Chapter 5. AUXILIARY EQUIPMENT

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

CHAPTER 5

AUXILIARY EQUIPMENT

5-1. General

(a ) Place the TH-5/TG on a firm support

within 3 feet of the teletypewriter.

a. Auxiliary equipment normally is not required

(b ) C o n n e c t t h e s i g n a l l i n e s f r o m t h e

for direct communication between tactical military

distant station to the binding posts on the front

teletypewriters

separated by relatively short

panel of the TH-5/TG. Refer to TM 11-5805-25-15

distances. As the distance between teletypewriters

for installation options of the TH-5/TG. Set the

is increased, auxiliary equipment is required to

4W-2W-TEL switch on the front panel of the TH-

assure reliable interoperation of the teletypewriters.

5/RG to the proper position for the installation

switching of

tactical

b. C o n v e n i e n t

option used.

teletypewriter traffic also requires auxiliary

( c ) Connect the power "cord of the TH-

equipment,

T h i s equipment c o n v e r t s t h e d c

5/TG to a source of 115-volt, 50- to 60-Hz ac.

signals transmitted from the sending teletypewriter

(2) Prepare the teletypewriter for operation

i n t o ac signals that can be switched through

(para 2-4 through 2-8).

telephone and radio equipment. Similar auxiliary

( 3 ) Connect the teletypewriter to the TH-

equipment is required at the distant station to

5/TG (para 2-10 and 2-12).

c o n v e r t the ac signals back into dc signals for

(4) Turn the LINE INCREASE knob (fig. 3-

operation of the receiving teletypewriter.

1) on the teletypewriter until the D.C.

c . Telegraph Terminal TH-5/TG, or equal, is

M I L L I A M P E R E S meter indicates 20 ma.

with

military

normally

used

high-level

NOTE

teletypewriters to meet the requirements in a and b

The current level in the teletypewriter send

above.

circuit is determined by the circuitry of the

5-2. Purpose of Telegraph Terminal TH-5/TG

TH-5/TG and is not adjustable.

Telegraph Terminal TH-5/TG, when used with the

b. Operation. O p e r a t e t h e t e l e t y p e w r i t e r a s

AN/PGC-l, converts the dc signals, which it

described in paragraphs 3-4, 3-7, 3-8, and 3-9,

r e c e i v e s from the keyboard transmitter of the

except as follows:

sending teletypewriter into voice-frequency signals.

( 1 ) Before starting transmission from the

The voice-frequency signals are then transmitted

teletypewriter, be sure the lamp on the front panel

either directly to another TH-5/TG at the

of the TH-5/TG is lighted. This lamp is a busy

receiving station, t h r o u g h telephone switching

signal that goes out when any teletypewriter in the

e q u i p m e n t to the distant TH-5/TG, or through

circuit begins transmitting.

other carrier or radio equipment to the TH-5/TG

(2) When the teletypewriter is connected

at the distant station as shown in figure 1-3. The

through a TH-5/TG to a telephone switchboard,

TH-5/TG at the distant station converts the

signal the switchboard operator as follows:

received voice-frequency signals back to dc signals

(a ) Press and release the RING switch on

and transmits the dc signals to the page printer of

the TH-5/TG to signal the operator of a local-

t h e receiving teletypewriter. The TH-5/TG also

battery switchboard.

permits simultaneous teletypewriter and telephone

( b ) Operate the 4W-2W-TEL switch to the

transmission over a signal circuit when the TH-

2 W position ( 2 - w i r e o p e r a t i o n ) o r t o t h e 4 W

5/TG is used in conjunction with other auxiliary

position (4- wire operation) to signal the operator of a

equipment.

common battery switchboard. At the completion of

5-3. Use of TH-5/TG with AN/PGC-1

operate the switch to the TEL

transmission,

position.

a. Installation.

(1) p r e p a r e t h e T H - 5 / T G f o r o p e r a t i o n a s

follows:

5-1