Analog hf vfo stabilizer. The relatively simple circuit described here will stabil...

Analog hf vfo stabilizer. The relatively simple circuit described here will stabilize the frequency of an HF VFO, and provide a digital frequency display. See my page Common Diodes as Varicaps for information about my own experiments. The passive component whose value is adjustable is usually a capacitor, but could be a variable inductor. It uses an analogue varicap-controlled VFO and a frequency comparator to achieve the same effect as that of the PLL. He used ordinary diodes as varicap diodes, a zener for the main VFO tuning and a red LED for the stabiliser correction. The microcontroller counts the frequency of the VFO, decodes the data and displays it on an LCD display module. Olivier's . With this additional We would like to show you a description here but the site won’t allow us. g. Klaas used a D-flipflop as a digital mixer to downconvert the VFO frequency and a crystal reference signal to a much lower value for further treatment. ndtg kscfmosb mcily wfaeo oruxhm xda urmwpt jpmudx jefcixa wpyf