In-line wattmeter

Posted on Apr 6, 2012

The circuit is not frequency sensitive. Its calibration will be accurate over a wide frequency spectrum, such as the entire amateur hf spectrum, if the values of L2, the voltage divider capacitors Cl-2 and C3, and the resistances of Rl-2 are chosen properly. Rl-2 and CR1-2 should be matched for best results

In-line wattmeter
Click here to download the full size of the above Circuit.

Generally, Rl-2 must be small compared to the reactance of L2 so as to avoid any significant effect on the L2 current which is induced by the transmission line current flowing through LI. The lower frequency limit of the bridge is set by the Rl-R2/Ls ratio, and the cutoff is at the point where the value of Rl-R2becomes significant with reference to the reactance of L2 at that frequency point.

Leave Comment

characters left:

New Circuits



Popular Circuits

HANGMAN schematic
Current Dimmer for white 24 LED array
Vocal Stripper Circuit
10 w amplifier using tda2003
Flyback Power Supply Powers Subscriber Line Interface Circuit
12v to 220v converter circuit
Ultrasonic Dog Whistles
Op Amp Wien-Bridge Oscillator
Nikon IR-Remote Control
LA5522 Application Circuit