TACTICAL TELEPHONES

Subcourse Number SS0441

EDITION A

United States Army Signal Center and Fort Gordon

Fort Gordon, Georgia 30905-5200

8 Credit Hours

Edition Date: September 1994

SUBCOURSE OVERVIEW

This subcourse is designed to teach you the installation and operation procedures for tactical telephones.

This information will be useful to you if you are in a signal unit supporting another unit; a signal

battalion within a division that is equipped with mobile subscriber equipment (MSE); or a signal unit

supporting echelons above corps.

There are no prerequisites for this subcourse.

This subcourse reflects the doctrine which was current at the time it was prepared. In your own work

situation, always refer to the latest official publications.

Unless otherwise stated, the masculine gender of singular pronouns is used to refer to both men and

women.

TERMINAL LEARNING OBJECTIVE

ACTION:

You will learn the procedures to install telephone sets TA-312/PT, TA-341( )/TT,

TA-838( )/TT, TA-954/TT, TA-1035/TT; terminal equipment TD-1233/TT and TD-

1234/TT. You will also learn how to perform maintenance on telephone set TA-838(

)/TT and complete DA Form 2404.

CONDITION:

If you do not have access to the equipment, you only need this subcourse. If

available, you will need telephone sets TA-312/PT, TA-341( )/TT, TA-838( )/TT,

TA-954/TT, TA-1035/TT; terminal equipment TD-1233/TT, TD-1234/TT; gloves;

TL-13A; telephone cable WD-1( )/TT, WF-16/U; test set TS-3647/G; CX-11230(

)/G; preset stub pole or tree; desk ground rod; ground strap; rubber mallet; power

cable; screwdriver and a training area.

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STANDARD:

Upon completion of this subcourse, you will know the procedures for installing

telephone sets TA-312/PT, TA-341( )/TT, TA-838( )/TT, TA-954/TT, TA-1035/TT;

and multiplexer TD-1233/TT and multiplexer-combiner TD-1234/TT. You must

achieve 70 percent on the written examination to receive credit for this subcourse.

WARNING

Never work on electronic equipment unless there is another person

nearby who is familiar with the operation and hazards of the

equipment, and who is competent in administering first aid. When

the technician is aided by operators, he must warn them about

dangerous areas.

Whenever possible, the power supply to the equipment must be shut

off before beginning work on the equipment. Take particular care to

ground the equipment prior to connection to a power source.

Whenever the nature of the operation permits, keep one hand away

from the equipment to reduce the hazards of current flowing through

vital organs of the body.

Do not be misled by the term "low voltage." Potentials as low as 50

volts may cause death under adverse conditions.

For artificial respiration, refer to FM 21-11.

Do not lay, place, or throw field wire on or near power lines or

transformers. Dangerous high voltages exist at these structures and

death or severe shock may result from contact between the field wire

and power lines.

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TABLE OF CONTENTS

Section

Page

Subcourse Overview .................................................................................................................................... i Grading and Certification Instructions....................................................................................................... iv Lesson 1: Install a Tactical Telephone ..................................................................................................... 1-1

Part A

Telephone Set TA-312/PT ................................................................................... 1-2

Part B:

Telephone Set TA-341( )/TT ............................................................................... 1-8

Part C:

Telephone Set TA-838( )/TT ............................................................................. 1-14

Part D:

Telephone Set TA-954/TT ................................................................................. 1-25

Part E:

Telephone Set TA-1035/U ................................................................................. 1-28

Part F:

Multiplexer TD-1233/TT and Multiplexer-Combiner

TD-1234/TT ....................................................................................................... 1-29

Practice Exercise ................................................................................................................... 1-41

Answer Key and Feedback .................................................................................................... 1-48

Lesson 2: Maintenance ............................................................................................................................ 2-1

Part A:

Unit Level Maintenance on Tactical Telephones ................................................ 2-2

Part B:

Unit Level Maintenance on Telephone Terminals............................................... 2-9

Practice Exercise ................................................................................................................... 2-12

Answer Key and Feedback .................................................................................................... 2-14

Examination ............................................................................................................................................. E-1

Student Inquiry Sheets

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GRADING AND CERTIFICATION INSTRUCTIONS

Examination: This subcourse contains a multiple-choice examination covering the material in the two

lessons. After studying the lessons and working through the practical exercises, complete the

examination. Mark your answers in the subcourse booklet, then transfer them to the ACCP examination

response sheet Completely Mack out the lettered oval which corresponds to your selection (A, B, C, or

D). Use a number 2 lead pencil to mark your responses. When you have completed the ACCP

examination response sheet, mail it in the preaddressed envelope you received with this subcourse. You

will receive your examination score in the mail. You will receive eight credit hours for successful

completion of this examination.

