Portable Precision Frequency Meter
Abstract
The portable frequency meter proposed in this report measures any frequency in the range of 5 Mc to 1407 Mc to an accuracy within three parts per million, 0.0003 percent. This self-contained frequency meter provides a stable comparison frequency of known calibration which is compared with the unknown frequency through a crystal mixer, video amplifier type receiver, and the unknown is identified by the use of the associated filter and indicator circuits. The stable oscillator is positioned by an automatic frequency control loop consisting primarily of a direct reading, four decade frequency divider, a phase discriminator, a reactance tube, and a temperature controlled crystal oscillator which provides a very stable control frequency at the phase discriminator. Frequency change of the positioned oscillator is made by switching of the four decade divider controls. The proposed frequency meter will require no external calibration curves or tables, but will present the frequency reading on the front panel in the form of a very simple frequency equation. Operation of the meter will be simple and direct.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 06, 1949
- Accession Number
- ADA457218
Entities
People
- G. K. Jensen
- James E. Mcgeogh
Organizations
- United States Naval Research Laboratory