US Army Signal Corps
Telephone equipment

 


Telephone equipment

Telephones Telephone Switchboards Central Office Sets Test Equipment
EE-8
EE-91
EE-92
EE-93
TP-3
TP-6
TP-9
BD-9
BD-11
BD-14
BD-71
BD-72
SB-5
TC-1
TC-2
TC-4
TC-5
TC-10
TC-12
TC-20
BE-70

Telephones


EE-8

Field telephone; weight 9.5 lbs; local battery; leather or canvas carrying case, ringer; hand generator, ringing range 3000-ohm line with leakage resistance of 1000 ohms, 2000 ohms on lines equipped with two repeating coils C-161; holding bridge provides signalling to common battery switchboards; antisidetone circuit; handset TS-9-( ); transmitter current supplied by two batteries BA-30 on connection to either magneto or common battery boards. 

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EE-91

Wall mounted telephone box; common battery; ringer; hand generator for signalling magneto lines; antisidetone circuit; Handset TS-12-( ) used with but not part of EE-91; transmitter current obtained from central office battery.


EE-92

Telephone box EE-91 mounted in wooden box for outdoor use.


EE-93

Telephone box EE-91 mounted in metal box for outdoor use.


TP-3

Field telephone; weight 8 lbs; leather or canvas carrying case; sound powered handset TS-10-( ); ringer; generator for signalling magneto switchboards. Used where conditions make batteryless operation necessary.


TP-6

Combined hand telephone set; weight 6 lbs; common battery; ringer; dial (optional); antisidetone circuit.


TP-9

Portable telephone equipped with transmitting and receiving amplifier for increasing operating range. Transmission is in one direction at a time controlled by a push to talk switch in handset handle. Uses one battery BA-27, one BA-65 and three BA-2

tp9.jpg (51609 bytes)

Telephone Switchboards


BD-9

Switchboard, single position, 4 lines.
Field or camp monocord switchboard with fibre carrying case. Telephone EE-8, ordered separately, is used for operator set, and for ringing on lines. Trunks to other switchboards must be of ringdown type. Night alarm bells or Buzzer operating on two Batteries BA-23, mounted externally and ordered separately. Two switchboards BD-9 can be used together to double capacity.
Replaced by SB-5


BD-11

Switchboard, single position, 12 lines.
Same as switchboard BD-9 in general design and features except more lines provided.
Replaced by BD-72


BD-14

Switchboard, single position, 40 lines.
Field or camp magneto switchboard, portable, self enclosing trunk style, not requiring packing case. Total weight about 185 pounds, packed. Telescopic legs. Can be used for temporary or semi-permanent installation. Cord circuits are ring-thru type with one ring-off or rering drop; rings or both cords. Trunk to other switchboards must be of ringdown type.
Replaced by TC-4.


BD-71

Switchboard, single position, 6 lines.
Field or camp monocord switchboard, cabinet style, self-enclosing, with handles and carrying strap; not requiring packing case. Telescopic legs. Total weight about 48 pounds, packed. Equipment is accessible from front, top and rear of cabinet. Line drop acts as ring-off or rering drop. A lamp on each side of switchboard furnishes illumination for night operation. Lower half of front acts as writing shelf and has a sheet of white pyrolin erasable writing surface for diagrams or other data. Trunks to other switchboards must be of the ringdown type. Simplex coils provided on two line units for telegraph or phantom use.
Two switchboards BD-71 can be used together to double capacity. Spark gaps provided on lines. Includes hand generator for ringing.

bd71.jpg (78571 bytes)

BD-72

Switchboard, single position, 12 lines.
Same as switchboard BD-71 in general design and features except more lines are provided and simplex coils are provided in four line units for telegraph or phantom use. Total weight about 72 pounds, packed.

bd72.jpg (63023 bytes)

SB-5

Switchboard, single position, 6 lines.
Field or camp monocord switchboard with case and moisture proof bag BG-169. Weight about 11,5 pounds, packed. Telephone EE-8 (not part of) is used for operator's set and for ringing on lines


Central Office Sets


TC-1

Switchboard, multiple position, 30 lines per position.
Army or other headquarter complete transportable multiple type magneto and common battery central office.
Replaced by TC-20

Components:
BD-80 switchboard
BE-70-F test cabinet
BD-90 Power Panel
BE-75 AC Power distr. Cabinet
BE-72 DC Power & test cabinet
RA-36 Rectifier
FM-19 Protection Panel
ME-4 Maintenance equipment


TC-2

Switchboard, single position, 20 lines per position.
Army corps, or other headquarters complete transportable single position magneto and common battery central office set shipped in trunk type carrying cases. Main component is Switchboard BD-89 which is a two-panel nonmultiple position. 

Components:
BD-89 switchboard
BE-70-B test cabinet
BD-98 Power Panel
RA-36 Rectifier
BE-79 Protection Panel
ME-6 Maintenance equipment


TC-4

Switchboard, single position, 40 lines per position.
Division or other headquarter non-multiple magneto central office of which switchboard  BD-96 is the main component and which is a portable single position.

Components:
BD-96 switchboard
BD-97 Protection Panel
ME-11 Maintenance equipment

bd91.jpg (53132 bytes)

TC-5

Switchboard, multiple position.
Consists of the additional equipment necessary to make two Telephone Central Office Sets from a single Telephone Central Office sets TC-1 or TC-10, or three sets from two. Particularly useful in moving a central office set from one location to another, placing one or two positions in service at the new location while keeping the remainder working at the old location.
Replaced by AN/GTA-1

Components:
BD-90 Power Panel
BE-75 AC power distr. cabinet
BE-72 DC power & test cabinet


TC-10

Switchboard, multiple position, 30 lines per position.
Army or other headquarter complete transportable multiple type magneto and common battery central office set in which the three switchboards BD-110 differ from the switchboards BD-80 in being trunk type with handles and which requires no packing case.
Replaced by TC-20

Components:
BD-110 switchboard
BE-70 test cabinet
BD-90 Power Panel
BE-75 AC Power distr. Cabinet
BE-72 DC Power & test Cabinet
RA-36 Rectifier


TC-12

Switchboard, single position, 20 lines per position.
Army Air Force squadron or other headquarters nonmultiple magneto central office, of which switchboard BD-91 is the main component.

Components:
BD-91 switchboard
ME-30 Maintenance equipment

 

bd91.jpg (129770 bytes)
BD-91

TC-20

Switchboard, multiple position, 30 lines per position.
Army or other headquarter complete transportable multiple type magneto and common battery central office set in which the three switchboards BD-120 like switchboard BD-110, are trunk type with handles which require no packing cases.

Components:
BD-120 switchboard
BD-132 Power Panel
RA-91 Rectifier
FM-64 Protection Panel
ME-63 Maintenance equipment


Test Equipment


BE-70

Fixed plant wire chief's voltmeter testing equipment and telephone set, to maintain common battery and magneto office equipment, station lines, and trunks. Trunks can be maintained more conveniently  with TS-26/TSM, 20 cycle hand generator or central office ringing machine, and buzzer. Has posts for adding a Wheatstone bridge for locating faults. Part of test equipment IE-10. Also part of telephone Central Office Sets TC-1 and TC-2. Tests for grounds, crosses, shorts, and opens, line capacitance to ground or to other lines, and distance on an open line.

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