Comparison of Performance of an CRD-2 DAU and FH 4 Radio Direction Finders
Abstract
Comparison is made of the performance of the AN/CRD-2 an Army Signal Corp Type of radio direction finder employing an electronic goniometer with a Navy Model DAU using a mechanically rotating goniometer and British FHB instantaneous direction finder of the Watson-Watt type. Tests indicate that the Model DAU possessed the greatest bearing sensitivity, the FH4, the lowest instrumental error as well as the greatest effectiveness against pulsed signals with the DAU ranking second in this particular. The chief advantage of the AN/CRD-2 appears to lie in the absence of any mechanically rotating parts such as used in the DAU and of difficult maintenance alignment (such as is required with the FH 4) but this apparent advantage is questionable in view of the use of balanced modulator input circuits which lack stability and requires the matching tubes. The FH4 is a direct reading cathode ray direction finder designed for use on board surface vessels. The DAU is a mechanically rotated gonimeter radio direction finder designed to take bearings on the frequency range of 1.5.-30 Mc. in four bands.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1946
- Accession Number
- AD1202700
Entities
People
- Earl H Jr Flath
- Willard C Meilander
Organizations
- United States Naval Research Laboratory