Most of the early PIN diode mods came from the information and articles
by Ulrich Rohde N1UL.
The PIN diode mods were mostly for 2nd order IMD problems. There were
claims for some minor improvements in blocking and 3rd order dynamic
range. However i seem recall most of the mods applied to low end radios
like the TS450 and TS50 which suffered badly from 2nd order IMD in
places like Europe. I also seem to recall that Signal One started
promoting the supposed advantages of the HP PIN diodes in the Mil
Packaged IC-781.
Maybe Ulrich with his well respected HF credentials and his vast
experience with collocated HF transmitters and receivers in military
markets became the main focus for all his measured improvements.
The data measured with very wide spaced high 3rd order intercept
points may be valid using better PIN diodes in such a severe RF
environments. Only he could answer these questions.
Craig
VK3HE
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