Over on our Discord channel, some of those who have successfully built the SolderSmoke Direct Conversion Receiver are starting to experiment with Double Sideband and even Single Sideband. Andy KB7ZUT is experimenting with QER filters. He recently wrote:
My second attempt at a SSB crystal filter using the QER topology. I think laying out the crystals to resemble the filter profile you want should help 😏
I think the Radio Gods would be pleased Andy.
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hopefully when I turn it upside-down it doesn't become a notch filter... de KB7ZUT
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