Hi
I still think that between N connector and antenna is a waveguide, It is multiscrew tuner .... I will make an citation (Engineers Handbook of industrial Microwave heatin - R. Merdith)... "Each screw provides a variable, capacitive susceptance whose amplitude is a function of its insertion into waveguide and the diameter of the screw.If four such screws are considered, spaced apart by lambda/8, then , for small reflections, the screws can be seen to give, at a reference plane located at the first screw an admitance adjustment of -+ jb for screws 1 and 3 and conductance adjustment -+dr for screws 2 and 4. Within the adjustment range it is therefore possible to generate reflection of any amplitude and phase simply by setting the screws for minimum net reflected power from load/tuner combination"
Ok ... I also found how to calculate this part, It is an old NIST document ..., But about lounch and output probes or maybe loops I haven t find nothing on net .
About adjustment to best mach is still a question, I do not know the impedance I have to match, It is in some connection with Rieke diagram which represent magnetron characteristics where a mismatch ( forom 50 ohm) conditions are evident.
Funny. Magnetrons, measurements etc. are an old technology from WW2, There is a lot of informations ( MIT courses), But when I want to find an answer for this specific microwave part for measurements ( I found iti is standardised part in an Japan standard ??) there is "blind spot" about this on Web pages.
Have a nice weekend ..
Best regards
Andrej