VSWR Indicator for the Fuchs Circuit

All ATL-3 loop windings are center-tapped and balanced with respect to their amplifier/receiver chassis ground, which leads to self-cancellation of electric field interference. Magnetic noise fields, such as those from televisions and electric meter boxes, or electromagnetically radiated interferences, can...

Radio Glen Transmitter

This document describes the transmitter system supplied to Radio Glen for testing as designed and constructed by Henry. The transmitter is supplied in prototype form and has the physical limitations of an instrument constructed using prototyping techniques. The transmitter has...

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...

valved transmitter for 3.5 MHz

This transmitter project is a highly efficient, rugged, and simple low-power continuous wave (C.W.) unit delivering more than 10W. It is crystal-controlled with stabilized high tension (H.T.) and features a buffer stage between the crystal oscillator and power amplifier stages,...

Four Foot Box Loop Antenna

Please find attached your copy of my four foot unamplified box loop. It will tune from 525 kHz to about 1710 kHz covering the entire Broadcast Band. The umbrella stand described in the article is the type you would use...

Circuit diagramms of the 144 SBB/RX - Receiver

To comprehend the interconnections between the following circuits, it is essential to first review the concept chapter. It is at the discretion of the user to select one or two of these circuits for personal development. The discussion begins with...

ATV JR TRANSMITTER 440 MHz

This low-power video transmitter is suitable for remote control applications, surveillance, or amateur radio. It employs seven transistors within a crystal oscillator multiplier RF power amplifier chain, along with a high-level video modulator. A supply voltage ranging from 9 to...

FM voice transmitter for Band 2 VHF

This compact transmitter employs a Hartley oscillator configuration. Typically, the capacitor in the tank circuit connects to the base of the transistor; however, at VHF frequencies, the base-emitter capacitance of the transistor behaves like a short circuit, maintaining its functionality....

Antenna tunning circuit for 27MHz CB band

The antenna tuning circuit can accommodate 1/2 wave length antennas or higher, for input resistances of 50 Ohms which make it suitable for CB (Citizen Band) transceivers. C1 is for fine tuning and C2 is just for tuning. Turning C3...