1. 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

2. BACKGROUND ADM Carney, CNO, directed Site survey - 1946
Construction began – (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
DOD civilian technicians have maintained and operated the transmitter since 1972.

3. 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

4. VLF Transmitter System

5. Console

6. Tank Circuit

9. Helix House

10. ANTENNA SYSTEM

11. 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 ft
3 spans replaced – 1988/89
2 spans replaced

12. 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.