Acceptability Tests of Model F-26/UPR Wave Trap
Abstract
This report describes the electrical and physical tests, which were applied to the F-26/UPR wave trap to determine its acceptability for Naval use. The F-26/UPR wave trap was designed for use with either the AN/SPR-2 or the AN/APR-5AX receiver, for the primary purpose of determining the fundamental frequency of the received signal. The device may be used as a rejection filter to attenuate the signals of nearby radars and transmitters in the frequency range of 1000 to 6000 megacycles per second. As a rejection filter it may be used as a tuned attenuator capable of a maximum attenuation varying from about 33 decibels at 6000 megacycles per second to approximately 50 decibels at 1000 megacycles per second. The accuracy of the device as a frequency meter is under 3 percent but the time and signal conditions necessary for a successful measurement are such as to render the device practically valueless in service against enemy radar or guided missiles. A method for setting the initial calibration for the wave trap is described. The attenuation characteristics of the unit arc presented with conclusions and recommendations concerning the use of this type of a device as a frequency measuring instrument. The trap employs a tuneable shorted coaxial stub connected across the signal cable to a receiver. When tuned to resonance, the stub is some integral number of half waves in electrical length and thus it effectively short- circuits the signal cable, attenuating the input to the receiver.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 25, 1946
- Accession Number
- AD1199695
Entities
People
- H. K. Weidemann
Organizations
- United States Naval Research Laboratory