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OK, here's another problem
The forward bulkhead on Blk 3 has a square hole. But KLJ-7A has a rounded antenna.
However LKF601E does have a square antenna.
So what's happening here?View attachment 777510
let’s not make everything a mystery 
It's not a mystery. It's obvious.nothing is happening give it a rest
Chao
OK, here's another problem
The forward bulkhead on Blk 3 has a square hole. But KLJ-7A has a rounded antenna.
However LKF601E does have a square antenna.
So what's happening here?View attachment 777510
OK, here's another problem
The forward bulkhead on Blk 3 has a square hole. But KLJ-7A has a rounded antenna.
However LKF601E does have a square antenna.
So what's happening here?View attachment 777510
Or just testing it?
May be Both used, may be block three will fly with two aesa , one with klj 7 a and other with 601 e,OK, here's another problem
The forward bulkhead on Blk 3 has a square hole. But KLJ-7A has a rounded antenna.
However LKF601E does have a square antenna.
So what's happening here?View attachment 777510
There is a air cooled KLJ-7A variant we havn't seen. Could be a hybrid of KLJ-7A/LKF601E. PAF would want fleet commonality so makes sense to have different variant of the same radar that doesnt need additional cooling and could fit existing aircraft in service.
quwa.org
OK, here's another problem
The forward bulkhead on Blk 3 has a square hole. But KLJ-7A has a rounded antenna.
However LKF601E does have a square antenna.
So what's happening here?View attachment 777510
Post# 9459 already answered your question.OK, here's another problem
The forward bulkhead on Blk 3 has a square hole. But KLJ-7A has a rounded antenna.
However LKF601E does have a square antenna.
So what's happening here?View attachment 777510
If air-cooled version of KLJ-7A AESA radar is selected for JF-17 Blk 3s then these plumbings seen outside the bottom of the cockpit are coming from the engine compressor. High pressure air is being used as coolant.There is a air cooled KLJ-7A variant we havn't seen. Could be a hybrid of KLJ-7A/LKF601E. PAF would want fleet commonality so makes sense to have different variant of the same radar that doesnt need additional cooling and could fit existing aircraft in service.
Pakistan Selects KLJ-7A AESA Radar for JF-17 Block-III
The Pakistan Air Force (PAF) selected the NRIET KLJ-7A active electronically scanned array (AESA) radar for its forthcoming multi-role combat aircraft, the JF-17 Block-III.
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Though the KLJ-7A was available in multiple versions, one with a fixed-array, another with a mechanically steered panel, and a form with side-mounted panels.[2] However, Warnes’ noted that the PAF opted for an air-cooled version of the KLJ-7A, potentially indicating the existence of a fourth variant.[3]
In 2016, NRIET reportedly said that the KLJ-7A offers a maximum range of 170 km against a target with a radar cross-section (RCS) of 5m2.[4] NRIET added that the KLJ-7A uses over 1,000 transmit/receive modules (TRM), and is capable of tracking 15 targets and simultaneously engaging four.[5] It also has over 11 modes for operation, including synthetic aperture radar (SAR).[6]
It is unclear how the air-cooled configuration would impact the KLJ-7A’s performance, but the competing LKF601E (also air-cooled) offered near-identical results. So, like the KLJ-7A, the LKF601E offers a range of 170 km for ‘fighter-sized’ targets, with the ability to track 15 of them simultaneously, and engage four at once.[7] However, LETRI did not disclose how many TRMs it is using in the LKF601E.[8]
Thus, an air-cooled variant of the KLJ-7A should at least be as capable of the LKF601E. However, compared to the liquid-cooled version of the KLJ-7A, the air-cooled variant could be lighter in weight, and smaller in size. The benefit of this choice could be that it would be easier to retrofit to earlier JF-17 models.
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