Good morning! On Sat, 19 Jul 2014 18:38:17 -0700 "Richard (Rick) Karlquist" <rich...@karlquist.com> wrote:
> I did some tests of residual phase noise using an > Agilent E5505A and found that air coil inductors > did not add noise (at least down to my noise threshold) > but that ferrite core inductors had easily seen noise. > It was on the order of ADEV = 1E-10 close to the > carrier. I would describe this as noise rather > than non-linearity. Interesting. Do you still have that data? It woud be very interesting to have a look at it. > In my case, the inductors were used to make tuned > circuits. This is different than your case where > the ferrite is being used to make a transformer. > So as they say "your milage may vary". And you > probably don't have the option of an air core. I also pondered using air core transformers, but i fear that the noise pickup of those is much worse than what the ferrite would do. > After obtaining the E5505A and using it for a while, > it became clear that anyone who is serious about > component noise has to measure the components of > interest to them in the application of interest > to them on the E5505A or equivalent. (And the > Agilent E5202A Signal Source Analyzer isn't > equivalent.) Unfortunately, the E5505A is quite > expensive and requires a highly skilled user. A E5505 is slightly out of my budget. Is there any similar system that could perform on a similar level, but is slightly cheaper? I dont need 26GHz of bandwidth after all. > You mentioned "theory" several times. This sort > of thing is 1% theory and 99% experiment. Or > another way of putting it is you do a bunch of > measurements and then construct a theory to > explain what you already know experimentally. Well, yes. The catch here is, that i dont have the equipment to measure on that level. And i would like to understand what i am dealing with. Constructing a theory out of experimental data works only if you can trust the data. And even then it's a damn lot of work to have something consistent and half way general. Attila Kinali -- I pity people who can't find laughter or at least some bit of amusement in the little doings of the day. I believe I could find something ridiculous even in the saddest moment, if necessary. It has nothing to do with being superficial. It's a matter of joy in life. -- Sophie Scholl _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.