> Actually a network analyzer works better than a combination sweep > and marker generator. Remember that when you change isolation, > you are also changing impedance so you need to measure swr as well. > > There are other ways. Read Gary's excellent post carefully. > > -- > Larry W1HJF > rapp at lmr dot com >
Unfortunately, I doubt that I can afford a network analyzer either; and I curently don't know how to use one if I happened to come across one to use. I don't understand what you mean when you say "when you change isolation, you are also changing impedance so you need to measure swr as well". I expected that the complex impedance of the cavity might be changing as we are changing its tuning stubs; but I thought that a resonance (with a low SWR) was essentially what we are getting when we were adjusting the stubs in the cavity to peak the bandpass at the desired frequency. Am I wrong in this assumption? Either way, how do I set this up, and where would it fit in a test procedure? Which post (from Gary) are you referring to; and what specifically should I be paying special attention to? Thx, Vern (W6NCT)
