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an active whip receiving antenna
In the pursuit of effective small antennas, an active whip antenna was constructed. This compact vertical antenna is linked to a preamplifier, which serves to convert the high impedance of the 50-ohm receiver and coaxial cable. Various designs exist for...
Antenna Tuning Unit
A simple passive circuit is designed to match an antenna to a radio receiver without requiring any power. This circuit is beneficial for shortwave listeners and can also utilize a medium wave coil to tune into the medium wave band....
case stepper
Beige Bag Software has been offering affordable and innovative circuit design tools since 1990. B2 Spice provides schematics as well as analog, digital, and mixed-mode electronic circuit simulation. It integrates with EAGLE and CADSTAR PCB software.
B2 Spice is a powerful...
RF Remote Control Encoder and Decoder Chips Explained
Creating a universal remote control system has become quite straightforward. One can acquire the necessary chips, assemble them, and the high-tech remote control device will be operational. This document discusses specific remote control chips designed for this purpose. The IC...
Low Frequency Antennas
Homemade antennas can significantly enhance the performance of AM and FM radios, short-wave receivers, and scanners. For enthusiasts of talk radio, experimenting with AM band antennas can lead to the ability to receive broadcasts from across the country with surprising...
Active Antenna
Antennas that are much shorter than 1/4 wavelength present a very small and highly relative impedance that is dependent on the received frequency. It is difficult to match impedances over a decade of frequency coverage. Instead, input stage Q1 is...
McCoy Mighty Midget Transmitter
The circuit employs a 6GW8 triode-pentode in an oscillator-amplifier configuration that demonstrates an unconventional application of oscillator principles, coupled with a lack of attention to amplifier stability concerns. Consequently, this transmitter should not be replicated or operated without significant modifications...
Test Transmitter
The Test Transmitter (A3020) is a combination of three circuits designed to test the Subcutaneous Transmitter (A3019) and to analyze surface acoustic wave (SAW) voltage-controlled oscillators (VCOs). The A3020 incorporates the complete A3019 circuit in its central section, which closely...
Radio Frequency Circuits
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