There was also a question regarding phase noise at 23cm, there is already post relating to this here: https://www.funcubedongle.com/?page_id=81#comment-110
In fact the first time I ever tried SSB for real at 23cms (as opposed to with a nice clean signal generator) was about a month ago when I was at the world infamous Orwell Truck Stop frequented by Martlesham microwavers in need of a Full English. While demonstrating, an impromptu heckle from the assembled crowd (thank you Sam G4DDK) asked if the FCD would pick up the Martlesham 23cm beacon with the attached whip, to which I obliged (with some trepidation at the time I hasten to add as this was a rather early spin) and it worked perfectly with a nice clean tone.
Howard