Parking lot indicating light

One of my friend needed a three color indicator(as shown in the picture) for his underground parking lot management system. However, the original hardware has only two wires(including power) that can be spared for the indicating light. However, I found a similar product which uses a very smart design to achieve this function. The schematic […]

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EU1KY ANTENNA ANALYZER

Introduction EU1KY antenna analyzer is a very cheap 600MHz VNA based on SI5351 clock generator, SA612 double balanced mixer and a STM32F7 discovery board. The original source is here(https://bitbucket.org/kuchura/eu1ky_aa_v3/wiki/Home). KD8CEC’s website(http://www.hamskey.com/2019/02/assembling-faa-450-antenna.html) revealed much more about this analyzer, including detailed instructions on how to assemble it, and several popular modifications. Moreover, the CEC firmware has included […]

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