- Published in issue 2/1998 on page 18
Frequency display and VFO stabilizer
One of the most frequent topics for discussion among the many ‘Home Brewers’ on the amateur bands is the difficulty of building a VFO that is stable enough to be used on all of the HF bands. The relatively simple circuit described here will stabilize the frequency of an HF VFO, and provide a digital frequency display. The display will allow for the different frequency offsets required for USB and LSB, and the fact that the VFO frequency may be above the signal frequency on some bands, and below it on others.