JA2NKD Arduino VFO

I have been having fun with the JA2NKD Arduino, AD9850 and 2.2″ TFT VFO – destined for use with once of my Bitx40s. I also notice that using a similar circuit Matsuura Ryuu has made available the code for his RF Analyzer incorporating a signal generator, power meter, frequency response visualizer and HF antenna analyzer – this looks very interesting. My initial testing with both sketches and my breadboard prototyping looks very promising (see below). I also noticed that another Japanese amateur, Akio Mizuno JA2GQP, is offering a similar VFO circuit but this time replacing he AD9850 with and si5351a (using one of the spare clocks this si5351 variant also includes a BFO – very nice and similar to something I have seen Paul Darlington M0XPD do with the Si5351a (details on his blog and also see here for the production version: http://m0xpd.blogspot.co.uk/2015/04/si5351-shield-production-pcbs.html

The original schematic

An updated version with touch panel display is here: Homebrew Radio JA2NKD: VFO Controller 8.0 (Aruduino Due with touch panel) (30 Jun 2020)

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