https://rfcorner.in/tags/direct-sampling/Recent content in Direct Sampling on Dhiru's NotebookHugoenThu, 23 Jul 2026 00:00:00 +0000https://rfcorner.in/posts/better-sdr-ideas-1/Thu, 23 Jul 2026 00:00:00 +0000https://rfcorner.in/posts/better-sdr-ideas-1/<p>The idea is simple: build a low-cost HF receiver around a cheap high-speed ADC instead of repurposing an RTL-SDR.</p> <h2 id="teaser-costs">Teaser costs</h2> <ul> <li> <p>TARANG FPGA board (10K LUTs): &lt; $15</p> </li> <li> <p>ADC daughter board (with analog frontend filters and all): &lt; $10</p> </li> <li> <p>Total: &lt; $25, or possibly much less</p> </li> </ul> <h2 id="proposed-architecture">Proposed architecture</h2> <ul> <li> <p>Hangzhou Ruimeng Tech MS9280 10-bit, 35 MSPS pipeline ADC</p> </li> <li> <p>Low-jitter 35 MHz sampling clock</p> </li> <li> <p>Switchable input filters, gain and attenuation</p> </li> <li> <p>Small FPGA for capture, digital down-conversion and decimation</p>