INSTRUMENTATION FOR RECEIVING ELECTROMAGNETIC NOISE BELOW 3000 CPS

• Main Author: LOKKEN,J. E.
• Other Authors: PACIFIC NAVAL LAB ESQUIMALT (BRITISH COLUMBIA)
• Format: Text
• Language: English
• Published: 1964
• Subjects: *RADIO INTERFERENCE; ELECTRONIC RECORDING SYSTEMS; ATMOSPHERICS; EXTREMELY LOW FREQUENCY; ELECTROMAGNETIC RADIATION; NOISE(RADIO); MAGNETOMETERS; RADIO RECEIVERS; GEOPHYSICS; ARCTIC REGIONS; Arctic; Schumann
• Online Access: http://www.dtic.mil/docs/citations/AD0613379; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0613379

The frequency range studied is divided into three bands: the micropulsation band, which extends up to approximately 5 cps and uses quasi-DC receiving systems; the low ELF or Schumann band between approximately 2 cps and the power-line frequency of 50 or 60 cps; and the band which commences at as low a frequency as is consistent with interference from the power line and its harmonics and extends up to a few tens of kilocycles. Each of these bands appears to have its own characteristics as far as spectral level, noise characteristics and siting problems are concerned, and the paper has been divided accordingly. Instrumentation is discussed in detail, and some general factors influencing the design and siting of equipment are reviewed. Pub. in mono. Natural Electromagnetic Phenomena Below 30kc/s 1964, p373-428 (Copies not available to DDC or Clearinghouse customers).