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Shhhh Covert Communications!
I’ve been thinking for a while about discrete HF communications. I often read about issues in the UK with radio amateurs falling foul of local government enforcement action: Radio enthusiast at risk of losing lifelong hobby – BBC News In the UK most amateur radio antenna’s do require planning permission although this is rarely enforced. […]
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Really Weird Twisted Sisters!
I’ve been building a QMX+ HF transceiver kit recently, and one feature really caught my attention: the “really weird twisted sisters transformer” (RWTST).It’s a great reminder of how, at RF frequencies, the smallest physical details can make or break circuit performance. Earlier versions of the QMX+ used a conventional output transformer. But some builders noticed […]