Receiver VFO Controlled CW Transmitter

Receiver Block Diagram

After working a contest or two it doesn't take a wise amateur long to understand that time is a premium. A kilowatt helps to bring contest points, but with the advent of highly selective receivers and crowded ham bands high power often goes unheard. Like snatching cola bottles out of the cases as the delivery truck drives by, contest operators have to be fast, smooth, and on frequency. And needless to say if we have our transmitter exactly on frequency at all times and are. taking up only one...

Home Brew Permeability Tuned VFO

Permeability Tuned Oscillators

For something like twelve years, I've been trying to build a good VFO. Unfortunately, such is the nature of Genus Hammus that after I built each one my requirements became stricter. A friend once told me that what I wanted was a crystal with a knob on it. Actually, I've tried that, but the range is too limited. I replied, wittily, that all that I needed to build what I wanted was a case built like a battleship, a device with power gain that produced no heat, and a variable reactance that wasn't...