NDLI: The Status of Frequency Standardization

Content Provider	IEEE Xplore Digital Library
Author	Dellinger, J.H.
Copyright Year	1913
Abstract	The measurement of frequency, hitherto of laboratory interest only, has become of first-rank importance in reducing radio interference. This has come about through the increasing use of all available radio channels particularly at broadcasting and higher frequencies. While an accuracy of one half per cent was satisfactory five years ago, accuracies a thousand times as good are now sought. The piezo oscillator is meeting the needs of this situation in large part. Much effort is being devoted to making the piezo oscillator as constant as possible. Commercially available piezo oscillators, without temperature control, are generally reliable to about 0.03 per cent, just barely enough to meet the Federal Radio Commission's requirement of one-half kilocycle. In order to reach greater accuracy, considerable work is being done on the primary standards of frequency, to insure the highest constancy and accuracy. The Bureau of Standards and other organizations are engaged on a cooperative program to attain an accuracy of 0.001 per cent. Comparisons with other nations show that the national laboratories of the larger countries are already in agreement to about 0.003 per cent. Temperature controlled piezo oscillators will probably allow the holding of station frequencies so close that several stations can broadcast on the same frequency without heterodyne interference. Use of these or equivalent devices is vital to the maximum utilization of the very high frequencies; the separation of 0.
Starting Page	579
Ending Page	590
Page Count	12
File Size	1181564
File Format	PDF
ISSN	07315996
Volume Number	16
Issue Number	5
Language	English
Publisher Date	1928-05-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Standardization Oscillators Frequency measurement Circuits Measurement standards Laboratories Radio broadcasting Temperature control Electromagnetic interference Standards organizations
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Radio Frequency Interference Measurements and Standards

Method and Apparatus Used at the Bureau of Standards in Testing Piezo Oscillators for Broadcast Stations

Adjustment of High-Precision Frequency and Time Standards

Accurate Method of Measuring Transmitted Wave Frequencies at 5000 and 20,000 Kilocycles per Second

Standard Frequency Dissemination

A review of electromagnetic compatibility/interference measurement methodologies

Radio-frequency standardization activities

Evolution of Regulatory Standards of Interference

Standard frequency and time notices

The Status of Frequency Standardization

Similar Documents

Radio Frequency Interference Measurements and Standards

Method and Apparatus Used at the Bureau of Standards in Testing Piezo Oscillators for Broadcast Stations

Adjustment of High-Precision Frequency and Time Standards

Accurate Method of Measuring Transmitted Wave Frequencies at 5000 and 20,000 Kilocycles per Second

Standard Frequency Dissemination

A review of electromagnetic compatibility/interference measurement methodologies

Radio-frequency standardization activities

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The Status of Frequency Standardization