HETERODYNE FREQUENCY METER


Posted on Feb 4, 2014

Circuit consists of 1-2 MHz oscillator Q1, untuned mixer X1, and AF beat-note amplifier Q2. C4 is calibrated to read directly in frequency from 1 to 2 MHz, using accurate unmodulated RF signalgenerator. After calibration, unknown RF signal input frequency is fed into meter for zero-beating with harmonics of calibrated oscillator. Magnetic headphone


HETERODYNE FREQUENCY METER
Click here to download the full size of the above Circuit.

s plugged into J1 make beat note audible. On second harmonic, dial of C4 covers 2-4 MHz; on twentieth harmonic, coverage is 20-. 40 MHz. L1 is 65 tums No. 28 enamel on 1-inch form, tapped 20 tums from ground. L2 is 10 tums No. 28 enamel closewound around center of L1. -R. P. Turner, "FET Circuits, " Howard W. Sams, Indianapolis, IN, 1977, 2nd Ed. , p 144-146.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

GP display controller
2x30W audio amplifier (STK465)
Frequency counter up to 1MHZ
Dual voltage power supply 12 volts
TL072 op-amp configured as voltage comparator
Data Logger with Serial Interface
Battery Backup for SRAM or Microcontroller
galaxi digicolor 26 chassis ittsel
hacking rfid for fun
Car Amplifier Circuit Schematic using TDA2040 Integrated Audio Amplifier
Pulsed-light sensor
Range precision voltmeter circuit



Top