Neil E. Hodges reshared this.
After switching to brass legs for my 70cm dipole for strength, I started trimming and filing them down to get something working.
- At ~132mm measured from the coax, it was resonating well at 424.5 MHz with an impedance of 44.24+j1.987 Ω and an SWR of 1.138.
- At ~107mm measured from the coax, the impedance at 436.0 MHz was approximately halved with an impedance of 23.41+j7.66 Ω and an SWR of 2.200.
Between the feed point and opposing UHF connector, the coax is about 114mm long, which is very close to two wavelengths.
(%i1) 1.14 / (%c / 436E6 * 0.83);
(%o1) 1.9975262006020027I'm getting the sneaking suspicion that the coax is doing unwanted impedance transformation, but I'm not sure. What do folks think?
How to respond to societal collapse | Sarah Wilson | TEDxSydney
Science and modelling shows our civilisation is in existential collapse, but what if this terrifying reality is the prod that humanity needs to live fully and in attainment again? In this provocative talk, international best-selling author and journalist Sarah Wilson explores the upside of losing what we’ve been taking for granted. Sarah Wilson is a multi-New York Times and Amazon best-selling author, podcaster, social philosopher and renegade.She is the host of the podcast Wild with Sarah Wilson and writes the popular Substack newsletter This is Precious, which has an engaged community of 57,000 subscribers.
Sarah is known globally for founding the I Quit Sugar movement - a digital wellness program and 13 award-winning books that sell in 52 countries - which saw millions around the world transform their health. In 2022 Sarah sold the business and donated 100 per cent of the proceeds to charity.
Her New York Times bestseller First, We Make the Beast Beautiful is described by Mark Manson as “the best book on living with anxiety that I’ve ever read” and was featured as a book of the year on NBC’s Today Show. Her book This One Wild & Precious Life won the 2021 US Gold Nautilus Award.
Sarah is an advisor to corporations and universities on media, mental health and existential risk. She’s guest lectured for the University of Cambridge’s Sustainability and Leadership masters course and partnered with organisations such as the Climate Council, Harvard University and Intelligence Squared on campaigns. This talk was given at a TEDx event using the TED conference format but independently organized by a local community.
Neil E. Hodges
in reply to Neil E. Hodges • •