India Radar, Sensors and Electronic Warfare Archive

Nilgiri

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Gessler

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@Gessler any idea where they are getting these updates from?



No, I thought he thanked someone in the original post, maybe edited it out later?

Either way, it seems legit. It does seem like we got some novel stuff up our sleeve for designing improvements to the electrical generators we plan to hook up to the modernized/indigenized AL31FPs.
 

kakaliam2

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@Gessler any idea where they are getting these updates from?


Well he corrected himself later. Its 2400 TRMs.
 

Gessler

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Hmm...a cylindrical antenna array. What could this be for?

1742197770190.png


1742197788955.png


1742197813552.png
 

Nilgiri

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Hmm...a cylindrical antenna array. What could this be for?

View attachment 74125

View attachment 74126

View attachment 74127

Low directionality bias, generally I have seen these configurations for weather, marine (and also space I think).... since targets of interest can vector in from anywhere, and you dont get bleed effects from planar polygon (keeping power output and frequency band same) that affects beam steering, width, polarisation etc (that need computation power to correct and address for planar).

Planar makes power density and circuitry more efficient. So there is a tradeoff at play till those things get miniaturised more, so I guess it depends on the final application needs and optimisation from the current sweetspot enjoyed by planar versus sweetspot enjoyed by spherical.

Cylindrical is somewhat halfway between planar polygon and pure spherical, so its got its mix of pros and cons in between the two.
 

Nilgiri

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Low directionality bias, generally I have seen these configurations for weather, marine (and also space I think).... since targets of interest can vector in from anywhere, and you dont get bleed effects from planar polygon (keeping power output and frequency band same) that affects beam steering, width, polarisation etc (that need computation power to correct and address for planar).

Planar makes power density and circuitry more efficient. So there is a tradeoff at play till those things get miniaturised more, so I guess it depends on the final application needs and optimisation from the current sweetspot enjoyed by planar versus sweetspot enjoyed by spherical.

Cylindrical is somewhat halfway between planar polygon and pure spherical, so its got its mix of pros and cons in between the two.

I had this in my archive:


Quick search just now:

 

kakaliam2

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@Nilgiri @Gessler Do you think GaAs MMIC are actually fabricated in India from Wafer level? Afterall if there was any there would be announcement right? GAETEC in Hyderabad is a Laboratory but not on level of Industrial or Production ready level to supply to Indian Industry for Radar Applications. I believe whether its Astra Microwave or Data Patterns they import the GaAs MMIC from other countries right? Afterall that's what we have been callling as Indigenous. I think they made the foundational aspects right otherwise this wouldn't get released in PIB. The "actual" stuff of making wafers and MMIC, not importing them and claims of beating F-22 or F-35.


Although above is lab-scale success, we have to actually invest billions if we are to run a Fabrication plant. But I believe its more about tactics, suddenly GaN MMIC are available to import from South Korea it seems I read news somewhere, which were earlier restricted. Due to demonstration of Indigenous capability, now foreign countries are open to export. It has happened millions of times when we achieved or on verge of achieving local capability. What do you think?
 

kakaliam2

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@Nilgiri @Gessler Do you think GaAs MMIC are actually fabricated in India from Wafer level? Afterall if there was any there would be announcement right? GAETEC in Hyderabad is a Laboratory but not on level of Industrial or Production ready level to supply to Indian Industry for Radar Applications. I believe whether its Astra Microwave or Data Patterns they import the GaAs MMIC from other countries right? Afterall that's what we have been callling as Indigenous. I think they made the foundational aspects right otherwise this wouldn't get released in PIB. The "actual" stuff of making wafers and MMIC, not importing them and claims of beating F-22 or F-35.


Although above is lab-scale success, we have to actually invest billions if we are to run a Fabrication plant. But I believe its more about tactics, suddenly GaN MMIC are available to import from South Korea it seems I read news somewhere, which were earlier restricted. Due to demonstration of Indigenous capability, now foreign countries are open to export. It has happened millions of times when we achieved or on verge of achieving local capability. What do you think?
US DoD has BAE fab with 140nm for GaAs, the workhorse for GaN is 180nm and they are targeting 90nm process. I don't know about others because this is what I got when i searched around. For GAETEC, I think they have been doing GaAs 500nm process node. Now I don't know what process node the above accomplishment is.
 

Nilgiri

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@Nilgiri @Gessler Do you think GaAs MMIC are actually fabricated in India from Wafer level? Afterall if there was any there would be announcement right? GAETEC in Hyderabad is a Laboratory but not on level of Industrial or Production ready level to supply to Indian Industry for Radar Applications. I believe whether its Astra Microwave or Data Patterns they import the GaAs MMIC from other countries right? Afterall that's what we have been callling as Indigenous. I think they made the foundational aspects right otherwise this wouldn't get released in PIB. The "actual" stuff of making wafers and MMIC, not importing them and claims of beating F-22 or F-35.


Although above is lab-scale success, we have to actually invest billions if we are to run a Fabrication plant. But I believe its more about tactics, suddenly GaN MMIC are available to import from South Korea it seems I read news somewhere, which were earlier restricted. Due to demonstration of Indigenous capability, now foreign countries are open to export. It has happened millions of times when we achieved or on verge of achieving local capability. What do you think?

It is outside of what I know.

Lot of the issue is what is considered "indigenous" . At some point there is IP acquisition, capital machinery acquisition, transfer of tech from cooperating countries institutes and so on. These may also be licensed rather than acquired per se....it would all be in fineprint.

If something is secured sufficiently supply wise and enough of the total value (there is a lot past components regd their design, optimisation, assembly, testing etc into the full mature system) of production is done inside India, generally they give it the "indigenous" tag I have noticed. But what are the exact coefficients in various specific components between inhouse/outhouse origin (where one stops and the other begins), I dont know.
 
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