Development of the Antenna (Identification) Mark 18 Mod 0
Abstract
The Mark 18 Antenna is a lobing array for use with Radar Equipments Mark 32 Mod 1 installed in the Mark 37 Director with Fire Control Radar Mark 25 Mod 2. While the array itself is essentially the same as one described in an earlier report (R-2791), it has been modified for mounting on the director face. Satisfactory coverage in the vertical plane has been obtained by elevating the antenna 25 degrees with respect to the deck. The horizontal beam width now ranges between 36 and 40 degrees, the main crossover lies between 2.3 and 3.5 db, and all spurious crossovers are at least 16 db down from the maximum response over the 157-175 Mc band. The train error is less than 2 degrees at elevation angles up to 80 degrees, and less than 3 degrees at the 20 degree extremes of cross-level. The standing wave ratio does not exceed 3.5 db with the beam deflected in either position.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1946
- Accession Number
- AD1202504
Entities
People
- P. A. Lantz
- R. J. Adams
Organizations
- United States Naval Research Laboratory