There are a lot of great ideas and circuits on WA3TFS’s page. He spans the SDR-HDR divide. He makes great use of simple SDR dongles. Check out his QRZ page and the web site that describes his projects in more detail:
The Amazing Rigs of WA3TFS
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SolderSmoke Daily News — Ham Radio Blog
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Thanks for the notice on your site. I design all my projects that may be duplicated to not require any test equipment other than a multi-meter or circitry built in. 73, Jim WA3TFS