The Terminal Equipment (TE) building was the location from which the SOSUS operations of the NavFac were conducted.

When the NavFac was established, a concrete block terminal building was built on top of the high dune behind the beach at Herring Point, in front of the former Coast Artillery Battery Herring, and the earthen cover was removed from that battery. 

From the TE building a cable with 40 hydrophones at its end, ran into the sea. 

From the TE Building the cable was buried underground on the top of the dune and ran to a concrete anchor at the top edge of the dune. At that point it was spliced to an armored cable which ran to the sea.  As it ran under the dune and beach it was also placed inside a split pipe for additional protection.

The cable gradually became exposed over the years as the dune was eroded.  This is how it looked in 2006-2008.

In 1962, as NavFac Cape May was closed and NavFac Lewes built, the cable was connected at sea to the former NavFac Cape May cable by the Navy cable layer USNS Neptune.  

The hydrophones  were  equally  spaced  in  the  final  1800 feet "stub" end of the cable. When low frequency sound waves struck a diaphram on the hydrophone, a coil was sympathetically caused to move generating a low voltage current. The fluctuations of that current created "signals" that represented the duration and strength of all the low frequency sounds in the sea detected by the hydrophone.  The  small currents from each hydrophone were carried back to the TE building by two insulated copper wires.  The wires from a pair of hydrophones were wrapped together into a "quad". The twenty quads for the hydrophone pairs plus a quad for the environmental sensor were carried to shore within the  "21 quad" armored cable.  

Over the course of the cable run the "21 quad" cable was protected by 4 different sizes of armor, depending on the distance from land and, therefore, the likelihood that the cable would be damaged by anchors, fishing gear or sea bottom disturbances. Type AA cable had two bands of heavy wire wrapping, Type A (see above) had one band of the same size wire wrapping, Type B had one band of smaller wire wrapping and Type D had one band of even smaller wire to protect it. Despite that protection, the cable was damaged and had to be repaired 11 times during its active service. 

As the signals moved along the cable back to the TE building, to maintain the "bandwidth" (i.e., the low frequencies of interest) which would be distorted by the capacitance created by the copper wire conductors of the cable, an impedance matching device, known as a "load coil" was spliced into each pair of conductors in the cable.  These load coils were inserted about every three miles in order to compensate for the distortion.  While each load coil by itself was rather small, due to the large number of conductors (i.e., two wires for each hydrophone; 80 wires or 40 pairs for the 40 hydrophones)   the "loading coil packages" which contained the individual loading coils were large.  Each package was on the order of 152 feet long and about 2,000 pounds in weight.  There were 37 of these huge "packages" between the hydrophones and the TE building.

When the  cable entered the TE building it went into the Equipment Room  where the weak  signals  it carried were amplified, summed and "formed" into 40 "beams". Each  beam represented the ocean sounds as if they had been detected by a "virtual" hydrophone oriented toward a different small two to five degree sector of the ocean. Thus, the 40 beams represented the sounds from a wide arc of the ocean.  These beams were further processed to eliminate signals that represented random noise and to reinforce steady signals.  They then went to a "spectrum analyzer" to eliminate signals except those in the narrow low frequency bandwidth of interest for submarine detection.

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The output of each beam was sent to a separate low frequency analyzer-recorder (LOFAR) or "gram writer".  This was a stand with a sloping face on top, over which a roll of specially electrically sensitized paper was pulled beneath an "actuator" into which the electrical signals flowed.  As the paper was continually moving forward in time, a stylus in the actuator moved across it on a frequency scale, marking the paper with a black dot to represent each signal, lighter or darker depending on the signal strength.  Thus, a constant time versus frequency versus strength graph or "lofargram" was continually being created. 

Those LOFARgrams could be interpreted by well-trained Navy Ocean Technicians to detect, from among the many random signals created by the sounds of the ocean, those strong, persistent, regular, non-environmental signals that might represent submarine noises.

If a possible non-environmental detection appeared on one LOFARgram from one 2-5 degree sector of the ocean, it was compared to grams from other sectors, analyzed for validity based on frequency, persistence, strength and other characteristics.  If it were accessed as a possible submarine, it was plotted and the position and characteristics were forwarded to the central processing facility for comparison with information from other NavFacs.

Those functions were performed by the senior NCO and officer watchstanders of the Operations Department under the supervison of the Operations Officer.

That entrance mat is all that remains of the TE building today.

The building was torn down in 2004.

The site of the TE building today.

Photo Credits

-TE Building in 2000: Courtesy of Ron Scarborough.

-Cape exposed on dune: website

-USNS Neptune: U.S. Navy photo.

-21 quad cable: website.

-LOFARgram writers: Undersea Warfare Winter 2000, vol. 7, no. 2.

-Operations Department floor mat: website, courtesy of Ms Kay Scanlon.

-TE Building wreckage: website.

-TE Building today: website.

-Illustrations of cable run on dune, of cable run to sea, of Area George, and TE Building floorplan: Department of the Navy publication NavShips 92962.

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