What about the old idea of advanced manuals for SA-2E and SA-3B?
With the "hidden" switches use and some technique advices?!

Most of these are already (or will be) discussed here.

BTW:. I'm having some trouble finding targets on Sinai situation with SA-3B... Could anyone give me some useful advices?
I just can't find the targets in distance and range, i think my technique was some flaws.

Most important is at page 16 of the manual...
Important to note, that by the usage of SDC, low radial speed (hovering or parallel flying) targets can completely disappear from the indicator.
SDC should be used with 40km range mode only.