LDM

[@antonivanov8853]

люблю твои видео. половина российских приборов, которые ты обозреваешь, производились на заводе, на котором я раньше работал

[@axyetbdajte2]

Спасибо за видео !

[@danielfearn6076]

Hi Michel. I know it's perhaps not your favourite topic but I would love a teardown of the RF feed from the antenna, looking at the feed horn design and the waveguides etc. that collect the RF signals for processing.

[@lelabodemichel5162]

I don’t have the antenna nor rf parts of this seeker.

[@cogoid]

It is exactly what you see at 0:24. There is a broad rectangular waveguide, divided in the middle by a partition. Dipole directors and a plate reflector are mounted on this partition. This is the feed. It is illuminated by the parabolic reflector. I do not know what is on the other end of the waveguide in this particular seeker, but a textbook design of such feed uses a special hydrid, with three outputs. One output gives the "sum" signal representing the overall received power, and two other outputs give the "difference" signals which indicate the angular position of the target relative to the antenna's boresight in two orthogonal planes. A good antenna textbook would explain the principles of operation of such feed in detail.

[@danielfearn6076]

@@lelabodemichel5162 Aucun problème! Merci pour votre réponse!

[@danielfearn6076]

@@cogoid I’m somewhat familiar with the arrangement of a monopulse radar. What I’m really curious about is the exact geometry of the feedborn at the top of the waveguide. In some simulations I’ve been experimenting with, the reflections of waves off of the outside of the waveguide that would otherwise cross and enter the opposite side of the feed appear as images in the radar picture. How this is overcome is what I am intrigued by.

[@Qsderto]

You put in so much effort. Do you want to make homemade air defense for self-defense? I see that this is circuit design from the Soviet mid-70s. I think modern chips are not used here since making changes will lead to too much work and new tests. It's all too expensive. It's cheaper to use old circuitry. Greetings from Moscow

[@YuriWhite2251]

Судя по вашему ответу вы ничего не понимаете в военной электронике! Дело не в том, что в данных устройствах не хотят использовать современные компоненты, а дело в надёжности и цене таких компонентов для по сути одноразового применения! Поэтому схемотехника и компоненты 70х годов и дешевле и надёжнее. Странно что такие простые вещи я вынужден объяснять.

[@Qsderto]

@@YuriWhite2251 У русскоязычных так мало добродушия.. я просто хренею . Послал бы тебя, но пожелаю вам счастья!)

[@nguyen7979]

mặc dù xem không hiểu gì nhưng vẫn thấy nó thú vị.

[@TranNhan06]

Đây là cụm servo trong bộ con quay hồi chuyển của tên lửa phòng không Buk của Nga, muốn hiểu được nó thì phải có kiến thức về điện tử và tự động hoá mới được

[@0x0NoFear0x0]

Patriot seeker might be more interresting

[@КонстантинЛетов-у6р]

Hello Michel, why do you think the PCB is coated green? I guess this board is from the latest releases of the Russian military industry. Thanks for the review.

[@cogoid]

This seeker has been in production since 1990. This specific board was manufactured in the summer of 2013, using components made predominantly in 2012. The green color comes from the "solder mask" layer coated on the board during manufacturing. The solder mask prevents solder from sticking to the areas of the board where it is not intended to, exposing only well defined solder pad areas. This prevents solder bridges, and is important especially in automated PCB assembly. The use of the solder mask was not very common in the USSR and hence Russia. You can see the older example of this exact seeker 0:24 with the boards without the green solder mask. But modern PCB manufacturing processes and equipment are easily available on the international market, and of course many factories in Russia started to use them in the 21st century.

[@alexmartynov5503]

Выглядит,как самое начало 80х

[@sonic-mine]

Ussr - genius ingenering. ❤❤❤❤❤❤