PHASE_MEASURING_AT_30_MC

Published:2009/7/20 4:19:00 Author:Jessie | From:SeekIC

Double mixing process linearly transposes phase shifts accumulated at 30 Mc down to 2 Mc, where they are accurately compared against calibrated 2-Mc reference signal. Samples of 30-Mc and 2-Mc signals are mixed in V5, and 32-Mc sum frequency is then mixed with phase-shifted 30-Mc signal from unit under test by V6. Difference frequency, equal to 2 Mc plus phase shift, is amplified in V7A, fed through gate V7B, and associated circuits then superimpose this signal and that of 2-Mc reference oscillator on cro to get display of phase shift.-A. Nirenburg, How to Measure Midfrequency Phase Shift, Electronics, 31:35, p 46-47.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Control_Circuit/PHASE_MEASURING_AT_30_MC.html

Print this Page | Comments | Reading(3)