https://stream.echo6.co/videos/watch/00b55084-596d-4389-90d0-2905c0aa7739 Want to hear if your antenna coupler is adjusted correctly rather than having to look at a meter? Here's how you do it. Just get a 555 timer and add a few extra parts. You might even be able to build it inside your existing VSWR meter or resistive antenna bridge. And it even works down to 500 milliwatts or less power. It's a versatile circuit that could be useful for other applications as well - eg wheatstone bridges if you don't have a meter movement. PS: If you liked this video please consider supporting Amateur Radio VK3YE by: Subscribing on YouTube,, Checking my books page at https://books.vk3ye.com, Shopping on Amazon via: https://amzn.to/3iiDQXv, or, Shopping on eBay via: https://ebay.us/i9DuWP (then if you buy something I'll get a small commission at no cost to you) Sun, 26 Apr 2026 17:28:47 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/00b55084-596d-4389-90d0-2905c0aa7739 All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.