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LESSON 1

INSTALL A TACTICAL TELEPHONE

Critical Tasks: 113-600-1003,

113-600-1012, 113-600-1016,

113-600-1017, 113-588-1096

OVERVIEW

LESSON DESCRIPTION:

In this lesson, you will learn how to install tactical telephones. This is a very important part of your job.

The persons who will use these instruments expect them to be in good operating condition and be

connected to the right equipment to provide them the necessary service.

TERMINAL LEARNING OBJECTIVE:

ACTION:

You will learn the procedures to install a tactical telephone.

CONDITION:

If you do not have access to the equipment, you only need this subcourse. If

available, you will need telephone sets TA-312/PT, TA-341( )/TT, TA-838( )/TT,

TA-954/TT; digital nonsecure voice terminal (DNVT) TA-1035/TT; multiplexer TD-

1233/TT, multiplexer-combiner TD-1234/TT, junction box J-1077A/U; telephone

cable WD-1( )/TT; WF-16/U; TL-13A; gloves; rubber mallet; ground rod; ground

strap; power cord; CX-11230( )/G; test set TS-3647/G; and a training area.

STANDARD:

Upon completion of this subcourse, you will know the procedures for installing

telephones and the multiplexer or multiplexer-combiner.

REFERENCES: The material contained in this lesson was derived from TM 11-5805-201-12, TM 11-

5805-384-12, TM 11-5805-650-12, TM 11-5805-735-12, TM 11-6110-201-12P, TM

11-5805-761-12&P, TM 11-5805-703-12, TM 11-5805-706-12, TM 11-5805-707-12,

DA Pam 738-750, and DA Pam 25-30.

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INTRODUCTION

Commanders and staff require fast communications on a personal level as often as it is available. In

garrison, there is no problem since everyone has a telephone on his desk. However, when the unit goes

to a tactical situation in the field, they desire the same fast communications that were available in

garrison.

That is where the wire systems installer comes in. It is his duty to install tactical telephones from a

priority list that permits the commander and his staff to have the same type communications as was

available in garrison.

There is a need for point-to-point communications for some and for others there is a need to

communicate with many different people at different times. The different types of telephones we have

available in the unit will provide this service when it is required.

There are many tactical telephones that will accomplish this. Some of them are telephone sets TA-

312/PT, TA-341( )/TT, TA-838( )/TT, TA-954/TT, and DNVT TA-1035/U. Some or all of these

instruments may be in your unit.

In addition, there are different means of getting the signal from the telephone to the distant person.

Some will be connected through a switchboard, some will be connected through intermediate equipment

prior to a switchboard, and some will be multiplexed in an effort to reduce the number of wire lines that

must be put in to extend these instruments.

Within this subcourse, we are going to be discussing telephone installation and maintenance. We will

also be discussing some of the other equipment needed to get the signal from the telephone set to

wherever it must go. Where the wires are identified as green or brown it is recommended you color

them for your full and comprehensive understanding of the technical material.

PART A - TELEPHONE SET TA-312/PT

1.

The TA-312/PT is an old telephone, but is very reliable and will provide many hours of

uninterrupted use when it is installed properly and not abused. We will be discussing characteristics,

installation, and operation.

2.

The TA-312/PT is a 2-wire, battery-operated field telephone. It may be used in a simple point-to-

point voice frequency wire communication line or any 2-wire ringdown subscriber position of a

telephone communication system.

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3.

Technical characteristics:

a. Voltage requirement................................................................................................... 3 volts DC

b. Frequency range .................................................................................................. 300 to 3200 Hz

c. Signaling:

Frequency ..................................................................................................................... 20 Hz

Voltage generated .......................................................................................... 90 to 100 volts

d. Station-to-station distance:

WD-1( )/TT ..................................................................................... 14 wet and 22 dry miles

4.

All connections and operating controls of the TA-312/PT are located on the panel assembly and

housing. The handcrank (part of generator, ringing, hand G-42A/PT) for generating the ringdown signal

is located on the side of the housing. Connector, receptacle U-79/U allows connection of handset-

headset H-144( )/U for use in place of the H-60/PT. (See Figure 1-1.)

Figure 1-1. Telephone set TA-312/PT, case closed.

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5.

Two batteries BA-30 or BA-3030 or an external 3-volt DC source are required. The external

source must be connected to the battery (BAT) binding posts. (See Figure 1-2.)

Figure 1-2. Telephone set TA-312/PT, controls and indicators.

6.

