Three repeater huts in the Concord Area

This hut is located several hundred feet off the road oposite the rear gate to Hanscom AFB.
It is unusual in that the repeaters are above grade and in the hut.  The hut is close to 20 feet deep
which is about the size of a below grade repeater vault. Generator plug can be seen on the right hand
side of the building.
 

Electrical circuits for hut.  Even though it is a 60 amp service, there is only one pair of 110 VAC outlets and an interior and exterior light.  The building even has a receptical for an external portable generator.  Generatoroutlets were provided in the lates 70's to save on AC power bills.  Note the roof is poured concrete.  The exterior wooden roof is just for looks.  L-3 repeaters werehung from the ceiling on 7 foot bays.  the equipment inculded 1 line amp and 1 regulator for each direction.  Power for the repeaters were supplied by High Voltage AC on the center conductor of the coaxial cable.  The voltage drop at each hut was 230 VAC resulting in a supply voltage in the thousands of volts at the Main Station on long routes.
 

The coaxial cable is cut off at the floor level.  A third copper cable (25 pair) is on the left.
The copper cable appears to run alonside of coaxial cable for order wire connections.

Note the wall thickness.  Each wall is 2 rows of concrete black with
a layer of concrete sandwiched between.  These huts were not considered "blast hardened",
which  makes sense as the Boston office was not expected to survive Armageddon.
 

A second repeater hut 4 miles west in Corcord.  Note AT&T sign in front.  Currently being
rented from AT&T for storage by a local resident.

Mini marker next to Concord repeater hut.  This pole is only 4 feet tall!
Note pressurization fitting on side.

Repeater hut in downtown Lexington, MA.  Just in front and to the right is a small
vault that was installed in the mid 80's for transistorized repeaters.