<story><title>A 74xx-Defined Radio (2021)</title><url>https://acidbourbon.wordpress.com/2021/04/11/a-74xx-defined-radio/</url></story><parent_chain></parent_chain><comment><author>deepspace</author><text>I knew there was going to be a 74HC4046 in there before clicking the link.  It is a venerable old workhorse.&lt;p&gt;When I was studying EE, 40 years ago, one of our professors always wore a lab coat with a pocket full of 4046s. He used to roam the labs and offer one to students struggling with designs.&lt;p&gt;It is such a versatile chip, with a VCO and &lt;i&gt;three different&lt;/i&gt; phase comparators.  If you have to do anything related to modulation and&amp;#x2F;or demodulation of signals below a few 10s of MHz, it may just solve your problem.</text></comment>
<story><title>A 74xx-Defined Radio (2021)</title><url>https://acidbourbon.wordpress.com/2021/04/11/a-74xx-defined-radio/</url></story><parent_chain></parent_chain><comment><author>nynyny7</author><text>When I had my &amp;quot;I want to build my own SDR&amp;quot; phase ;) ca. 15 years ago, I also used analog switches as a switching mixer - with a PLL running at 4x the desired frequency so I could utilize dividers to get nice 0°, 90°, 180°, 270° LO signals for IQ mixing. Brings back memories...</text></comment>