Installation. The telephone may be used as a desk phone, or it may be mounted vertically on a

tree, pole, or other support.

a. Use as a desk set. Unbuckle the carrying case retaining strap and remove the housing

assembly from the carrying case. Store the carrying case for later use. Place the telephone in a

convenient location on the desk.

b. Installation on a tree or pole. Unhook the end of the carrying strap on the BZ-23/PT end of

the carrying case. Adjust the carrying strap to a length equal to the distance around the support For a

thin support, adjust it to go two times around the support. Place the TA-312/PT against the support with

the LINE 1-2 binding posts at the top. Wrap the carrying strap around the support and secure the free

end to the upper ring on the carrying case. Wrap a length of WD-l( )/TT around the support and through

the lower loop of the carrying case; tie it securely in place.

c. Use a screwdriver to set the SELECTOR switch to the proper position for the service being

used.

d. To connect the WD-1( )/TT. Strip approximately 1 inch of insulation from the ends of the

two wires in the line. Be sure the wire is clean of any residue. Fold back the stripped wires about one-

half inch from the end. Push down one of the LINE 1-2 binding posts. Insert the bare end of one wire

into the binding post slot and release the post. Check to see that the wire is securely clamped. Repeat

the procedure with the other wire in the other post.

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e. Battery installation. If you are going to use an external battery, be sure to check the battery

compartment and remove any batteries that are in it. Connect a 3-volt battery source to the BAT binding

posts on the panel. If you are going to use internal batteries, open the battery compartment by turning

the battery compartment latch clockwise. Insert one battery with the positive terminal up and one

battery with the positive terminal down. Close the compartment and turn the latch counterclockwise to

lock the cover closed (See Figure 1-2.)

7.

Deicing screen. In cold climates, install the deicing screen to prevent the operator's breath from

freezing on the transmitter. Place the screen in position over the front of the transmitter cap. Use your

finger or the blade of a screwdriver to press evenly around the rim of the screen and seat it firmly in the

slot around the face of the transmitter cap. To remove the deicing screen when not needed, insert the

blade of a screwdriver in the slot in the transmitter cap. Pry up the screen with a twisting motion. Store

the screen in the carrying case between the case and the side of the housing opposite the buzzer.

8.

Installation of the off-hook lamp assembly. (See Table 1-1 for controls and indicators and their

specific functions.)

NOTES: The security lamp is to alert personnel that handset H-60/PT is not seated

properly in its retaining brackets leaving the line open. The lamp is for use only in

sensitive areas; it is not to be installed on every telephone set in the field.

Remove the panel screw nearest the LINE binding posts. Secure the off-hook lamp

assembly to the panel with this screw, keeping the lamp portion of the attachment

snuggled near the telephone cradle. Run the lead of the off-hook lamp assembly around

the handset retaining bracket and connect its two terminals to the BAT binding posts on

the panel.

9.

Buzzer BZ-23/PT adjustment. Contact a distant party or the switchboard and ask them to ring on

the line. Adjust the LOUD-LOW control to the desired volume. The fully clockwise position of the

control is the maximum LOUD position.

10. Connecting handset-headset H-144( )/U. Connect handset-headset H-144( )/U by connecting the

plug on the H-144( )/U to the connector receptacle U-79/U on the panel of the TA-312/PT. Leave the

H-60/PT in the retaining cradle while the H-144( )/U is connected.

11. Initiating a call (CB and CBS operation using H-60/PT). Place the INT-EXT switch to INT.

Remove the H-60/PT from its retaining cradle and wait for the switchboard operator to answer. For

CBS operation, press the PRESS-TO-TALK switch to TALK and release it when listening. For CB

operation, do not use the PRESS-TO-TALK switch. When the call is terminated, replace the H-60/PT in

its retaining cradle.

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a. CB and CBS operation using H-144( )/U. Make sure the H-60/PT is seated firmly in the

retaining cradle. Operate the INT-EXT switch to EXT and wait for the operator to answer. For CBS

operation, press the PRESS-TO-TALK switch to TALK and release it to listen. For CB operation, the

PRESS-TO-TALK switch is not used. When the call is terminated, place the INT-EXT switch to INT.

Table 1-1. Controls and indicators.

b. LB operation using H-60/PT. Place the INT-EXT switch to INT. Make sure the H-60/PT is

seated firmly in the retaining cradle. Turn the handcrank rapidly a few turns. Remove the H-60/PT

from the retaining cradle and wait for the operator or called party to answer. Press the PRESS-TO-

TALK switch to TALK and release it to listen. When the call is terminated, replace the H-60/PT in the

retaining cradle and turn the handcrank rapidly a few turns. This will signal the switchboard that the call

has been completed.

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c. LB operation using H-144( )/U. Make sure the H-60/PT is firmly seated in the retaining

cradle. Place the INT-EXT switch to EXT and turn the handcrank rapidly for a few turns. Wait for the

called party or the switchboard to answer. Press the PRESS-TO-TALK switch to TALK and release it

to listen. When the call is terminated, release the PRESS-TO-TALK switch and turn the handcrank

rapidly a few turns. This will signal the switchboard that the call has been completed.

12. Answering calls. When the BZ-23/PT sounds, remove the H-60/PT from the retaining cradle. For

LB or CBS operation, press the PRESS-TO-TALK switch to TALK and release it to listen. For CB

operation, it is not necessary to operate the PRESS-TO-TALK switch. When the call is terminated,

replace the H-60/PT in the retaining cradle. After LB operation, turn the handcrank rapidly a few turns

to signal the switchboard that the call has been completed.

