StealthFlanker
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Continues from my post on page http://defenceforumindia.com/forum/threads/know-your-rafale.32861/page-236
, you only need massive antenna if you want your beam to still be directional when you transmit low-frequency wave , this is important for radar because they need the resolution cell to be small , a jammer most of the time doesnt care about the size of their beam ( of course the wider the beam , the weaker the energy concentration would be , but as explained earlier , RCS reduction is directly proportional to jamming power required , so compare to a loaded Rafale , and F-35 would only need 0.01% the jamming power to get the same effect
Secondly , you would be surprised how wide the band width of certain kind of antenna are : for example horn antenna and log-periodic dipole array have extremely wide frequency operating range
If kinematic ( speed - altitude ) was the main concern then why even bothered with the slow Rafale ? why not use F-15C instead ? why not Mig-25 ? why not Mig-31 ?
Secondly , most of the time , you cant see the nozzle or the fumes from front aspect , what you see is the aircraft body , in which case , the temperature is proportional to speed , going faster will generate more heat and you will be detected sooner , especially if you gonna fly supersonic , the heat generated will be enoumous
And what exactly make your link a "real study"? what make you think the LM pattern is not" real "?
Do you seriously think as long as the studies have the words CNT ( carbon nato tube ) , then the RAM are exactly the same ? and what make you think Russia and china dont use that kind of RAM for their new J-20 and PAK-FA ????
you can deceive fanboy like BON FAN but not someone like me with that cheap trick
the maximum thickness of the CNT is merely 250 micron
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Take for example , in similar condition the F-16 can barely sustained 4.5G
So basically you need a bunch of AWACs , ground VHF radar , various aircraft working together , just so that the Rafale can level the playing field with the F-35 , but some how the F-35 is a lesser aircraft ? , and why somehow the Rafale side is the only side that allowed to use tactic ? what if F-35 also linked with a sam battery and the only thing it has to do is transmit location of the enemy back to the SAM command center ? , what if the F-35 loft a bunch of JSM , JSOW-ER at your VHF radar ?. The problem was that Americans claimed (chamchas too) that stealth was magical and these off-board data fusions completely leveled the field and forced the once 'untouchable' assets to fight the fight as equals (in case of F-22). In case of a lesser aircraft like F-35 the Americans ended up doing a favour for the rest of the world. Choice of F-35 falls in the same bracket as Kumbhkaran asking for the boon that he ended up asking for. Some people can also term it as a strategic miss-calculation. But characterization apart it is already a fact (prarabdh karm) and soon to be unavoidable sanchit karma. I repeat I don't mind it.
Firstly you dont need massive antenna to transmit low frequency wave , the antenna in your phone can transmit GPS signal which are extremely low frequency- This has nothing to do with fairness in a French vs. Americans fight. MALD-J cannot because the aperture will never support the expectations you put on it. Its like asking Jaya Bhadhuri to speak like Amitabh Bachchan or a Pomeranian to bark like a bigger dog. The X band and Ka band apertures are much much more precision engineering but very very limited in applications while VHF has been around since ages. The L-Bands and S-Bands are are somewhere in between. But they all simply require different antenna types.
, you only need massive antenna if you want your beam to still be directional when you transmit low-frequency wave , this is important for radar because they need the resolution cell to be small , a jammer most of the time doesnt care about the size of their beam ( of course the wider the beam , the weaker the energy concentration would be , but as explained earlier , RCS reduction is directly proportional to jamming power required , so compare to a loaded Rafale , and F-35 would only need 0.01% the jamming power to get the same effect
Secondly , you would be surprised how wide the band width of certain kind of antenna are : for example horn antenna and log-periodic dipole array have extremely wide frequency operating range
Spectra has the benefit of not trying to go long range and power input needs are very big reason why radars end up big while long range jamming works out small. Very short range jamming will end up in smaller formfactors
You deeply mistaken how jamming work , jamming at shorter distance to radar is not easier , the closer you get to the radar , the harder it would be to jam it , since the reflection get stronger exponentially
In theory , Rafale have load of location for transmitter , in reality , very small surface of it is actually used for transmitter ,it only has a few small antenna on the vertical tail , at the intake and on the wing edge but not actually more than the surface area of MALD-JSpectra also has the benefit of the whole fuselage of Rafale being available to it (compared to restricted body of MALD-J) and they can put any number and type of antenna arrays to get the job done.
If that was the case they would have stopped with ITAD and MALD , no need for MALD-JIn fact MALD-J is the tactical admission that VHF are too good against F-35. The size of MALD-J with length of just under 3 meters, indicates that these MALD-J are expected to give a big return in the 1.7 to 2 meter wavelength which are said to be popular with Russian VHF Radar designers.
the question is , can your SAM EO sensor detect and track F-35 before it detect and target and attack you with a bunch of JSM and JSOW-ER ?And the expectation is true from a STAND-IN jammer which is atuned to look very much like the main F-35. But this is a small hump to cross. All the VHF radar needs to do is to cross check against IRST database already made available by Rafale/PAKFA. The MALD-J simply cannot have the EO/IR signature of an F-35. The problem actually does not even arise in the first place. Because both IRST and Radars work in lock steps.
