Well, I guess THAT flushes even the very last moral obstacle against hacking Rigol-Stuff down the toilet.
I certainly don't feel bad about them at all anymore and just added the necessary components to my next Digikey-Order. ^^
Is there a possibility to give the PLL some "proper" values? If I understand it correctly, the Jumpers can be used to disconnect the PLL from the rest of the SPI-Bus.
Should be possible to put a Attiny in there to program the PLL with the right values upon power-up.
Unless the scope is doing some tricky stuff with the PLL under certain operating conditions.
Btw. isn't there a Rigol-Representative here on the Forum? I wonder what he has to say about this apparent aversion to reading the datasheets