NOTE: If using the H-144( )/U, make sure the H-60/PT is seated firmly in the retaining cradle.

When the buzzer sounds, place the INT-EXT switch to EXT. For LB or CBS operation, press

the PRESS-TO-TALK switch to answer and release it to listen. For CB operation it is not

necessary to operate the PRESS-TO-TALK switch to answer. When the call is terminated,

release the PRESS-TO-TALK switch. After CB or CBS operation operate the INT-EXT switch

to INT. After LB operation, turn the handcrank rapidly a few turns to signal the switchboard that

the call is completed.

13. Operating under unusual conditions.

a. Extreme cold reduces battery voltage, decreases the efficiency of the transmitter and receiver,

and makes the H-60/PT and H-144( )/U cords and other rubber parts stiff and brittle. Protect the TA-

312/PT as much as possible. If the TA-312/PT must be kept outdoors in the extreme cold, install

batteries BA-3030 in place of the BA-30s, or keep an extra set of BA-30s in your pocket to keep them

warm. The extra batteries may be used to replace batteries affected by the cold. Make sure the deicing

screen is installed. Handle the TA-312/PT carefully to avoid breaking or cracking the rubber parts.

b. Hot dry climates expose the TA-312/PT to damage from dirt, dust, and the effects of strong

sunlight. Protect the TA-312/PT from these elements. Clean and dust the equipment frequently. When

the TA-312/PT is not in use, close the slide fastener to keep out dust and dirt.

c. Warm, damp climates expose the TA-312/PT to damage from fungus and moisture. Wipe

the exterior with a clean, lint-free cloth.

d. Emergency power operation. If no battery supply is available, it is possible to transmit for

approximately 4 miles by using the receiver element as a sound-powered transmitter element. Speak

directly into the receiver element, then listen while the distant party is transmitting.

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14. Now you should be able to install a telephone set TA-312/PT on a pole or tree for LB operation.

PART B - TELEPHONE SET TA-341( )/TT

15. Telephone set TA-341( )/TT is a 4-wire, pushbutton, desk type telephone that is used primarily

indoors. It should be in a building or inside a tent. It must be protected from the weather.

16. The voltage requirements for this telephone is 4.4 to 6.4 volts DC. This is provided by batteries

BA-42 or BA-3042. They are installed in the telephone base in the compartment between the two

controls marked RINGER VOLUME and the MODE SELECTOR switch. The battery that is next to the

RINGER VOLUME control has the positive terminal up. The next battery has the positive terminal

down, then up, and finally down. When the batteries are in position, you must close the compartment

door and secure it with a screwdriver. (See Figure 1-3.)

Figure 1-3. Battery compartment and installation.

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17. This telephone works in five different operating modes as shown in Table 1-2.

Table 1-2. TA-341( )/TT operating modes.

18. There are three controls that must be set to have the telephone set work correctly.

a. The LOCAL BATTERY/COMMON BATTERY (LB/CB) switch and the MODE switch we

have just discussed.

b. The third switch is the RINGER VOLUME control. This controls the loudness of the ringer,

not the volume at which you hear the distant party.

c. Other items of interest on the telephone are:

Handset

Connected to the telephone set and used to transmit and receive

message.

HOOKSWITCH

When the handset is placed in the cradle, the HOOKSWITCH

disconnects the telephone from the switchboard or distant party.

Keysender pad

When connected to a switching facility, it is used to dial the distant

party.

Retaining strap

Used to secure the handset in the cradle when transporting or

storing the telephone set.

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19. Preinstallation checks. Set the LB/CB and MODE switch to the proper position. For our use, we

will install a telephone for point-to-point operation. Install the batteries in the telephone as discussed in

paragraph 16, then place the LB/CB switch in the LB position. The MODE switch is placed in the AC

SUPERVISION position. Now, if you pick up the handset, little or no sidetone can be heard in the

receiver when you speak into the microphone. When you press each key on the keysender pad, there is

little or no tone heard in the receiver. Switch the LB/CB switch to point-to-point. Speak into the

microphone and a tone should be heard. If you press each key on the keysender pad, you will hear a

tone that is lower than the previous one. Place the handset on the cradle. Using a flat-tip screwdriver,

connect a resistor 1000 ohms between the red and black terminals on the connector block and another to

the green and yellow terminals (See Figure 1-4.)

Figure 1-4. Resistor connection.

20. Setting up for point-to-point operation. Remove the resistors from the connector block. It is now

time to connect the WF-16/U telephone cable to the terminal block. You must remove one inch of

insulation from each of the four wires to prepare them for connecting to the C42 block.

a. Connect the two brown wires to the R and Y terminals of the connector block. This is the

receive (RCV) side of the telephone set. Connect the two green wires to the G and B terminals of the

connector block. This is the transmit (XMIT) side.

