vhf radio repeater circuit | Next Electronics

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,...

Shorty Forty Antenna

City dwellers and other flat dwellers know the practical difficulties they encounter when they try to put up an antenna for 40 meters. Finding space enough to accommodate 67 feet of wire is a real problem for them and most...

VHF FM Transmitter MAX2606

To achieve independence from local radio stations when testing VHF receivers, a frequency-modulated oscillator is required that operates within the range of 89.5 to 108 MHz. However, constructing such an oscillator using discrete components can be quite challenging. Maxim has...

Radio circuits built

This receiver is a modification of Charles Wenzel's Two Transistor Reflex Radio. Instead of a ferrite AM loopstick antenna, a magnetic loop antenna is used, and an LM386 amplifier stage has been added to drive an 8-ohm speaker. A switch...

300W FM RF Amplifier Circuit

This 300W RF power amplifier for an FM transmitter utilizes 2 x TP9383 transistors. It operates within the 88 - 108 MHz frequency band. The 300W RF power amplifier is designed specifically for FM transmission applications, providing high power output suitable...

80 Watt stereo transmitter

This transmitter was designed from the ground up to provide very high sound quality, coupled with excellent frequency stability, reliability, etc. It can be used as a standalone transmitter to serve a medium-sized town, or as an exciter to drive...

Vhf-modulator

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...

VHF TV Signal Amplifier

Many times we needed to strengthen a small signal in the region of VHF or FM. The preamplifier that we propose offers 20dB in all the region of VHF and it still can reach also their 500MHz. The amplifier is...

5W 7Mhz Rf Power Amplifier Circuit

The circuit illustrated is designed to generate up to 5 watts of RF output in the 40-meter (7 MHz) amateur band. The coils depicted are wound on toroidal cores from Armdon Associates Inc., with part numbers provided in the schematic....