The MBTFs were designed accordingly to be very low compared to gound based radars, so they could maximise the main requirement of effective hunting. But the main task of hunting requires the hunter to be fit and fast
If kinematic ( speed - altitude ) was the main concern then why even bothered with the slow Rafale ? why not use F-15C instead ? why not Mig-25 ? why not Mig-31 ?
it is a multi role fighter , just like every single fighter now a day(which F-35 is not, considering the fact it is a Strike aircraft being palmed off as a Fighter aircraft)
As explained earlier , thrust is not proportional to infrared signatureAnd why are you focussed ondBsM. How would you like it if the aircraft you are on (developed after spending huge monies) has low radar return but has big IR signature. What would you say to the gods - hey bhagwan please mujh ko hamesha badalon sey dhak kar rakh na taki mera IR return kabhi bhi dikhe na. Is that kind of persistent cloud cover even possible in real life.
Secondly , most of the time , you cant see the nozzle or the fumes from front aspect , what you see is the aircraft body , in which case , the temperature is proportional to speed , going faster will generate more heat and you will be detected sooner , especially if you gonna fly supersonic , the heat generated will be enoumous
There is nothing stop F-35 from throwing a bunch of SPEAR , SDB or JSM at these radar( receiver node ) , once you put a dedicated datalink and EO system on them they are not gonna be cheap , and they can be seen on satellite as well , you would need thousands them , in fact even more for a big country like Russia- Agreed or alternatively you could station completely inexpensive VHF arrays right at the borders linked by Ka-Band datalinks or Fiber optics and still enjoy the same range as the higher powered pulses. Also the accuracy can be improved as shown earlier.
There are always gives and takes but if the relay gets established for reasonable costs, then I don't think I as a defender will have to worry.
REPRESENTATIVE VHF ARRAYS FOR RECEIVING POSTS
http://www.ausairpower.net/PLA/YLC-4-Search-Radar-1S.jpg
http://www.ausairpower.net/PLA/JY-27-Radar-3S.jpg
Would you feel confident that an antenna like this is even worth the throwing an SDB or HARM or JDAM at and also may be endangering the F-35 itself.
Linking up these disparate sets is not a problem for Putin so long as he is within his own country or his Near Abroad. Secure, low latency, high bandwidth networks to interlink exceedingly large number of these apertures are not difficult to make.
so what are you trying to prove here by posting a study about EM shielding ( basically measuring absorption of CNT at frequency from 8 Ghz to 12 Ghz )???Re. "Here is a RAM pattern from LM https://www.google.com/patents/US20100271253#v=onepage&q&f=false"
- Here is a real study of these materials which is basically readily available to everybody including Russians, French, Chinese and Indians - http://www.ijirset.com/upload/2013/december/46_Review.pdf. And most of these countries are not even harping on these things. Only people like Gen. Mike Hostage and some of the F-35 fans in third world countries would even take note of these things.
And what exactly make your link a "real study"? what make you think the LM pattern is not" real "?
Do you seriously think as long as the studies have the words CNT ( carbon nato tube ) , then the RAM are exactly the same ? and what make you think Russia and china dont use that kind of RAM for their new J-20 and PAK-FA ????
Nice try , but they say CNT loading , aka the percentage of CNT in the RAM , not weight- To quote a few relevant sections from the Patent Document:
So the difference between the upper and lower bounds of the loadings (by weights) is 60000:1. Should the F-35 try to be stealthy to everything from Ka band seekers to OTH radars from all aspect then it must be ready to get 60% higher in empty weight compared to an LCA type CFC skin (what that does to fuel weights, payload sacrifice, engine weights and plumes can be guessed
you can deceive fanboy like BON FAN but not someone like me with that cheap trick
the maximum thickness of the CNT is merely 250 micron
Moreover the material was supposed to have absorbing characteristic between 0.1-60 Ghz , but for F-35 application then obviously absorbtion from 0.5 to 12 Ghz is more than enoughFor radar absorbing applications, the CNTs can vary in length from between about 5 to about 250 microns.
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Nice try , some amateur will obviously look at that and say OMG , the F-35 can only sustained 4-5 G what a pig , but people actually know anything about aerodynamic will pay attention to the altitude and speed of that sustained G valueNow how much difficult it is to push through the air an F-35 that is merely 11% over the stock version (F-35B) or 20% over (for F-35C). To understand that please refer the following:
Take for example , in similar condition the F-16 can barely sustained 4.5G
No , MALD-J is that size because it come from MALD , and MALD was designed to have that size because it needed to fit the same 14 inch slug as the MK-82Further consider the need for Stand-In jamming by MALD-J. The MALD-J is made in that form factor because it is expected to stand in for the F-35 and give almost the same signature even in the VHF band.
And who to decide that these materials are mean to shielding and RAM is only for spin off ? what if it opposite ? and what make you think the structure of the carbon nano tube in 2 studies is exactly the same ? not to mentioned these other materials included in the RAM , remember it called a (CNT)-infused fiber material disposed in at least a portion of a matrix material, not just CNT aloneFurther still its not like these materials, actually meant for shielding and not directly for RCS reduction (which is a spinoff), are not already actually used in the F-35. These have been talked about since ages which is why despite prodding by
what make you think the RAM F-35 is using now not already have similar characteristics ?( or what make you think it isnt already on F-35 ? , after all ,that pattern is from LM )Also since these materials weighing upto 20% by weight have been used already so there really is very little room for putting these shielding materials on F-35 going forward.
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