Antenna Circuit Analysis
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Basic RF Oscillator
Create a basic RF oscillator. The circuit is very simple, so complex calculations will be omitted, and component selection will be simplified using calculators. For this example, the target frequency is 7 MHz. The circuit includes a transistor (TR1) on...
6 Channel RF Remote Control
This project creates a simple but valuable wireless remote controller. It has as many as 6 channels (a rare feature for remote control devices) and transmits encoded MM53200, UM3750, or UM86409. Of course, you can omit the button and make...
Reflex Radio Receiver
The RF signal is transmitted from the antenna through CI to a tuned circuit consisting of LI and C2. One end of L2 delivers the RF signal to the base of Q1 for amplification, while the other end connects to...
Active Antenna for Medium Wave
This circuit is designed to amplify the input from a telescopic whip antenna. The preamplifier is intended to operate within the medium waveband, covering frequencies from approximately 550 kHz to 1650 kHz. The required tuning voltage ranges from 1 to...
Q- Multiplying Loop Antenna
This circuit is designed to be used in conjunction with the standard 4 foot square loop used in MW for long distance reception.
The described circuit is intended for use with a standard 4-foot square loop antenna, optimized for medium wave...
RF Field Strength Meter Circuit
A sensitive and reliable RF field strength meter is an invaluable instrument in amateur radio and radio-controlled model applications. This field strength meter is utilized to align antennas for optimal gain and to determine the transmission range of radio controllers....
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...
6-17 MHz SW reciever
Its very simple as It uses only 3 transistors 2n2222. The Coils can be altered to change the range of reception by lowering or highering the frequency. More: This circuit is a SW band receiver of range 6 to 17...
One Receiver
RF Cafe visitor David M. requested the scanning and posting of an article from the January 1963 edition of Popular Electronics, authored by Philip Hatfield from the Receiving Tube Department of General Electric. The article describes a straightforward design utilizing...