Section II. DESCRIPTION AND DATA

TM 11-5815-206-12/ TO 31W4-2PGC1-61

you don't like about your equipment. Let us

used by Army activities will have preventive main

know why you don't like the design. Put it on

tenance performed in accordance with the PMC

an SF 368 (Quality Deficiency Report). Mail it to

charts before storing. When removing the equip-

Commander, US Army Communications-Electron-

ment from administrative storage the PMCS should

ics Command and Fort Monmouth, ATTN:

be performed to assure operational readiness. Dis-

DRSEL-ME-MP, Fort Monmouth, New Jersey

assembly and repacking of equipment for shipment

or limited storage are covered in chapter 6.

07703. We'll send you a reply.

b. Air Force. Air Force personnel are encour-

1 - 6 . Destruction of Army Electronics Materiel

a g e d to submit EIR's in accordance with AFR

Destruction of Army electronics materiel to pre-

900-4.

vent enemy use shall be in accordance with TM

15. Administrative Storage

750-244-2.

Administrative Storage of equipment issued to and

Section II. DESCRIPTION AND DATA

1-7. Purpose and Use

The voice-frequency signals are transmitted to a dis-

tant telegraph terminal either through telephone

a. Purpose. Teletypewriter Sets AN/PGC1 and

switching equipment or over a direct circuit inter-

AN/PGC-3, Teletypewriters TT4(*)/TG,

connecting the two telegraph terminals. The distant

TT-335/TG, TT-698(*)/TG, and TT-722(*)/TG are

telegraph terminal converts the voice-frequency

used to transmit teletypewriter messages in the form

signals to dc signals and transmits the dc signals to

of direct-current (de) teletypewriter signals and to

the receiving teletypewriter.

convert received dc signals into messages printed on a

(3) Carrier system. In a typical carrier system,

roll of recording paper. Teletypewriter TT537/G is

the sending teletypewriter transmits dc signals to a

u s e d primarily to receive low-voltage Baudot

telegraph terminal which converts the dc signals to

teletypewriter signals from a field artillery gun direc-

voice-frequency signals and transmits them to a

tion computer (FADAC) and to record the received

carrier terminal. The carrier terminal converts the

messages on 8-inch-wide recording paper.

voice-frequency signals to carrier signals and

b. Use (fig. 3). The AN/PGC-1, AN/PGC-3,

transmits the carrier signals to a distant carrier ter-

TT4(*), TT335/TG, TT-698(*)/TG, and

minal. The distant carrier terminal converts the

TT-722(*)/TG are used in tactical military com-

received carrier signals to voice-frequency signals

munication systems. Teletypewriters TT-698(*)/TG

and transmits them to a telegraph terminal where the

are Teletypewriters TT4B(*)/TG converted to low

voice-frequency signals are converted to dc signals

level signaling operation, Except for the

and transmitted to the receiving teletypewriter.

TT-698(*)/TG's ability to detect and process a much

lower level signal, all other existing operational

(4) Radio-teletypewriter system. In a typical

radio-teletypewriter system, signal transmission is

features of the basic teletypewriter TT-4(*)/TG are

unchanged. Teletypewriters

TT722(*)/TG

are

the same as in a carrier system ( (3) above), except

Teletypewriters

that transmission between carrier terminals is ac-

TT4B/TG and TT4C/TG

modified to include automatic carriage-return and

complished over a two-way radio circuit instead of a

line-feed mechanisms, and special mounting plates to

carrier circuit.

(5) FADAC system. In a typical FADAC system,

permit use of the teletypewriters in mobile

low-voltage signals from the computer are applied to

assemblages. Typical applications are:

the receive circuits of Teletypewriter TT-537/G,

(1) Dc system. In a typical dc system, the sending

where they are amplified to the level required to

teletypewriter transmits dc signals to the receiving

operate the selector magnet in the teletypewriter

teletypewriter over a dc circuit that interconnects the

receive mechanism. The keyboard transmission

two teletypewriters.

capability is not used in this application.

(2) Voice-frequency system. In a typical voice-

f r e q u e n c y system, t h e sending teletypewriter

(6) Low level signaling system. In a typical low

level signaling system line signal current is reduced

transmits dc signals to a telegraph terminal which

converts the dc signals to voice-frequency signals.

to 100 microampere or less.

change 2

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