Reduction of Instrumental Error in Model Dab Direction Finding Equipment
Abstract
Instrumental error in the Model DAB direction finder equipment, observed most readily by a difference in bearing on two adjacent bands at the same frequency and amounting to as much as four or five degrees, have been dealt with in this report and a method proposed whereby these errors can be reduced to the point of their becoming practically negligible in normal equipment operation. The proposed correction provides for an increase in symmetry and the reduction of undesirable pickup in the two loop collector systems by shielding the upper loop tracking units and revising certain wiring to the trimmer capacitors in one of these units. The appendices include a list of the items necessary to incorporate the proposed correction in the equipment, together with photographs and manufacturing drawings to permit their procurement and assembly into a "kit" and also instructions for use by station personnel in effecting the modification of the DAB equipments.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 28, 1945
- Accession Number
- AD1193902
Entities
People
- A G Jr Loveberg
Organizations
- United States Naval Research Laboratory