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HEWLETT-PACKARD JOURNAL T E C H N I C A L I N F O R M A T I O N F R O M T H E - d p - L A B O R A T O R I E S Vol. 15, No. 8 PUBLISHED BY THE HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA APRIL, 1964 A New Instrument for Measuring Microwave Frequencies with Counter Accuracy JU OR SEVERAL years now, it has been possible to mea monies zero-beats with the unknown microwave signal sure VHF Signals accurately with electronic counters. and the VHF oscillator frequency is measured with the These measurements are made by converting a high counter. The frequency of the unknown signal then is frequency to a related lower frequency, generally by calculated after determining which harmonic causes heterodyning the measured signal with a harmonic of the zero-beat. This technique enables measurements the counter's time base oscillator to derive a suitable of frequencies up to 40 Gc with an accuracy approach difference frequency1. ing 1 part in 107. For measurements of higher frequencies, a transfer More recently, significantly better accuracies have oscillator customarily is used with a counter^. The been obtained by using a synchronizer with the transfer VHF transfer oscillator is tuned until one of its har- oscillator3. The synchronizer slaves the transfer oscil lator to a sub-multiple of the unknown signal with 1 "A New Frequency Counter Plug-In Unit for Direct Frequency Measurements to 510 Me;1 Hewlett-Packard Journal, Vol. 12, No. 5, January, 1961. ! Albert Benjaminson, "An Instrument for Automatically Measur ! Dexter Hartke, "A Simple Precision System for Measuring CW ing Frequencies from 200 Me to 12.4 Gc" Hewlett-Packard Jour and Pulsed Frequencies up to 12,400 Mc|' Hewlett-Packard Jour nal, Vol. 13, No. 3-4, Nov.-Dec., 1961. nal, Vol. 6, No. 12, August, 1955. SEE ALSO: