I'm open this theme, because there is few old ways to make not war with stability factor of LNB,
There is no mistake in theme name, not so simple,but it's really working.
Why build? Today I am conducting some tests with replacing an external LNB source or internally replacing XTAL and giving an external signal. In any case, I use 6 types or different LNB modes, such as STRONG R739, Octagon OSLO 1609 and others. In the end, another big question is why the same RDA3566 processor used in different (all) models does not use load capacitors and does not work with an external source? it is after each experiment - XTAL is still inside or deleted, etc.
I have idea how to build LNB, promissed phase noise in 10 GHz at offset 1kHz = -128 dBc/Hz. Is not cheaper device, ut is not consist of any programming code for microcontroller, no DDS/PLL e.t.c. "Clear" RF only.
The huge advantage of this diode / generator is that, despite the frequency multiplication, the losses in the phase noise index are scanty, there are practically none.