Topside Intermodulation Interference Aboard USS MOUNT WHITNEY (LCC 20), USS BLUE RIDGE (LCC 19), and USS IWO JIMA (LPH 2)
Abstract
The results of measurements of intermodulation (IM) interference taken aboard USS MOUNT WHITNEY, USS BLUE RIDGE, and USS IWO JIMA are presented. In addition, the results of laboratory tests of connectors that were interference sources aboard BLUE RIDGE are reported. IM interference levels measured aboard MOUNT WHITNEY were determined to be lower than those aboard USS FOX (DLG 33), which was previously considered to have the lowest topside- generated rfi levels among active Fleet warships. Interference levels at hf and vhf on BLUE RIDGE were found to be higher than MOUNT whitney levels but still lower than those on FOX. UHF IM interference measurements taken aboard BLUE RIDGE indicated serious sources of interference in PHASOR 90 transmitting systems. Substituting connectors not having nonlinear material for the Prodelin cable connectors and in the PHASOR 90 power divider was proposed as a corrective measure. By applying new measurement techniques, important sources of topside- generated interference were located and identified aboard IWO JIMA. A plan of minimum topside rfi control measures for LPH-class ships was devised which, while not reducing levels to those of FOX, will effect a major improvement at minimum cost.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 27, 1972
- Accession Number
- AD0908504
Entities
People
- G. C. Salisbury
Organizations
- Navy Electronics Laboratory