Courtesy @Bratva from PDF:
报道也确认了枭龙第三批改进型内部的若干变动,由于需要使用新型雷达(预计是中国研制的KLJ-7A有源相控阵雷达)以及新型航电,包括全新电子战系统,第三批内部有不少变化。报道指出“座舱通风管改走向”,而且难度很大,为此进行多次攻关,最终在环控、结构、强度方面多次推翻重来,最终完成了这一重大改进。
此外,报道点出了若干无线电发射设备的变动,可能与新的电子战系统有关。报道指出经过攻关,实现发射器无需凸起的鼓包天线罩。这是一大突破,因为过去无线电发射器一般要求外露在机身以外,以保证有效收发,“埋入”机身内的发射器是近年第五代战斗机的技术特征之一,有利于隐身、降低阻力和简化维护维修工作。
Google Translate:
The report also confirmed a number of changes in the third batch of improvements made to the Fierce Dragon. Due to the need to use the new radar (which is expected to be the KLJ-7A active phased array radar developed by China) and new avionics, including the new EW system, the third Lot within a lot of changes. The report pointed out that "the orientation of the cockpit ventilation pipe was changed", and it was very difficult to carry out many tackling problems in this regard. In the end, it repeatedly overthrown the control, structure and strength and finally completed this major improvement.
In addition, the report points to changes in several radio transmitting equipment that may be related to the new electronic warfare system. The report pointed out that after research, to achieve launchers without bulging radome. This is a major breakthrough. In the past, radio transmitters were generally required to be exposed outside the fuselage in order to ensure effective transceiver. The "buried" fuselage launcher is one of the technical characteristics of the fifth generation fighter in recent years, which is conducive to stealth, Reduce drag and simplify maintenance and repair work.
Source:
I can not comment upon the reliability of the source.
Thanks to @Bratva, who is a reliable and very well-informed member at PDF.