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b. If you were to go to the other end of the WF-16/U and connect the WF-16/U to the second

telephone, you would have to connect the wires the opposite of what you did before--green wires to R

and Y terminals and brown wires to G and B terminals. (See Figures 1-5 and 1-6.)

Figure 1-5. Cabling diagram for point-to-point operation.

Figure 1-6. Cabling illustration for point-to-point operation.

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c. Ensure both telephones have the MODE SELECTOR switch in POINT-TO-POINT and the

BATTERY switch to LB.

d. Point-to-point operation. Lift the handset of either telephone. The other telephone should

ring one time and the CALL indicator should light. If there is no answer, press down the

HOOKSWITCH and release it to send another ring. Once the party answers, you can have a two-way

conversation. When you finish, just place the handset in the cradle being sure to place the handset on

the HOOKSWITCH to clear it.

21. Operating with a switching facility. In order for the telephone to operate with a switching facility,

you must know if the system is working DC or AC. Then you must set the MODE SELECTOR switch

and the LB/CB switch to their proper positions. In addition, WF-16/U telephone cable must he

connected, usually to a J-1077A/U, to get the signal to the facility. You would connect the green

conductors to the G and B terminals on the C42 connector block and to pair 1 of the J-1077A/U. You

would have to connect the brown conductors to the R and Y terminals of the C42 block and to pair 2 of

the J-1077A/U. Odd pair transmits, even pair receives.

a. An incoming call is signaled by the normal series of tone and silence. The type of call is

determined by the rates of tone and silence. A routine call has two seconds of tone followed by four

seconds of silence. Any priority call has one second of tone and one second of silence. The visual ring

indicator lights at the same rate as the tone. Simply lift the handset and have your conversation. Be sure

to place the handset back in the cradle on the HOOKSWITCH to release the line.

b. An outgoing call is rather easy. Remove the handset from the cradle and listen for the dial

tone. Press and release the numbered keys on the keysender pad, one at a time, for the number being

called. If a mistake is made, press and release the HOOKSWITCH and try again. Listen for a ringback

or busy signal. If a busy signal is heard, replace the handset on the cradle and try again later.

c. When assistance or information is required, an operator can be called using the following

procedure. Pick up the handset and listen for the dial tone. Press and release the 0 (zero) key on the

keysender pad. Listen for a ringback or a busy signal. If the operator answers, obtain your information.

If the operator connects you to another person and you need more assistance, use the R key. Press and

hold the R key until a recall response is heard. Release the key and wait for the operator to answer the

recall. There will not be a ringback or busy signal for an operator recall.

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d. Priority calling. To make a priority call or precedence call, the following procedure is used.

Pick up the handset and listen for a dial tone. Press and release the R key on the keysender pad. Press

and release a numbered key corresponding to these priority levels:

Key 1 ...................PRIORITY

Key 2 ...................IMMEDIATE

Key 3 ...................FLASH

Key 4 ...................FLASH OVERRIDE

Continue with the normal calling sequence by pressing and releasing the numbered keys for the number

being called.

NOTES: If you try to make a higher priority call than is assigned to you, the switching

facility will automatically reduce the priority to your assigned level.

Use of priority calling can break in on a conversation already in progress. If a priority

call is placed to a person making a ROUTINE or lower level priority call, the person

called will first hear a two-second, low pitched, dual tone. The other person will hear a

single, high-pitched tone. The old connection will be broken and the priority caller will

be connected to the desired person.

If a priority call is placed when all available trunk lines are busy, a lower priority trunk

line will be freed for the priority call. Both callers on that trunk line will hear a high

pitched tone before being disconnected.

22. Conference calls. To make conference calls use the following procedure.

a. Broadcast conference. Pick up the handset and listen for the dial tone. If priority calling is

wanted, press the R key and a priority digit Press and release the C key. Listen for the dial tone. Press

digit keys for the number that has been previously assigned to the conference.

b. Progressive conference. Pick up the handset and listen for the dial tone. If priority calling is

wanted, press the R key and a priority digit. Press and release the C key. Listen for the dial tone. Press

the digit keys for the number of the first person. If the person does not answer or the line is busy, press

the R key to release the number. When each person answers, repeat this procedure for each additional

person. A maximum of four people may be called.

c. Meet-Me conference. Pick up the handset and listen for the dial tone. At the assigned time,

press the digit keys for the assigned number.

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d. Preprogrammed conference. Pick up the handset and listen for the dial tone. If priority

calling is wanted, press the R key and a priority digit. Press the digit keys for the number assigned to

the conference. Press and release the C key. Wait for everyone to answer. Release any unanswered or

busy number by pressing the R key for one second and releasing.

