I have amply replied to ALL of your questions in the course of this thread. Regarding the necessity for isolation I have replied not with my own words, but with those of Roger. I again upload the link for you to read:viewtopic.php?f=5&t=540&p=12269&hilit=local+oscillator#p12269
For all the other questions my last post above is a summary of my detailed replies, which have been prepared, in the course of this thread, with painstaking care and a lot of personal work.
I do not know why you are being so provoking and confrontational both in my regards and towards other followers of this thread. Please stop this attempt at confrontation. If you wish to expose your own theories and experiences on antennas, RSP Receivers and VSWR you can start your own thread, there you could explain them at will. By your actions you have only succeeded in filling a thread devoted to the design and construction of 3 dB hybrid couplers with confrontation and extraneous arguments, completely confusing the technical information therein provided.
Please understand that the main motivation of this Forum is technical assistance and sharing of knowledge, not fights amongst those who shout strongest. If you insist I shall be compelled to report your provocations to the Site Administrator. You did so well, once, with another controversy, to invite all contenders to take it easy and go and walk the dog (as sdrom33 reminded you already). With a smile I tell you to please heed your own wise advice.