?I have been thinking about building an 8 Xtal version of the filter myself.
?I had not thought about using variable caps, nor varactor diodes.
?I am building a bare board BITX20, and I can build the Xtal filter on a sub board, which can make it easier to install, especially if I use? 2 and/or 3 pin connectors with shortest possible wires to connect.
?I could choose between 10Mhz and 12Mhz.
?Even maybe a higher frequency like 25 or 26Mhz.
?I don't have access to a spectrum analyzer, though I thought about building one of sorts.
?I can readily check the actual frequencies of the Xtals, as I have 3 frequency counters.
?At least I think I have 3 that will work.
?One in the MFJ antenna analyzer, an older LED Heathkit, and a much more recent counter that will count up in the Ghz ranges. It also has a crystal osc./tester, but the socket is klutzy, and you need to hold? the Xtal in place.
?Assembling an Xtal tester that will work well enough for what I need.
many of us have limited test gear, so have to make do with what we have or can cobble up.
