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Superhet Design: Homebrew XCVR Walk-Through Series

This will be a series explaining my most recent superhet HF transceiver design- one that I had originally planned to market to the prepper crowd. Then my health went to shit. The design is up for grabs. You may have it. I want to market multi-tap UNUNs, not a transceiver kit. NOTES: My design goals were very specific for this radio- with features found in no other- and geared specifically for the prepper crowd. The block diagram I presented here is a VERY generic one- not the one for my xcvr. But it’s close. All technical details presented are, and will be, directly related to my specific needs. The PCB layout talk will not be about how to use the EDA (electronic design automation) CAD package called KiCAD- but what I did with it to create my schematic and boards. I do not use KiCAD for automation- only it’s schematic and board layout functions and the rendering of gerber files for manufacture. Gerber files are CNC machine files which are in Vector Graphics Array format. It’s basically a comma separated values text document. They are not image or ‘picture’ files. They are simply a list of millions of mathematical positions in a 3-D realm. I glossed over everything quickly here, but want to stress that a HUGE advantage of superhet over DC is that you move the LO (local oscillator i.e. VFO) the hell away from your signals of interest at the RF input! A DC receiver can be just shockingly sensitive- and sound shockingly good. Very very deep sounding CW. Catch ya later guys- Chuck

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