23. Special operations when used with AN/TTC-38 switching facility. The AN/TTC-38 switching

facility has the capability for special trunk services and information calls. Procedures to access the

special trunks are provided. To place an informal call, you merely call the specified number.

a. Pick up the handset and listen for the dial tone. If priority calling is wanted, press the R key

and a priority digit. Press and release the R key. Press and release a numbered key corresponding to the

special trunks.

Key 5 ....................SF commercial trunk

Key 6 ....................Wideband trunk

Key 9 ....................Defense Switched Network (DSN)

b. Press keys for the desired number.

24. Extension service is available with this telephone. The first and succeeding telephones, up to a

maximum of four, are connected to the man line in the same manner as the original. (See Figure 1-7.)

Figure 1-7. Cabling for extension operation.

PART C - TELEPHONE SET TA-838( )/TT

25. This is a 4-wire tactical telephone capable of 2-wire operation that can be used in mobile

subscriber equipment (MSE) units and units equipped with digital group multiplexer (DGM) equipment.

It is a ruggedized, solid-state field telephone. It can be used as a desk telephone or installed vertically.

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26. List of abbreviations and glossary.

AC/CB

Switchboard provides AC supervision and common battery power for the

telephone set.

AC/LB

Switchboard provides AC supervision, Telephone set gets power from its

own local batteries.

DC/CB

Switchboard provides DC supervision and common battery power for the

telephone set.

DC/LB

Switchboard provides DC supervision. Telephone set gets power from its

own local batteries.

DTMF

Dual-tone multifrequency signaling. Each key on the keysender pad

produces a different tone.

Key C

The conference key

Key F

FLASH priority

Key FO

FLASH OVERRIDE priority

Key I

IMMEDIATE priority

Key P

PRIORITY

Key R

Will recall the operator during a call or the line release key during a

conference call when used with an AN/TTC-38(V). When used with an

SB-3614(V)/TT, it has the same function as the P key.

27. Equipment data.

a. Transmission frequency range: 300 to 3500 Hz.

b. Distance ranges with DC supervision: The telephone set is located less than 4 miles from the

switchboard.

c. Distance ranges with AC supervision: The telephone set can be located more than 4 miles

from the switchboard.

d. Battery power for arctic operations: Four each BA-3042/U.

e. Battery power for all other operations: Four each BA-42/U.

f. Weight: 6.5 pounds.

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28. Operator controls, indicators, and receptacles.

a. Binding posts. The two XMIT binding posts are color-coded black and marked with 2W.

The two RCV binding posts are color-coded red. (See Figure 1-8.)

Figure 1-8. Binding posts.

b. The wires connected to the binding posts must be clearly identified at all times. The wires

may be tagged, color-coded, or identified as directed by the team chief.

CAUTION

Do not attempt any wire connections if the wires are not clearly identified.

Ask your team chief for instructions if you have any questions.

c. For 4-wire operation, the pair of wires identified FROM RECEIVE are connected to the

XMIT binding post.

d. The pair of wires identified FROM SEND are connected to the RCV binding posts. (See

Figure 1-9.)

e. For 2-wire operation, the send/receive pair of wires are connected to the XMIT binding posts.

No wires are connected to the RCV binding posts. (See Figure 1-10.)

f. The LED RING indicator lamp is controlled by the ON-OFF switch and will glow when a

ringing signal is received. (See Figure 1-11.)

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1-16

Figure 1-9. Four-wire identification.

Figure 1-10. Two-wire identification.

g. The ON position of the ON-OFF LED switch will allow the LED RING indicator lamp to

glow when a ringing signal is received; OFF will disconnect the lamp. (See Figure 1-11.)

h. The RING VOLUME control controls the volume of the tone ringer. (See Figure 1-11.)

i. Tone ringer. Gives off an audible signal when a ringing signal is received. Located on the

right side of the telephone set.

1-17

SS0441

Figure 1-11. Ringer controls.

j. Handset and HOOKSWITCH. The handset is attached to the telephone set by a retractable

cord. When the handset is not in use (on-hook), it is placed on top of the HOOKSWITCH and the

HOOKSWITCH plunger is pressed down. The telephone set ringer circuits are now connected to

receive a ringing signal (See Figure 1-12.) When the handset is lifted off the HOOKSWITCH (off-

hook), the ringer circuits are disconnected and the telephone set sends an off-hook signal to the distant

equipment switchboard or telephone set). (See Figure 1-13.)

k. When the handset is placed on the HOOKSWITCH (on-hook) after a call is completed, the

telephone set sends an on-hook signal to the distant equipment and the ringer circuits are connected.

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1-18

Figure 1-12. Handset (on-hook).

Figure 1-13. Handset (off-hook).

1-19

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29. Battery installation. With the telephone sitting on a desk or level area with the binding posts to the

right the battery compartment is in the right rear position of the telephone as you look down on it.

a. To insert batteries, the compartment must be opened and checked for foreign matter. To

open the compartment, turn the thumbscrew counterclockwise and lift the cover. (See Figure 1-14.)

