A SYSTEM FOR RECORDING ELECTROMAGNETIC ATMOSPHERIC NOISE IN 3-50 CPS REGION
NEW MEXICO UNIV ALBUQUERQUE ENGINEERING EXPERIMENT STATION
Pagination or Media Count:
Instrumentation was developed to secure noise data in the 3 to 50 cps portion of the spectrum and, at the same time, to seek evidence of the Schumann frequencies in this region. A frequency translation technique is employed during recording. During playback, the data is again translated and restored to its normal position in the spectrum. A test signal is used to ensure that in the record mode the gain is maintained within 1.2 db. Under this restriction, test tapes recorded at frequencies in the 3 to 50 cps range indicate the gain from the antenna input during record to the receiver output during playback. The over-all response in this frequency range is the response of the receiver, i.e., within 3 db.
- Radiofrequency Wave Propagation