Naval Radio Station (T) Jim Creek

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Presentation transcript:

Naval Radio Station (T) Jim Creek Naval Computer And Telecommunications Area Master Station Pacific (NCTAMSPAC) Det Puget Sound Naval Radio Station (T) Jim Creek 1

BACKGROUND ADM Carney, CNO, directed Site survey - 1946 Construction began – 1949 (RCA Contract) First Keyed – 1952, First Broadcast – 1953 Commissioned 18 November 1953 Reputation as the “most reliable VLF site” 99.99% on-the-air efficiency rate. 9 modifications to keep updated. (Value Project 2001) Goal of Value Project to extend life - 2030 DOD civilian technicians have maintained and operated the transmitter since 1972.

Station Composition Emergency Power Generator Station 4,899 total acres 40 acres improved for Station use 980 acres antenna ground field 47 miles service roads and fire trails, only 4 miles are paved 70 buildings/structures 4 lakes 4 Housing units Fish Hatchery (Coho Salmon) cooperation with the Stillaguamish Tribe Emergency Power Generator Station VLF Transmitter Antenna System

VLF Transmitter System

Console

Tank Circuit

Helix House

ANTENNA SYSTEM

ANTENNA SYSTEM Components: Two catenary arrays with five spans on each side. Antenna located between Two 2700 foot mountains Covers 1 sq mile with 10 miles of suspended cable 35 - Towers total: 12 - Main 200 ft. Towers 13 - Buss towers 10 pull off towers. 10 miles of aerial cable spans. Longest span – 8800 ft Shortest span - 5400 ft 3 spans replaced – 1988/89 2 spans replaced - 2001

ANTENNA SYSTEM Components: Antenna spans designed to handle 1-2” of radial ice and winds up to 65KTs (approximately 75 mph) 980 acre ground field 587 cleared acres Over 360 miles of copper cable conductors make up the ground grid.