I was curious as to how Kenwood's "Advanced Intercept Point" works so I did some googling around and found this interesting article.  It's a detailed instruction on how to decrease intermod on a TM-733, but there's lots of interesting theory here.  Below is a link to the article and a short summary.
73, Ken -N5SWR

http://www.ka7oei.com/733_rcvmod.html
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The '733 has a "feature" that has become pretty common on mobile rigs these days.  Kenwood calls it "AIP" (tm) which stands for "Advanced Intercept Point"
(tm).  All this does is to decrease the gain of the first RF stage of the receiver - reducing the total amount of signal energy that the mixer section
gets hit with, therefore reducing the susceptibility to intermod as well.  As it turns out, the AIP reduces the gain of the '733 by about 7dB on VHF and
just under 6 dB on UHF - theoretically reducing the susceptibility to intermod by approximately 21 and 18 dB respectively.

Does this actually work?  Yes - it does.  The sensitivity of the main receiver on both VHF and UHF is in the area of 0.35 microvolts or so when the AIP
is turned on - about the same sensitivity of a typical "commercial" (e.g. non-ham) receiver.  In metro areas, one can expect nearby repeaters to have signal
levels in the area of 1 to 100 microvolts - so even with the "AIP" mode turned on, one doesn't miss anything - and the intermod susceptibility is reduced
even more (that is, the "AIP" does an even better job.)  In more rural areas, there aren't usually the numbers of strong signals to cause intermod, so
you can operate without the AIP active.
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