I was finally going back through and looking at how the K1 filter works and really dig the idea of using the varactor diode to get the variable filter widths. Why was fixed xtal bandwidths chosen over sticking with this design? Especially now that I hear of a possible variable filter that will be able to plug into one of those locations? It seems that with that filter you'd have pretty much all the bandwidths you need (over however much range you can get out of the C range you get). Maybe I just answered my own question. Is it just that you'd not be able to get a wide enough range of widths by using varactors? So does that mean that when the variable filter comes out its only going to be for use at the lower end in the CW spectrum or am I missing the point here?
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