AN IMPROVED BROADBAND, LOW-LOSS TRANSMISSION LINE SYSTEM TO BE INSTALLED WITHIN A RETRACTABLE SUBMARINE MAST
AIRTRON INC MORRIS PLAINS NJ
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The second interim phase of the contract to develop an improved transmission line system for use in the ECM mast of a submarine is presented. An end fire version of the ALB-134-to-coaxial transition previously developed is being designed for use at the top of the mast where the connection is made to the antenna. The high band 50 ohm pressure window mock-up was assembled and tested. The maximum VSWR obtained over the high frequency band is 1.40. A larger 70 ohm version of this window was built and tested for use over the low band. Its maximum VSWR from 2.0 to 5.0 Gcs was 1.20. However, the high band mock-up was also tested over this range, and its maximum VSWR was 1.36. Therefore, the use of two separate window designs to cover the two bands will be avoided by using the small version over both frequency bands. The movable mast design approach was changed from the fixed two-position scheme to a continuously operating system useable over a six foot range of elevation. Considerable mechanical design work is required to accomplish this, and preliminary work is underway.
- Electrical and Electronic Equipment