how to assemble radio transmitter
#RF transmitter
#radio communication
#wireless signal
#antenna
#modulation
#frequency tuning
#electronics DIY
#RF components
#signal transmission
#radio hobbyist
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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...
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...
TRF Radios
A small Medium Wave antenna from a walkman with digital radio and a variable capacitor (VC) with two sections connected in parallel from an old Russian radio (2x280pF). It has been noted that in areas with strong signals, optimal performance...
Ground pole & 2-Half-Wave Dipole Antenna
This Antenna is most widely used all over the world. For example, when you see a police car it has a transmitter with Ground Pole Antenna. The body of the car serves as ground. It accepts load from a 50-ohm...
Loop-stick Antenna for AM band
Wound on a 3 foot length of PVC pipe, the long loopstick antenna was an experiment to try to improve AM radio reception without using a long wire or ground. It works fairly well and greatly improved reception of a...
Antennas for HAM transmitters
Antenna is the means by which a wireless operator puts his signal into the space and also through which he picks up the signals of the stations with which he wants to communicate. Hence after having a good Receiver and...
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...
ANTENNA DESIGN FOR FM TRANSMITTER
Two aluminum rods, each of length "L" in meters, are connected through an insulator as illustrated in the figure. A 75-ohm cable is fed from the center, similar to a conventional TV antenna.
This configuration describes a basic antenna system utilizing...
Field circuit diagram of the needle
The antenna consists of approximately 20 cm of insulation made from strands, which are glued together inside a small plastic box. An RF current is processed through two diode rectifiers, and a 10k potentiometer is connected to the pin field....