VHF-FM-supplement.asp circuit

This compact transmitter is suitable for less demanding Doppler propagation measurements. It is designed for operation on the 80m band but can be easily adapted for the 40m or 20m bands. The output power is approximately 500mW of unmodulated carrier,...

Optimized 6/9 element VHF Yagi Antenna

The computer optimized 9 el. homebrew antenna is performing very well. I have made many long distance contacts using the ON6MU VHF Yagi antenna. I have the antenna located only 35 feet above the ground. More: The very first day...

14W CW TRANSMITTER

A low-power two-stage FET transmitter designed for the 80-meter amateur band utilizes a Pierce crystal oscillator that does not require an output resonant circuit. A DC milliammeter can be connected across a 150-ohm resistor in the gate circuit of the...

large signal approach yields low noise vhfuhf oscillators

Unlike conventional small-signal methods, employing large-signal, time-domain design techniques facilitates the development of low-noise grounded-base oscillators suitable for VHF/UHF applications. The implementation of large-signal, time-domain design techniques in the creation of grounded-base oscillators represents a significant advancement in the field of...

Superlinear FM (Frequency Modulator)

Designing various electronic circuit systems (synthesizer, modem, decoder, data converter, etc.) often requires a frequency modulator subsystem. An FM modulator is a crucial component in these systems. An FM modulator is an electronic device that encodes information in a carrier wave...

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...

Receiver Audio Circuit

This simple receiver AF amplifier can supply several hundred milliwatts to an 8-ohm speaker. The gain is approximately 200X. If high gain is not required, C2 can be removed, resulting in a gain of 20. R1 and C6 are essential...

Receiver/Scanner Preamp Circuit

The low-cost Mini-Circuits MAR-X series of chips provides a significant advantage for RF builders, featuring inherent 50-ohm input and output impedances essential for RF systems. An MAR-1-based receiver/scanner preamplifier is illustrated. Capacitors Ci and C2 are chip capacitors, with values...

the design of the intellectual wireless signal transducer of ARM

The intellectual wireless signal transducer is designed for major transducer applications and typical sensor output signal designs. It is essential to first analyze the outgoing signals from the transducer. Typically, the output of the transducer is a standard electric current...