Figure 1-14. Battery compartment cover.

b. Polarity of batteries is important. Check the cells before inserting to forego any problems.

The top of the cell with the button on it is the positive (+) and the bottom of the cell that is flat is the

negative (-). (See Figure 1-15.) Insert the batteries in the compartment as shown in Figure 1-16.

c. Visually double check the polarity of the four cells. Carefully close the battery compartment

cover and lock it. Do this by turning the thumbscrew clockwise.

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1-20

Figure 1-15. Battery cell.

Figure 1-16. Battery compartment.

1-21

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30. Preinstallation check. This check is made without wire connections to the telephone set.

a. Set the MODE SELECT switch to AC/LB. Use a screwdriver or a coin. (See Figure 1-17.)

Figure 1-17. MODE SELECT switch.

b. Unlatch the tie-down strap and lift the handset off-hook. Speak into the microphone and

listen for sidetone. You should hear very low level sidetone or no sidetone at all. Press each of the 16

keys on the keysender pad one at a time. The sound level (if any) of each key tone should be very low.

Place the handset on-hook.

c. Set the MODE SELECT switch to PT-PT. Lift the handset off-hook and speak into the

microphone. Wait at least four seconds before speaking. Listen for the sidetone level. It should be

normal sidetone. Press each of the 16 keys on the keysender pad one at a time. The sound level of each

key tone you hear should be a little lower than the sidetone level of your voice. Place the handset on-

hook.

d. Press each binding post until its slot is visible and place one 1000-ohm resistor between one

XMIT (black) binding post and one RCV (red) binding post. Release the binding post to secure the

resistor. Then place another 1000-ohm resistor between the other XMT and RCV binding posts. (See

Figure 1-18.)

Figure 1-18. Resistor connection.

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1-22

e. Lift the handset off-hook and speak into the microphone. Listen for the sidetone level. Your

voice sidetone (if any) should be lower than the level before. Press each of the 16 keys on the keysender

pad. The sound level (if any) should be louder than the level you heard before. Place the handset on-

hook. Depress the binding posts and remove the resistors.

31. Preparation for desk use. Loosen the carrying sling by moving the slide buckles. Unhook the strap

and place the sling out of the way. Unsnap the tie-down strap. Adjust its length with the slide buckle so

the strap can reach under the case. Place the strap under the case and snap it into place. Lift the handset

and place the handset retaining spring in the latched position. Squeeze the sides of the spring and move

it back behind the two tabs. Release the pressure to keep the spring latched behind the two tabs. When

latched, the spring cannot hold the handset. (See Figure 1-19.) Place the handset on-hook.

Figure 1-19. Spring latched.

32. Preparation for vertical mounting of the telephone set. Loosen and lengthen the carrying sling.

Loosen and unsnap the handset tie-down strap. Lift up the handset off-hook. Place it under the

telephone set and snap it into place. Check the handset retaining spring to ensure it is in the unlatched

position. It should be forward past the tabs. (See Figure 1-20.) Use the carrying sling to secure the

telephone set to a pole or tree. Place handset on hook.

33. Switchboard operation.

a. SB-3614. Set the RING VOLUME control to midrange. Make sure the MODE SELECT

switch is set to 2-WIRE DC/CB. Life the handset off-hook and listen for the dial tone. Then dial 0.

You should hear a switchboard ringback tone that pulses every two seconds. When the operator

answers, ask for a ringback. Hang up the handset. When the phone rings, adjust the VOLUME control

and then talk to the operator to ensure proper operation.

1-23

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Figure 1-20. Spring unlatched.

b. AN/TTC-38. Set the RING VOLUME control to midpoint. Set the MODE SELECT switch

to 4-WIRE AC/CB. Take handset off-hook. Listen for the dial tone. Press 9 and the tone should stop.

Now press keys 5, 1, and C. Hang up the handset. Your phone should ring. Adjust the RING

VOLUME control if necessary. Go off-hook and listen for the dial tone. When you get the dial tone,

hang up the phone and you are ready for operation.

34. Four-wire extension service.

a. One or more extension sets may be connected as shown in Figure 1-21. All XMITs are

connected together and all RCVs are connected together. This applies to all extensions connected to the

main line of the telephone.

b. Make sure the MODE SELECT switch on each telephone set is set to the same position. Fill

in each station card with the assigned number. Make sure each telephone set has batteries if 4-WIRE

DC/LB or 4-WIRE AC/LB modes are used. Remember, only the last extension to go on-hook will

disconnect the line.

35. Now get a telephone set TA-838( )/TT, some WF-16/U or enough WD-1( )/TT, and install the

telephone set to be used in a point-to-point operation.

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1-24

Figure 1-21. Extension service.

