1.0Johnson's Techworldhttps://johnsonfrancis.org/techworldJohnson Francishttps://johnsonfrancis.org/techworld/author/jf/rich600338<blockquote class="wp-embedded-content" data-secret="uicF2abidp"><a href="https://johnsonfrancis.org/techworld/checking-antenna-tuning-with-nanovna/">Checking Antenna Tuning with NanoVNA</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://johnsonfrancis.org/techworld/checking-antenna-tuning-with-nanovna/embed/#?secret=uicF2abidp" width="600" height="338" title="“Checking Antenna Tuning with NanoVNA” — Johnson's Techworld" data-secret="uicF2abidp" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://johnsonfrancis.org/techworld/wp-includes/js/wp-embed.min.js </script> https://johnsonfrancis.org/techworld/wp-content/uploads/2025/04/Clipboard_04-02-2025_03.jpg1294728NanoVNA is a very hand and relatively inexpensive Vector Network Analyzer which can be used to optimise the performance of the antenna. Here we will see how the NanoVNA tracing tells us if the antenna has been optimized by the automatic antenna tuner of N7DDC design. I am checking the performance of my 80m center […]