Naval Computer And Telecommunications Area Master Station Pacific (NCTAMSPAC) Det Puget Sound

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

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Station Composition

• 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

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VLF Transmitter System

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Console
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Tank Circuit
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(No Transcript)
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(No Transcript)
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Helix House
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ANTENNA SYSTEM

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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

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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.