https://rfcorner.in/tags/challenge/Recent content in Challenge on Dhiru's NotebookHugoenSun, 28 Jun 2026 00:00:00 +0000https://rfcorner.in/posts/one-euro-trx/Sun, 28 Jun 2026 00:00:00 +0000https://rfcorner.in/posts/one-euro-trx/<p>I learned about the <code>Sub-1€ TRX</code> challenge from Ismo (OH2FTG) - thank you (maybe for getting me addicted?).</p> <h2 id="the-constraints">The constraints</h2> <ul> <li> <p>Sub-1€ TRX, with LCSC parts.</p> </li> <li> <p>This excludes the PCB, so it can be 10x10 2-layer or 5x5 4-layer.</p> </li> </ul> <h2 id="my-design-ideas">My Design Ideas</h2> <ul> <li> <p><a href="https://www.lcsc.com/product-detail/C381154.html">DreamLNK DL-RXC2016BH-433M for OOK RX</a> - 40 USD cents</p> <p>Plus Radio-less Direct-TX-Signal generation using CH32V003 SOP-8 MCU! - 15 cents</p> </li> <li> <p>Better deal: <code>WIRELESS WL4456</code> (TX) and <code>WIRELESS WL550</code> (RX) pair - 17 cents</p>