Amateur Radio Theory Articles

Amplitude Modulation

(1) The low level generation of AM (DSB + Carrier) and the progressive amplification of that RF signal with the final stage being a Linear RF amplifier--Class AB. In the case of the low level modulation approach, one could use either a 2 quadrant or 4 quadrant...

IC 741 Tutorial

What exactly is an OPerational AMPlifier? Let's define what that component is and look at the parameters of this amazing device. An operational amplifier IC is a solid-state integrated circuit that uses external feedback to control its functions. It is one of the most...

IC 555 Tutorial

The 555 timer IC was first introduced around 1971 by the Signetics Corporation as the SE555/NE555 and was called "The IC Time Machine" and was also the very first and only commercial timer ic available. It provided circuit designers and hobby tinkerers with a...

Valve Basic Theory

Basic Understanding of Valves: The vacuum tube, in its very primitive form, evolved from the light bulb. Invented by Thomas A Edison in 1883, the incandescent lamp, had 3 basic necessities to operate: The Envelope, The Filament, The Vacuum The envelope is basically a...

Jul 24, 2022 | Amateur Radio Theory

So What Is A Frequency Synthesizer? The answer to that is easy, it is a programable frequency multiplier, usually...

Frequency Modulation

Frequency Modulation

Jul 24, 2022 | Amateur Radio Theory

Frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of...

Amplitude Modulation

Amplitude Modulation

Jul 24, 2022 | Amateur Radio Theory

(1) The low level generation of AM (DSB + Carrier) and the progressive amplification of that RF signal with the...

Primary Cell

Primary Cell

Jul 22, 2022 | Amateur Radio Theory

Primary Cell: When dissimilar materials like zinc and carbon(or copper used in place of carbon)were immersed in a bath...

Diodes and Triodes

Diodes and Triodes

Jul 22, 2022 | Amateur Radio Theory

When a diode is connected in series with other circuit components, current can flow in only one dirction in all of...

Capacitors

Capacitors

Jul 22, 2022 | Amateur Radio Theory

As we have studied the effects of electricity flowing through wires, and have discussed resistors, coils, and metering...

Magnetism

Magnetism

Jul 20, 2022 | Amateur Radio Theory

Almost 20 centuries ago, an ore called magnetite was found and was called “lodestone” or leading stone. Name magnetism...

Direct Current

Direct Current

Jul 18, 2022 | Amateur Radio Theory

Sometime over the years, some bright soul determined that it would be difficult to draw a picture of every component...