An FSK (Frequency Shift Keying) Telemetry Module for Vector Measuring Current Meters.

Abstract

The EG&G Vector Measuring Current Meter (VMCM) used in mooring work provides a 20 ma Serial ASCII Instrumentation Loop (SAIL) communication system. A projected application of the VMCM is to have a surface mooring communicate with a series of VMCMs via a Frequency Shift Keying (FSK) link. While an FSK modem can communicate with the VMCM, a problem exists with the general operation of the VMCM. If the VMCM is addressed to dump data, it remains on until the unit is re-addressed. If a failure in the link occurs, then the VMCM stays on in a higher power mode and the batteries will be depleted early. The insertion of a processing block between the modem and the VMCM providers a way to look at incoming data, qualify it and re-transmit it to the VMCM. The VMCM will reply and the preprocessor can channel the data to the modem. In the event of a VMCM malfunction, the preprocessor has a timeout function and will turn off the carrier keeping the line quiet.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1987
Accession Number
ADA192142

Entities

People

  • James R. Valdes
  • Paul D. Fucile

Organizations

  • Woods Hole Oceanographic Institution

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Accumulators
  • Communication Systems
  • Computers
  • Ecology
  • Frequency
  • Frequency Shift
  • Instructions
  • Npn Transistors
  • Oceanography
  • Power Supplies
  • Resistance
  • Semiconductors
  • Signal Generators
  • Terminals
  • Transistors
  • United States
  • United States Government

Fields of Study

  • Engineering

Readers

  • Aerospace Test and Evaluation
  • Oceanography.
  • Radio communications and signal processing.