VHF Beam circuit | Next Electronics

This circuit utilizes an oscillator (2N2222) and a diode (D1) as a nonlinear mixer. The frequency is determined by a slug in inductor (L1). Additionally, RFCl, C1, and RFC2 create a low-pass filter that allows video signals to pass while...

Transmitter Servicing Course

With the equipment ready for operation, the main line switch (S-831), the emergency switch (S-12), and the main line contactor contacts (K-831B) are all closed. The keying relay main contacts (K-1C) ground the center tap of the MO filament secondary...

MAX2606 VHF FM Transmitter

To test VHF receivers independently from local radio stations, a frequency-modulated oscillator is required, covering the range of 89.5 to 108 MHz. Building such an oscillator with discrete components is challenging. The MAX260x series from Maxim offers five integrated oscillator...

Simple Rf Test Oscillator Circuit

A simple oscillator for intermediate frequency (IF) alignment at 455 kHz can be useful in field testing or in scenarios where a standard signal generator is available. The inductor (L1) should resonate at the desired output frequency with the series...

2 Watt VHF linear amplifier

Once again my collection of projects creation has been interrupted by another necessity. Patrick and other people have asked me for a circuit of a VHF power amplifier. These circuits are my "standard" building blocks that can be used to...

RF Actuated Keying Monitor

Sending Morse on a rig without a sidetone is not impossible, but is not particularly pleasant either. This battery-powered monitor has been designed to provide an audible indication of keying for those whose rigs lack a CW sidetone. Its sensor...

Camera VHF Video Transmitter

This is a simple video transmitter capable of transmitting signals up to 50 meters. It can be utilized with cameras or other video sources and allows viewing on VHF channel analog televisions. The video transmitter operates on a supply voltage...

egan fet silicon power shoot out volume 10 high frequency resonant converters

Distributed power systems are commonly used in telecommunications, networking, and high-end server applications, utilizing a 48 V bus voltage derived from the telecom industry. This 48 V bus supplies several isolated point-of-load (POL) converters that power the end loads, with...

High Frequency Colpitts Crystal Oscillator

Op-amps have been widely used in low-frequency oscillators. Op-amps, or operational amplifiers, are versatile components frequently utilized in the design of low-frequency oscillators. These devices are capable of generating periodic waveforms, such as sine, square, or triangular waves, which are essential...