The PIN diode discussion must be referring to the Ulrich Rohde mods.
I have done it on my ICOM 765 with negligible results, but then for
2nd order intermod to be a problem, I believe (from what I remember)
the offending signal must be fairly strong. In other words, this was
a mod that multi-op contesters would be interested in, or folks like
me who have ham neighbors that give them fits! HI! About the time I
got my mod done, the neighbor moved. Guess I outlasted (or outblasted?)
him. He was running a TS-430, and, WOW, did it have phase noise on the
transmitted CW signal! Of course, no mod in my RX would help that.
73, Duane AC5AA
Duane A. Calvin
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