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Raytheon sanoo, että APG-81 "over one thousand".
Se on good old GaAs. Vain EW-kikottimet on GaN.
http://saab.com/region/india/about-.../gripen-es-electronic-wizardry-is-the-future/
http://aviationweek.com/defense/saab-says-it-ready-produce-gan-radar-sensor
"Saab says it is ready for volume production of a fighter radar using gallium-nitride (GaN) technology in an active, electronically scanned array (AESA)."
Jos/kun tuo toteutuu, otan sen pilkun pois.
Siinä vaiheessa kun saat ottaa pilkun pois, GaN on löytänyt tiensä muihinkin aesa tutkiin.
Ei kai se keneltäkään pois ole jos tutkien ominaisuudet paranevat? Jos tämä GaN teknologian leviäminen tapahtuu ajoissa HX-ehdokkaiden keskuudessa, Ilmavoimat ovat se, joka hyötyy kehityksestä. Oma suu ennen kontin suuta.
Btw pikkuisen kyllä taitaa olla nuo luvut vanhoja, 81:ssä yli 1600 moduulia. 77 jossain 2000 moduulin kieppeillä
Edit kuvassa siis AN/APG-81, F-35:n tutka
Modulien määrä ei ilmeisesti ole suoraan noiden 'piikkien' määrä, modulit ovat niiden takana.
Tutkan tehoa ei voi määrättömästi nostaa ylikuumenemisen vuoksi joten moduulien määrä*moduulin teho ei voi laskea käytännön maksimitehoja.
Joissain tietyissä koneissa on (kylmäkoneella jäähdytetty) nestejäähdytys jäähdyttämässä myös tutkaa, just sayin...
Modulien määrä ei ilmeisesti ole suoraan noiden 'piikkien' määrä, modulit ovat niiden takana. Tutkan tehoa ei voi määrättömästi nostaa ylikuumenemisen vuoksi joten moduulien määrä*moduulin teho ei voi laskea käytännön maksimitehoja.
f16.netistä poimittu hävittäjien nokkakartioiden läpimittoja:
Actually... the diameters are
F-20/T-50 => ~500mm (APG-67 family)
F-15 => ~950mm (APG-63, APG-70 families)
F-16 => ~660mm (APG-66, APG-68, APG-80 families)
F-18 => ~700mm (APG-65, APG-73, APG-79 families)
F-35 => ~700mm (APG-81)
F-22 => ~900mm (APG-77)
Gripen => ~500mm (PS/05 family)
M2000 => ~500mm (RDM, RDI, RDY families)
Rafale => ~600mm (RBE family)
Typhoon => ~700mm (ECR-90/CAPTOR family)
MIG-29 => ~624 mm (N019, N010 families)
SU-27/30 => ~1000 mm (N001, N010 [924mm antenna ver], N011 faimilies)
MIG-31 => ~1400mm (N007 family)
In general, the radar aperture (antenna area) doubles with a 1.41 times increase in diameter. With all else being constant it takes an increase in aperture of 10x to double the range of a radar. Technologies like AESA antennas increase the output and sensitivity of a radar for any given size. Advanced T/R module technology and smaller T/R modules also do that. PESAs generally reduce sensitivity. Both types of ESAs allow instantaneous beam steering and high beam focus. Only the AESA can form multiple beams simultaneously.
Kyllä, esimerkiksi F-22:ssa. Jos ulkoista jäähdytystä tarvitaan jo 20 vuotta vanhassa tutkassa niin se kertonee siitä ettei tehoja voi määrättömästi nostaa.
Tai voi kertoa myös siitä että taitaa olla vieläkin tehokkain hävittäjäkäytössä oleva aesa-tutka. Niinkuin sanottu, melkein 2000 moduulia. Tutkaa on myös välillä päivitetty, nykyinen versio kulkee nimellä AN/APG-77v1
Pointti on lähinnä se että tuo tutka on toteutettu moduleilla joiden maksimitehot on paljon pienemmät mihin nykyään pystytään, tulevaisuudesta puhumattakaan. Silti se tarvitsi polttoainejäähdytyksen jo alusta alkaen. Kertoo mielestäni vähän siitä ettei lämpökuormaa per moduli voi hirveästi enää nostaa.
Saabin katse kohdistettu Afrikkaan. Botswanassa, Namibiassa ja Keniassa nähdään potentiaalia
http://www.di.se/artiklar/2015/6/16/saab-ser-potential-i-afrika/
BDF abandons P3bn fighter jet deal
By BUSINESS WEEKLY STAFF WRITER -
September 9, 2015
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A South African Gripen (Pic:Stefan Kalm, Saab)
• Government ‘broke’
• Tender couldn’t reach the “ right people”
The Botswana Defence Force is set to abandon its multi-billion Pula project to replenish its Air Wing fleet. However there are contradictory statements coming from the defence circles, some blame the collapse of the ill-fated fighter jet deal on the fact that the deal seemed destined to fall into a consortium without the right connections. However the official line is that Government is belt-tightening as economic conditions look bleak for the foreseeable future.
