QRP Antenna Tuner


Posted on Nov 19, 2012

This circuit is for a QRP (low power) antenna tuner, a.k.a. a transmatch, for use in the short wave amateur radio bands from 3-30 Mhz. It allows a wide variety of antennas to be connected to a low power transmitter. When the circuit is properly tuned, the maximum transmitter power will be delivered to the antenna. It is used in conjunction with a standing wave ratio (SWR) meter. This is a fairly generic antenna tuner circuit.


QRP Antenna Tuner
Click here to download the full size of the above Circuit.

The purpose of a transmatch is to match the impedance of a transmitter, typically 50 ohms, to an unknown antenna impedance. The circuit consists of a variable series inductor followed by a variable capacitor to ground. Most transmitter outputs consist of




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Fixed-Current Regulator
rear wheel tachometer
mixer and vu meter
Audio Oscillators
Wien Bridge Oscillator
OSCILLOSCOPE COUNTER PREAMPLIFIER
SENSITIVE RF VOLTMETER
Having 50 input output impedance wideband video amplifier OPA676 circuit



Top