I found those 4.224 Crystal oscillators (ex equipment) on eBay .
Divide 4224 by 32 (first 8 and then make the quadrature signals), and the LO frequency ends up on 132 kHz. Not bad for a 136 kHz SDR.
Filters: Crystals, LC, Mechanical, SAW, etc.
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*I thought this was an interesting look at filters and crystals. And even
mechanical filters. Remember: Those little SAW containers became the
lapel pi...
1 day ago
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