes or so.
So Xiao Daimao could only console himself by saying that the workload at the factory was heavy and the forging press shifts were fully booked.
However... during the forging process, Xiao Dai Mao recalled more "homemade methods" related to interference measures.
This is a true story from my roommate's interview with a top graduate student. My roommate passed everything before, but the professor asked a hypothetical question: If electromagnetic compatibility standards hadn't emerged, integrated circuits hadn't replaced discrete components, and there were no FIR filters, how would you suppress impulse noise?
This roommate failed miserably...
It's not that the expert is giving his roommate a hard time; according to the expert, this is the way we came! We can't just keep moving forward; we have to look back occasionally, and maybe we'll discover a "side road" we haven't taken before.
"Innovation in high-end equipment often stems from a thorough understanding of fundamental principles and bold restructuring!"
After being "educated," my roommate went through the materials from the 70s thoroughly and kept talking to Jiang Xia about things like improved wiring, timing isolation, and non-conductive composite materials...
Jiang Xia didn't know how to make a non-conductive composite material.
However, the improvements in wiring and the principles of electromagnetic shielding can still be used.
Change it! Make a major change!
Let's start with the radome!
At this point, Jiang Xia was really determined. He stopped using the improvement experience described by the rough-around-the-edges guy from the museum and instead used the "unit analysis method" in conjunction with the activated "scanner" to reconstruct the distribution.
The radar radome, which had been ignored, was completely opened, the support was changed to a cross beam structure, a ring of support ribs was added in the longitudinal direction, and rubber damping pads (the rubber gaskets of pressure cookers) were filled at the connection points.
Since there was no suitable material for the supporting ribs, Jiangxia used bamboo instead, which caused a disaster for a certain 600-year-old bamboo forest... The rather beautiful purple bamboo was completely swept away by Lao Wang and his men.
Inside the radar, the originally parallel radar feed lines and signal lines were forcibly twisted at an angle of ≥60° according to Jiangxia's requirements, and the magnetic compass signal lines were also completely covered by the newly hammered copper foil.
The floor inside the fuselage was also removed, and a main grounding plate made of 3mm copper was installed on the fuselage frame, with each device having its own grounding wire. To be on the safe side, Xiao Daimao, following the experience of later generations, emphasized that the length difference of the grounding wires must be less than 20cm.
Since there was no ferrite core (the one that bulges out on your monitor cable), Jiangxia also created a mechanical version of timing isolation.
It's quite simple in theory; it involves switching power priorities (radar → navigation → communication) via a cam switch. In other words, it automatically cuts off the autopilot control circuit when the radar is emitting power.
"This isn't a compromise, it's sacrificing functionality for safety!" Little Dai Mao argued vehemently.
The captain and first officer in charge of piloting the Tu-4 felt the same way. It's just that during long-haul flights, you need to pay more attention to the flight attitude and heading. It's tiring, but being able to get up in the air and catch mice quickly makes this little bit of hardship nothing!
Yes, didn't we just mention that the Tu-4 was a reverse-engineered product of the Russians' B-29 "Superfortress" bomber?
There is definitely an autopilot, but the difference is that the Russians have always been weak in the electronics of fighter jets, and this autopilot is a very crude imitation. If it weren't for the tight schedule, the Russians would definitely have replaced all the vacuum tubes inside the autopilot...
Bah! This vacuum tube not only has high power, but it also generates noise. Just wait until Dr. Lan Ying can build an LC series resonant circuit, and then I'll take it apart!
The power priority issue has been resolved, but there's still one more problem...
heat!
It's so hot!
It's so stuffy and hot!
Jiang Xia glanced at the thermometer fixed to the cabin wall. It was 60 degrees Celsius!
Hey...look, look, the thermometer has gone up another notch!
"Report to the designer! Our comrades are all fantastic! They're not bothered by the heat at all!"
"Yes! As long as we can eliminate the invading enemy, we don't care what happens..."
Jiang Xia was deeply moved by this.
After cutting off the radar's main power supply, they grabbed the researchers and operators by the ears and forced them out of the cabin.
It's only been tested for ten minutes and it's already this hot. What's the big deal?
Keep in mind that this was in the dead of winter. If it were summer, Jiangxia estimated that after the KJ-1 flew back, the operators would be reduced to dried meat – that would be the greatest disrespect for the laws of nature.
"Hey! Engineer Jiang! We really can do it, let us test it again..."
"Pah! You think I'm worried about you? Keep trying, and believe me, I'll blow up all the traveling wave tubes!"