Hi Dave,
Thank you for your investigation and conclusion.
Maybe the next step is to switch over to an external placed OCXO as reference oscillator with much lower drift and better phase noise.
It has to be synchronised for one time against a GPS reference and if kept on 24/7 it will remain within a few Hertz accurate over months. This is how I do it.
I guess that with this approach any currently suspicious wobbling LNB will become a "pro" LNB.
73 de Cor
There exists already a very complete LNB overview on the internet, including specs and board photographs.
Look here please: http://www.pabr.org/radio/lnblineup/lnblineup.en.html
Maybe we can use this file as a basis and expand it /refer to it with a spreadsheet showing links to specific product measurements and modification articles.
There is very much information available, but it is hidden in forums, twitter and personal sites.
Especially info about the improvement of stability by remote feeding the LNB with a rock-stable/low phase noise LO signal can be interesting for many OM's.
73 de PA0P Cor
How about this article, a very complete and actual overview of 10GHz LNB's.
http://www.pabr.org/radio/lnblineup/lnblineup.en.html
73 de PAoP
The HD-line HD-BP2 is a great product and easy to modify.
Still available a.o.here:
https://www.amazon.co.uk/dp/B004Y62XYC/?tag=wwwpabrorg04-21
Succes!
