Single Side Band Translation Techniques for FM Data Acquisition Systems
AuthorRoth, Allen R.
AffiliationLear Siegler, Inc.
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RightsCopyright © International Foundation for Telemetering
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AbstractA Single Side Band Data Translator has been developed and used successfully with any combination of reference and data frequencies from 100 Hz to 10 MHz. This translator, consisting of a computer calculated 90° phase difference network and field effect transistor multiplier circuits yielded undesired sideband signals which were at least 50 db below the desired sideband level over an input frequency range of ten to one. The translator was used to implement a system which recorded 75 time-correlated broadband data channels on a single track of a 5 MHz rotating head tape recorder. After de-translation, a signal to noise ratio of 60 db was measured with the recorder by-passed and a signal to noise ratio of 40 db was measured with all channels recorded. This paper presents the results of research carried out under Contract No. N123(60530)51701A sponsored by U. S. Navy.
SponsorsInternational Foundation for Telemetering