U.H.F. Receivers
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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...
Armstrong Oscillator
The Armstrong oscillator is utilized to generate a sine-wave output with a constant amplitude and fairly stable frequency within the RF range. It is commonly employed as a local oscillator in receivers, as a source in signal generators, and as...
Simple RF Power Meter
Many beginners trying out their skill with QRP TX for the first time have to overcome many problems before they are able to come on the air. One usual complaint is that everything is working fine, but the signal is...
Wireless-fm-microphone
Transistor Q1 functions as an amplifier for the condenser microphone MIC1. The output from Q1 is fed to the base of transistor Q2 through a 4.7 µF capacitor. Capacitors C2 and L1 form an LC tank circuit, which is utilized...
Schematic Diagram UHF Wireless Video Audio Sender circuit andexplanation
Wireless audio and visual transmission to a TV. The TV functions as a receiver, eliminating the need for a separate monitor. It can also be connected to a VCR or CCD camera, enabling the setup of a remote CCTV security...
Amazing All-Band Receiver
The Amazing All-Band Receiver is essentially a diode detector followed by a high-gain audio amplifier. This device is not a multi-band receiver; it captures all signals simultaneously. The detector utilizes a biased Schottky diode for superior sensitivity and bandwidth, enabling...
Wideband Active Antenna Circuit
A whip antenna measuring between 30 to 50 cm is capable of receiving signals from 10 MHz to over 220 MHz. The circuit incorporates a BF981 dual-gate MOSFET (T1), which offers low noise characteristics, high input impedance, and enhanced performance.
The...
oscillator mcpos400 plus
This is a UHF oscillator circuit designed to utilize the Mini-Circuits POS-400+ voltage-controlled oscillator chip. By applying a voltage between 0 to 12V on pin 8, it produces a sine wave output ranging from 200MHz to 380MHz on pin 2;...
rc1
An Instruction and Reference Book on Radio and Television, Coyne Electrical and Television-Radio School, 1951
This publication serves as a comprehensive instructional and reference guide focused on the principles and practices of radio and television technology as taught by the Coyne...