permeability tuning การใช้

• This set achieved excellent stability for the time due to high build quality and the use of a permeability tuned oscillator ( PTO ) in its second conversion stage.
• Other design innovations included crystal bandwidth filters and a permeability tuned oscillator ( PTO ) capable of extremely linear, stable tuning and a dial resolution of better than 1 kHz across all amateur HF ( shortwave ) bands.