Radio Theory and design

The old world way of doing it. Based on the formulas posted earlier.

The input should be matched to the antenna and the amp input. I will use a bandpass filter for 80 meters. First the page from the book. an...

Years ago my friend Andy built the 40/80. It is a good example of the dual conversion as presented in the block diagram. What I h...

If you observed the effects of adjusting the Vcap ratio by adjusting the low end capacitance and the high end by adjusting the "trimmer...

As simple as I can state it the tuning range is determined by the CIRCUIT high to low capacitance. When you look at a schematic you may se t...

Notice the time delay when power is switched on.  The CEMF in the coil delays the current buildup.  The current continues to build as long a...