Thru the years I have used all kinds of methods to tune duplexers. The first was a diode detector that fed a voltage to an O'scope. The signal generator was an HT. Next was an IFR-1500 and pads on the input/output of the cans. My present mode of tuning is with a network analyzer. While all techniques worked (kind of) the network analyzer is by far the best. It allows me to not only see the pass/notch curves but also tells me the impedance that the duplexer is presenting to the load. This allows me to peak the cans while keeping the match at as close to 50 ohms as possible. You don't see this with the other tuning techniques.
I encourage any method of tuning that works for you, but I have learned the value of using the proper tool for the job. Not everyone has access to a network analyzer. I am fortunate to have access to one. 73, Joe, K1ike Eric Lemmon wrote: > Morris, > > This is a very interesting thread, and it prompts me to make a general > comment about duplexer tuning. Please do not take any of the following to > be a criticism of your friend's knowledge, equipment, or procedures. >
