: Unlike many consumer portables, the DX-390 included a Beat Frequency Oscillator (BFO) and fine-tuning controls, allowing users to listen to amateur (ham) radio operators and marine communications.
: Removing the "chuffing" sound or audio muting that occurs while turning the tuning knob.
Since you likely have the PDF, consider creating a physical copy for your go-bag.
Astroasis
墨空视觉
: Unlike many consumer portables, the DX-390 included a Beat Frequency Oscillator (BFO) and fine-tuning controls, allowing users to listen to amateur (ham) radio operators and marine communications.
: Removing the "chuffing" sound or audio muting that occurs while turning the tuning knob.
Since you likely have the PDF, consider creating a physical copy for your go-bag.
