Well that's some "grade A" horseshit in those scans.
There was some confusion caused in the early days of when Zhuk prototypes were shown at Western air shows and some writers conflated them with N019 series radars. All N019 radars share the same cassegrain antennas as do the N001 variants.
Much as I like Bill Gunston's writing, he was never that reliable on Soviet stuff, and my feelings on Mr Gordon are well known.
Yes, there was confusion as to the name of the radar during early writings of the Mig-29.
I was under the impression regarding antenna was a mistake
initially, that is was in fact a lighter, digitized ECM hardened N019 mirror scan configuration. But several (cannot say
many) sources, some Polish state it was a slotted array, and any contemporary sources do not care to dive into specifics other than better performance and nothing mentioning view zones & identifiers to confirm it was same twist Cassegrain antenna type. Some source material on the Yak141 state that the radar to be used is similar to the 9-13S (smaller reflector iirc) attaches a black and white photograph of a slotted array.
These same authors do actually make a correction regarding this subject, but it's not regarding the antenna type or 9-13S, but the name of the N019 Rubin. They make a specific note correcting error in western media reporting as the Mig-29 was still new and the Cold War was ongoing. Why I began to lean more toward it was slotted, was partly because of the requirements for true tws, R-77 integration & the fact that these old authors wrote about the MiG-29 in the early days before the collapse made corrections, wrote such minute detail about the 9-13S were also armed with pictures of an old, slotted array they refer correctly by name, Topaz. Well before N010 had a serial produced version & before the MiG-29 serial modernization program ever got started. But they somehow got the antenna wrong? Possible.
Sure, examples of a slotted array (specifically for Mig-29) were seen by the West as early as the Mig-29 itself.
So, why is it
not a slotted array in the 9-13S? Genuinely asking.
These radars are smaller and easier to manufacture, if the Soviets had the capability & al the desperate reason to do so, so why not? They immediately ordered and planned as a matter of national security to upgrade every Mig-29 to the Topaz standard. The slotted array is the exact type they always wanted from day one. How else would a true tws, the ability to generate real track files be implemented effectively with no beamforming in a radar type like the N019 Cassegrain? Just a better Ts100? More digitization? I continue to find it harder to believe the more I look into it. Where I am almost at the point of coming to the conclusion that no mirror scan radar of the Soviet Union & post-soviet was capable. I understand the Su-27SM was the first to have true TWS in its N001VP/VEP & that is a mirror scan, but was it
really? only seen pictures of its master computer, not the antenna. I have not continued research on the SM though & yes, I know it's not an issue of the Cassegrain configuration itself (though it severely limits TWS capability) & there are western examples that is capable, but the particular unique configuration that is exclusive to the Soviets, I have yet to find the proof.
I asked myself and generally now, what are the reasons it was not a slotted array? They already produced the MiG-31 radar. Quite odd that an air defense interceptor (very important, yes) receives a phased array, but the fighter which served as the backbone of the entire Soviet Union's tactical fighter element could not receive some level of phase shifting in its mechanical scan? Perhaps MoD doctrinal shifts in national defense last days leading up to economic collapse? Possible & makes sense.
So, it comes down to this. We can confirm the radar was a closely guarded radar. Yes, the original N019 was compromised, The Soviet Union embarrassed allowed the trial & conviction of Adolf Tolkachev publicly known & immediately ordered a new radar for Mig-29 and upgrade of several other intercept radars & ground platform, an SA (forgot which). Very few sources as to the N019M Topaz are available to West, even in Russian, I have quite a few Russian books dedicated to the Mig-29 but have not gone through all of them. I am still reading the long two volume Su-27 books we discussed (they are very good & actually have a question about a page in it regarding engine thrust).
We can all confirm the Soviet Union
always had the capability for high end intercept radars and initially planned to equip the Su-27 & Mig-29 with, slotted, planar arrays comparable (actually better in some aspect) to the Eagle etc. day one of PFI, but as we know, they were not able in several reasons pertaining to a inability for large scale production of digital components before collapse etc. not because the Soviet Union lacked the innovation and ingenuity as many assume.
So, we know these guys dedicated (Yefim) their life to Soviet Aviation history, I do not believe there is a single man who publishes in English as experienced, dedicated & had access comparable to him. Is this not a fact?
So, I ask genuinely. Why would this be a total impossibility?
Unless I simply have not researched hard & long enough and there is widely available 9-13S pictures with Topaz exposed out there the entire time? it always being a twisted Cassegrain radar.
I have still yet to see a single picture of the N019M in Cassegrain configuration as it sits in a 9-13S and all pictures I came up on was picture of regular old the N019 Rubin. Do you have any? I do however continue to find pictures like this: got to look tomorrow.