https://rfcorner.in/tags/portability/Recent content in Portability on Dhiru's NotebookHugoenTue, 06 Jan 2026 00:00:00 +0000https://rfcorner.in/posts/best-power-supply-for-fieldops/Tue, 06 Jan 2026 00:00:00 +0000https://rfcorner.in/posts/best-power-supply-for-fieldops/<p>This short article describes a flight-safe power supply for FieldOps.</p> <h2 id="component-list">Component List</h2> <p>Simply get these:</p> <ul> <li> <p><a href="https://punoscho.in/product/usb-qc-pd-afc-trigger-decoy-board-module-9v/">USB QC/PD AFC trigger decoy board (9V)</a></p> </li> <li> <p><a href="https://punoscho.in/product/usb-qc-pd-afc-trigger-decoy-board-module-12v/">USB QC/PD AFC trigger decoy board (12V)</a></p> </li> <li> <p><a href="https://punoscho.in/product/usb-qc-pd-afc-trigger-decoy-board-module-15v/">USB QC/PD AFC trigger decoy board (15V)</a></p> </li> <li> <p><a href="https://www.mi.com/in/product/xiaomi-pocket-power-bank-pro-10000-mah-33w/">Xiaomi Pocket Power Bank Pro 10000 33W</a></p> <p>This one does 9V, 12V, 15V and 20V without any problems.</p> <p>OR</p> <p>A 65W USB PD power bank - not needed for 5 to 10W QRP FieldOps</p>https://rfcorner.in/posts/choosing-a-coax-for-field/Wed, 05 Nov 2025 00:00:00 +0000https://rfcorner.in/posts/choosing-a-coax-for-field/<p>Setup: Si5351 RF generator (@ 28 MHz) ➔ GSD-Hacks-v5 digital amplifier ➔ 7th order LPF ➔ {COAX-UNDER-TEST} ➔ Digital RF power meter ➔ Dummy load</p> <h2 id="results">Results</h2> <p>Results at 13.8V drain:</p> <table> <thead> <tr> <th>Coax Type</th> <th>Power Reading</th> </tr> </thead> <tbody> <tr> <td>RG-58 (7 meters)</td> <td>4.5W</td> </tr> <tr> <td>RG-316 (7 meters)</td> <td>3.9W</td> </tr> <tr> <td>RG-188 (7 meters)</td> <td>3.9W</td> </tr> </tbody> </table> <p>Results at 15V drain:</p> <table> <thead> <tr> <th>Coax Type</th> <th>Power Reading</th> </tr> </thead> <tbody> <tr> <td>RG-58 (7 meters)</td> <td>5.4W</td> </tr> <tr> <td>RG-316 (7 meters)</td> <td>4.7W</td> </tr> <tr> <td>RG-188 (7 meters)</td> <td>4.7W</td> </tr> </tbody> </table> <p>These measurements appear to match those from <code>Eric, WD8RIF</code>.</p>