The Arduino drives a frequency synthesizer and an OLED display. A mixer combines the IF signal with the frequency the Arduino commands. The radio had a “clarifier” which acts as a fine tuning ...

[Joshua Woehlke] wanted to add a similar display to his 486 ... to hold a common 0.96″ SSD1306 OLED. From there it was just a matter of wiring it up to an Arduino and writing some code to ...