Two years ago the BDF set out to replace its current fleet of fighter jets, a project that defence experts put at between P2bn and P5bn making it the biggest single project in the history of the force. A race ensued between the major airplane suppliers and their local representatives, particularly Swedish suppliers SAAB with their Gripen E Fighter and the South Korean T-50. The position of front-runner in the deal has changed hands between the two and in recent times, another supplier said to have connections to powerful figures within government.
Gripen – expensive but frontrunner
Gripen at US$68 million was reportedly cheaper than the T-50 since better at performance, stronger and a more versatile trainer, especially to provide a more seamless transition in the progression from advanced jet training to basic combat maneuver training to advanced combat maneuver training. The fact that South Africa used the Gripen, encouraged experts. In what many experts said was an indication of its commitment to the Botswana market Saab South Africa set up an office in Gaborone, two years ago, and confirmed that Botswana was a potential buyer of its war machines.
The Koreans first frontrunners
However at the same time senior members of the defence sector continued their fact-finding mission. The same year then Minister of Defence, Justice and Security, Ramadeluka Seretse accompanied by the Commander, Botswana Defence Force, Lieutenant General Gaolathe Galebotswe to attended the Seoul International Aerospace and Defence Exhibition (Seoul Adex 2013) in Korea at the invitation of the Chairman of the Joint Chiefs of Staff Seoul where sources have alluded that a deal to purchase fighter jets was made.
The other major limiting factor to the Koreans, more specifically the KAI, was that they did not have closer connections in Government Enclave.
At the time the Korean Aerospace Industries, the Korean military manufacturer of the T-50 fighter jet said they were confident of clinching the deal. KAI President and Chief Executive Ha Sung-yong, told a press conference, in 2013, in North Korea, quoted by the country’s daily publication saying they were expecting the Botswana deal to go through.
The other major limiting factor to the Koreans, more specifically the KAI, was that they did not have closer connections in Government Enclave, let alone the highest office in the land.
But the Korean project was not without its supporters within the defence preferring a clean break from the second-hand fighters that the BDF has been accustomed to. They thought a fresh platform would offer a brighter future to the Air Wing. The problem for the Korean project was the price. Some experts argue that the idea of using the T-50 would be very unsustainable considering its US$25m cost per single jet, for a mere trainer. With a purchasing budget that constantly rose from P574m in 2010-2011 to P627m last year, sources say the BDF was deeply wedged in an impasse over which jet to settle for with regard to its actual purchase cost, its maintenance costs and performance.
The Brazilian deal
Then came the Brazilians. Three years ago at the time the BDF was beginning to toy with the idea of a new fleet, BDF experts went on a fact finding mission to Brazil to witness the Latin American country’s F-5s. The Brazilians were advertising their upgraded F-5s which they were willing to sell to the BDF, through a government to government program. Nobody knows what happened to that deal, although it remained the cheapest of the three deals being touted. Insiders say the main undoing of the Brazilian deal was that there was no middlemen, and thus no-one to fight for it in an industry known for achieving its deals through the work of middle men motivated by personal gain through an elaborate system of commissions.
While the mysterious Israeli seemed to have the deal done, some BDF insiders put the spanner in the works.
Enter the Brit and his ‘shady characters’ with connections
Sometime last year a Brit of Israeli origin (name known to this publication) brought the idea of refurbished F-5s, through another intermediary within defence circles. The man, said to be connected to some shady army suppliers with links to the highest office in the land thought the deal, while more expensive than the Brazilian one, would still have the inside lane given the connections to Government Enclave.
In the contract that the ‘connected’ company has on the table, an Israeli company would offer refurbishment and in some cases procurement of refurbished F-5 jets. Insiders believed the Israeli company had an advantage not just because of the level of its connections, but also because it was promising to retain the current platform that the BDF has, the F-5 and hence limit costs in both infrastructure and pilot training. The new F-5 program would upgrade the current platform to F-5E by refurbishing the current F-5s that the BDF operates. The deal is said be around P600m compared to the more than P5billion that the T-50 deal was projected to cost. The BDF operates 14 of F-5s, F-5A fighter jets and F-5D trainers it bought from Canada in 1996.
While the mysterious Israeli seemed to have the deal done, some BDF insiders put the spanner in the works. The deal stayed comatose for the last half year, until recently when Government informed BDF they could not proceed with any deal, given budgetary constraints.
Kertonee jotakin koneesta... Gripen on se savimajapommituksiin suunniteltu kone, ei F-35.
Ei vaan, on aika mielenkiintoiset tavoitemarkkinat. Botswanassa ei kyllä tilanne näytä kovin hyvältä, ovat luopuneet ostoaikeista:
http://www.businessweekly.co.bw/bdf-abandons-p3bn-fighter-jet-deal/
Kenia on myös F-5 operaattori. Ehkä se on potentiaalinen markkina. Namibia taas näyttäisi kaluston perusteella nojautuvan Kiinaan, mahtaako siellä on menekkiä Gripenille?