Figure 5-25.--The TA-974/WTC-2(V) sound-powered telephone set, unit 1.

uses a variable number of 8 separate major units and

may contain up to 144 terminal stations.

PHYSICAL DESCRIPTION AND

PURPOSE OF UNITS

The eight major units of the AN/WTC-2(V)

sound-powered telephone system are as follows:

1. Unit 1--TA-974/WTC-2(V) sound-powered

telephone set

2. Unit 2--TA-975/WTC-2(V) sound-powered

telephone set

3. Unit 3--TA-976/WTC-2(V) sound-powered

telephone set

4. Unit 4--G-15/A sound-powered telephone

jackbox

5. Unit 5--H-200/U headset-chestset

6. Unit 6--J-3523/WTC-2(V) distribution box

7. Unit 7--TS-3687/WTC-2(V) telephone test set

8. Unit 8--BZ-240/WTC-2(V) audible alarm

Figure 5-25.--The TA-974/WTC-2(V) sound-powered

Units 1,2, and 3

telephone set, unit 1.

The terminal stations are units 1, 2, and 3. These

terminal stations provide the means of selecting and

calling other stations in the system.

UNIT 1.-- Unit 1 (fig. 5-25) is a bulkhead-mounted

terminal station consisting of three separate

components: call-signal station A1, handset HS1, and

handset holder MP1.

Call-signal station A1 consists of a cover assembly

and a case assembly. The cover assembly (fig. 5-26)

contains two single-pole, 12-position thumbwheel

station selection switches, a PLACE CALL/ANSWER

toggle switch, a side-crank dc hand-ringing generator

with related electronics, and an attenuator to adjust the

ring signal audio level. The case assembly is the housing

for the cover assembly and contains the necessary

terminal board and multipin connector to mate with the

plug on the cover assembly. The case assembly also

provides the means of connecting the handset.

Handset HS1 is a standard H-203/U sound-powered

telephone handset.

Figure 5-26.--Call signal station A-1.

Handset holder MP 1 is a standard holder for the

H-203/U sound-powered telephone handset. The holder

is mounted near call-signal station A1.