https://stream.echo6.co/videos/watch/6e586251-5701-4cc7-8cf0-66e8c65c7220 More experiments with the 555 voltage controlled oscillator. This time connected to a diode and short antenna to detect the presence of RF. It can detect a 1w VHF/UHF handheld from about 2 or 3 metres away. Useful for testing radio gear, antenna directivity or for ARDF/foxhunting. 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) Mon, 13 Apr 2026 11:50:31 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/6e586251-5701-4cc7-8cf0-66e8c65c7220 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.