?I used ?Arduino UNOs in my two FS-4B systems which gives reasonable stability with a real ?XTAL can on the UNO.
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The frequency counter code for the FS-4B is a really some software magic that cascades two 16 bit counters in the Arduino.
The upper bound for the counter code is about 6 MHz or so. ?I suspect that hardware ?dividing the Drake PTO frequency by two or three before feeding it to the software counter may result in a better result. The resulting counter frequency can be easily upscaled in software.
The main objective of this project was simplicity and cost effectiveness. ¡?
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73, Bernie. VE3FWF
Real?radios glow in the dark
Ham Radio