Servo Systems for Rapidly Scanned Countermeasures Receivers
Abstract
Improved methods have been developed for servo control of rapidly scanned countermeasures receivers. This progress is part of the program for obtaining high signal intercept probability by use of a high- resolution high sensitivity super heterodyne scanned through the tuning range at a rate of 1000 megacycles per second per second. For receivers operated from a 400-cps source, such as the AN/APR-9, a 4.5-kc carrier system replaces the dc amplifiers previously used with hysteresis-type magnetic clutches. For receivers operated from a 60-cps source, such as the AN/BLR-1 and AN/SLR-2, recently developed two-phase motors have acceleration capabilities adequate to provide scanning control. Indications are that two-phase motors with the proper characteristics could be produce for 400-cps operation. Sector sweep is now accomplished by direct change in reference voltage based on thyratron ignition points. Calibrated frequency of intercepted signals is obtained from a Veeder-Root counter which is also servo controlled.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 25, 1955
- Accession Number
- AD1223136
Entities
People
- John H. Markell
Organizations
- United States Naval Research Laboratory