Lightning and other mishaps
About a year or so ago, I was presented with a Philips transistor radio that according to the owner had been struck by lightning. Fortunately, the lightning strike must have been quite some distance...
Category: Theory
Velocity Factor of Coax
“The velocity factor (VF), also called wave propagation speed or velocity of propagation, of a transmission medium, is the speed at which a wavefront (of an acoustic signal, for example, or an electromagnetic signal,...
Dipole antenna design. Some theory and construction.
A dipole antenna is a symmetrical antenna, consisting of two quarter wave elements, connected to each of the two conductors (inner and outer) of a coaxial cable. You will need a center insulator for...
Amplifier impedance measurement
Starting with the EMRFD Fig 2.57 amplifier as a base, you can measure input returnloss using a return loss bridge. Return loss can be translated into VSWR and impedance. If the return loss is...
Calculations and Simulations with Pads and Feedback Amplifiers
One of my favorite circuits uses a bipolar transistor with two forms of negative feedback. One is parallel feedback in the form of a resistance from the output collector back to the input base....
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