Saturday, December 9, 2017

Xtal filter and pre-selector

I did some rather unscientific testing and found another option which maybe even better. If you want practice winding toroids it is for you.
This will be the Xtal filter pre-selector. It has a response like this.
The previous post had a pre-selector to keep the LO out of the RF input. This pre-selector will keep lower frequencies from the Xtal filter.
With this circuit the Xtal filter can be 2 Xtals in a TEE arrangement with 3 capacitors. So we can wind 3 coils and use 2 Xtals.
When I hear from the designer I see how this idea flies.

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