12 Oct '17, 5am

Homemade 6 GHz Radar, v3

The third version of [Henrik Forstén] 6 GHz frequency-modulated continuous wave (FMCW) radar is online and looks pretty awesome . A FMCW radar is a type of radar that works by transmitting a chirp which frequency changes linearly with time. Simple continuous wave (CW) radar devices without frequency modulation cannot determine target range because they lack the timing mark necessary for accurately time the transmit and receive cycle in order to convert this information to range. Having a transmission signal modulated in frequency allows for the radar to have both a very high accuracy of range and also to measure simultaneously the target range and its relative velocity. Like the previous versions, [Henrik] designed a four-layer pcb board and used his own reflow oven to solder all the ~350 components. This process, by itself, is a huge accomplishment. The board, much bigger...

Full article: https://hackaday.com/2017/10/11/homemade-6ghz-radar-v3/

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6 Roasters, 6 Questions: Sourcing Bloopers

dailycoffeenews.com 11 Oct '17, 2pm

I hadn’t drank much Burundi, I’d never roasted Burundi, it sounded exotic. I looked at the flavor notes that they had on i...