• FlexRadio Review
    I have both the Flex-6400 and Flex-6600; both arrived in 2020 during a pandemic, so they have seen substantial use. They’ve both been used during contests, some of which were serious efforts. I also have the Power Genius XL amplifier, which has been similarly used. The features of each piece of hardware is different to
  • Two-mode laser transmitter and receiver
    At the 2005 National BSA Jamboree, I saw a demonstration of a QSO via laser. I recently found the document I had been given at that time and am uploading it here as I can find very little mention of it online. I have not built this, and obviously the component prices no longer apply
  • Proper feeding of non-resonant antennas
    Coax becomes very lossy at high SWR. If you are feeding your non-resonant antenna (vertical, dipole, or any other design) with coax and utilizing a tuner at the shack end of the feedline, you’d be surprised by the amount of power you’re losing. Remember that your in-shack tuner does not tune the feedline to the
  • Coax loss charts (from W3LPL)
    Frank, W3LPL posted helpful coax loss charts to the CQ-Contest email list some time ago. I’ve used them extensively, particularly in deciding if it was necessary to use LDF4-50a hardline over RG-8. I’m reprinting this here, with credit to Frank, so it is not buried in the email list archives. Note: charts may not format
  • Inverted-L myths
    The venerable Inverted-L is the most popular antenna for the low bands, due in large part to its simplicity. It has enabled many hams to get on 80, 160, or even lower from their city lots. Unfortunately, its ease-of-use has allowed substantial misunderstandings as to design theory. This article will address several of the most