Curious about the result if we made our own crystal filter.
The design uses 4 8 MHz Crystals that has been selected for match in frequency.
I tested again and the variation is just about 30Hz.
After some design using SimSmith and tweaking to offset some imperfections, I finnaly ended up in 750Hz BW Filter at 7996.18 KHz.
Here is the frequency response that was obtained in the first try.
The design uses 4 8 MHz Crystals that has been selected for match in frequency.
I tested again and the variation is just about 30Hz.
After some design using SimSmith and tweaking to offset some imperfections, I finnaly ended up in 750Hz BW Filter at 7996.18 KHz.
Here is the frequency response that was obtained in the first try.
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