https://stream.echo6.co/videos/watch/268959c8-836b-4b4a-aadc-4325f0f1f8e4 Testing a homebrew 40m direct conversion double sideband transceiver. This rig is the direct conversion receiver in the 'bedlam' video with a transmitter section added. This comprises a BC547 transistor microphone amplifier, a 2N3053 driver and a BD139 PA. Power output is 1.5 watts. Afternoon tests when portable were unsuccessful with no contacts made. However evening tests from home were very successful, with 5 contacts made over a couple of hours. An article describing this rig appears in Lo Key June 2011. The circuit is very similar to DSB rigs designed by M0DAD and ZL2BMI (google these callsigns for circuits). 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) Sat, 09 May 2026 06:02:43 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/268959c8-836b-4b4a-aadc-4325f0f1f8e4 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.