Dual Band 2m/70cm 4/5 Element Yagi

I was look for a small compact dual band antenna for 2m /70cm. I came across a design by DK7ZB and can be found here http://www.qsl.net/dk7zb/Duoband/4+5_2m-70cm.htm. The boom is square 19mm x 1m and uses 10mm elements. The boom clamps are 3d printed using black PLA. Below are the measurements using 8mm and 10mm tube. The …

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ADF4153 12Ghz PLL

I have been playing around with a small ADF4153 12Ghz PLL with the idea of using it as a LO (11.736Ghz) for a 47Ghz transverter. The unit contains a transistor VCO controlled by the ADF4153 PLL. The output is feed into a HMC189 passive frequency doubler, then through a BPF, a HMC369 active frequency doubler, through a BPF once …