Thank you for looking at this. You have identified one of the problems I frequently run into when checking some of the databases. Frequently, there are inconsistencies in the data. I have Mladenov's book and as I write description files, I am using it as a reference for checking some of the data in the database, including the question on the High Lark radar. You are correct that he identifies High Lark 2's carrier frequency as being "I" band. However, I'm guessing that he is wrong on this, for the following reasons:
1) One of the sources I provided is quoting a US pilot who flies a Mig-23 in Florida. The article states "The MiG-23ML that we see in Florida still has its J-band radar installed. Known to NATO as High Lark 2, this operates across 10,000 to 20,000 megahertz and has a range of 53 miles, Ward says. " Because this is a first-hand source, I give it more credibility.
2) In an article on the R-23R Apex A missile SARH that is used by the Flogger G, the RGS-23 sensor is describes as operating in the J-band see "https://www.aereimilitari.org/Armamenti/R-23-Apex.htm" This is consistent with the High Lark 2 operating in the J-band. Of note, Jane's Air-Launched Weapons, "AA-7 'Apex' (R-23, R-24)" 09 November 2001 also confirms that the R-24R is a J-band missile, indicating that "High Lark 2" is a J-band radar.
3) the authors of the book that has the chart I used are aerospace engineers who worked on the F-22 project, and the book itself is a technical, vice a popular book on the subject, so presumably they had better info than Mladenov. Their CV from Amazon is as follows: Dr. David C. Aronstein is a principal aerospace engineer at ANSER in Arlington, Virginia, where he provides senior technical support to such programs as the Joint Strike Fighter and F-22 air superiority fighter. Mr. Albert C. Piccirillo is a principal aerospace engineer and a manager of the Joint Technology Division at ANSER, where he leads technical and analytical efforts on advanced weapons systems, including the Joint Strike Fighter. Michael J. Hirschberg is an aerospace engineer at ANSER, Inc. He currently supports the Propulsion Management Team for the Joint Strike Fighter Program.
Mladenov is good. As I said earlier, I use him as a source for some of the description files. But in this case I think the evidence indicates that he is incorrect on this point
You are probably right. But apart of confirmation of X band in current terminology I was not able to find clear confirmation.