https://stream.echo6.co/videos/watch/aff6c74d-3a40-48b5-8e67-0fa57c68f258 Possibly the simplest possible pulsed beacon transmitter. Video describes where I got the circuit from, modifications to make it light dependent and complications along the way. I then do a range test on a local beach and get a surprising distance for a 1 transistor circuit powered by 1 x AA battery. The beacon operates just below 37 MHz using a commonly available 36.864 MHz crystal. In Australia frequencies around this are allocated to 'low interference potential devices' with a 100mW EIRP power limit. This transmitter would have an output of a few milliwatts only. Contents 0:00 Introduction 0:23 Circuit of previous 2 transistor beacon 1:06 Inspiration for this project 1:29 My unit and description 2:05 Circuit of 1 transistor beacon and description 3:07 Important components 3:53 Outside range test - How far? 5:02 Summary and applications 5:22 Hand-carried QRP Antennas (book) 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​​​​​​​​​​​​​​​​ to see if any appeal,, 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, 04 May 2026 00:31:16 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/aff6c74d-3a40-48b5-8e67-0fa57c68f258 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.