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An AVIC official says the airflow for cooling the radar comes from the aircraft’s environmental control system. This apparently obviates the need for drag-inducing ducting around the aircraft’s nose. (Keep it simple, stupid)I doubt air circulation being done in radome as there are no inlets. With air cooled in case of JF-17 we are probably getting a more efficient radar with less cooling needs, the heat exchange system itself is probably not changed.
Blk-3 radar was chosen couple of months if not just a year ago, that means it was designed to accept (power/cooling) any of the radar options KLJ-7A (non aircooled)/ Grifo-E and have spare cooling for future radars.
" The transceiver modules (TRM) of an AESA radar generate considerable heat that must be dissipated for the TRMs to function reliably (and not incur damage). This is currently done through liquid cooling, which necessitates additional space for the cooling system and additional electrical power. In contrast, the LETRI AESA radar draws from the cooling methods of current pulse-Doppler radars, which implies that this AESA radar can be fit to small aircraft with relative ease and at low-cost.AVIC pitches air-cooled AESA radar for JF-17
The Aviation Industry Corporation of China’s (AVIC) 607 research institute announced that it completed the development of an air-cooled AESA radarquwa.org
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The LETRI radar could potentially be a simpler affordable avenue for upgrading serving Block-I and Block-II. In fact, AVIC appears to be banking on that reality to secure orders – losing the Block-III to bid to NRIET or Leonardo would not preclude it from selling radars to the PAF. The PAF’s JF-17 Block-I/IIs would benefit from the benefits of an AESA radar without necessitating significant structural changes. "
The radar operates in the X band and weighs 145kg. It can detect a fighter-sized target at 170km. It can track 15 targets simultaneously and engage four at the same time. It also has a surface search function. AVIC claims that it has a “strong anti-jamming capability.”
Source: https://www.flightglobal.com/video-china-intent-on-aesa-radar-upgrades/130211.article
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