Interesting article, not sure if it’s been posted before. https://www.doncio.navy.mil/chips/ArticleDetails.aspx?ID=4892 Daniel K6YIC http://K6YIC.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20200922/3929868c/attachment.html>