Thomas,
I did check quality of the module by using a high quality audio input, a dbm and two modules. Its easy to see phase noise
But its difficult to make impovements as you need to improve both to see effect.
I do have a high quality xco but at 10MHz I would need to use 5th overtone to come to the output frequency of the module. Will try if that works.
I also could use the cavity filter or a stub notch filter to surpress the main output and measure the power of far out phase noise.
The layout of the green module allows decoupling of all supply lines so I am trying inductors for isolation?
When using a high dynamic range sdr to analyze the 3rd IF I saw clearly the changes in the phase noise when making changes to the ADF4351 settings. But this measurement is basically the same as using two modules and a dbm.
Any advice on how to measure performance of a single module is very welcome
