How can i use the device for higher frequencies

I would like to use krakenrf to determine the direction to the transmitter even at frequencies above 1.7ghz. I have thought of a setup for this. The idea is to connect a modified LNB to each of the five inputs. I would desolder the 20MHz quartz on all LNBs and replace it with a common frequency generator. Has anyone done this before?

Yes if all the LNBs are run from the same clock, it should be possible to do this.

We have tested a downconverter prototype that works in a similar way to what you show (without the LNBs though) and it works.