PART D - TELEPHONE SET TA-954/TT

36. Purpose and use. The DNVT TA-954/TT is a 4-wire telephone set which transmits and receives

conditioned diphase-modulated digital voice and loop signaling at the rate of 16 or 32 kilobits per

second (kbs). Selection of the 16 or 32 kb/s is accomplished by the use of a switch alongside the

binding posts.

37. Function and interface. The DNVT operates from a common battery voltage of +24 to +56 volt

appearing on the 4-wire lines. The DNVT contains built-in protection from nuclear high energy

electromagnetic pulses (EMP) and lightning. The DNVT includes an audio interface, analog-to-

digital/digital-to-analog (A-D/D-A) conversion, loop interface, signaling and supervision, power and

control. It directly interfaces with specific digital equipment.

1-25

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38. Installation.

a. Mounting. The DNVT has rubber feet for desktop mounting and D-rings affixed to the case

side for vertical mounting to a tree or pole. Mounting may be accomplished by the use of rope, wire, or

straps. Secure one end to the left side D-ring. Hold the DNVT in the desired mounting position. Feed

the rope, wire, or strap through the top right side D-ring; tighten and secure. (See Figure 1-22.)

Figure 1-22. DNVT vertical mounting details.

b. Bit rate selection. Use a screwdriver to set the switch to the 16 or 32 kb/s RATE position.

WARNING

Voltages as high as +56 may be encountered at the transmit and

receive pairs of the field wire/cable. Use extreme caution when

making connections.

c. Field wire connection. Insert the wire/cable WF-16/U through the lower right D-ring for

strain relief. Prepare the wire/cable by removing 1/2 inch of insulation from the wire. Strip 1/2 inch

more and pull it to the end of the wire. Cut off 1/4 inch of the end of the wire. Connect the field

wire/cable by pushing the end of the proper binding post, insert the wire end into the opening of the

binding post, and release the binding post. (See Figure 1-23.)

SS0441

1-26

Figure 1-23. DNVT field wire/cable connections.

39. Operation. The operation of this instrument is similar to the telephone set TA-838/TT.

a. Differences. Some TA-954/TT DNVTs have an H-350/U handset. This handset can be used

normal by just speaking and listening. If desired, press the PUSH-TO-NRI switch to key the radio and

speak; release to listen. For users with H-250/U handset, press the PUSH-TO-TALK switch to speak

and release to listen.

b. Completion of call. Replace handset in cradle. Ensure the handset is under cradle bar and

RING/OFF-HOOK indicator light is off.

c. Types of operation. In addition to the normal operation of the TA-954/TT, the operator can

make use of the following types of calls:

Outgoing conference call

Incoming conference call

Outgoing precedence call

Incoming precedence call

1-27

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PART E - TELEPHONE SET TA-1035/U

40. This telephone is very similar to the TA-954/TT. As a prime subscriber terminal, the TA-1035/U

provides full-duplex, conditioned diphase digital voice and loop signaling information with wire, and

mobile access equipment. It also provides supervisory, clock, plain text, and voltage reference signals

with data devices. The TA-1035/U provides a data port for interfacing the SST and AN/UXC-7 data

devices to the MSE network. The TA-1035/U operates in a COMMON BATTERY power mode,

deriving its power from the switch line termination circuit. (See Figure 1-24.)

Figure 1-24. TA-1035/U telephone digital nonsecure voice.

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1-28

41. Technical characteristics:

Power requirement ........................................................................................................... 48 V DC

Power consumption:

Off-hook (Powered up) ............................................................................... 1.5 W (maximum)

On-hook (Powered down) ....................................................................... 300 mW (maximum)

NSN: 5805-01-246-6826 ($12,572.00)

TM 11-5805-761-12

PART F - MULTIPLEXER TD-1233/TT AND

MULTIPLEXER-COMBINER TD-1234/TT

42. One terminal you might have to install prior to the installation of the telephone sets is a J-

1077A/U. This junction box has terminals inside for 26 pairs of wires. To connect a 4-wire telephone

you would connect the transmit wires to the odd terminals (1, 3, 5, 7, and so forth) and the receive pairs

to the even terminals (2, 4, 6, 8, and so forth). However, you do not want to split the installation. If you

are installing a telephone set TA-838( )/TT, you would put the transmit wires to terminals 1 and the

receive wires to terminals 2. Then the next telephone would go transmit to 3 and receive to 4. Do this

until you have installed 12 4-wire telephones. The other terminals are to be used by the installer for

troubleshooting or to replace a bad pair. The J-1077A/U is normally used with multiple subscriber

equipment. (See Figure 1-25.)

43. Another terminal or terminals you might have to install before installation of a telephone set are

the TD-1233/TT and the TD-1234/TT. These two pieces of equipment go with DGM equipment. (See

Figures 1-26, 1-27, 1-28, and 1-29 to view the equipment front and back. You must be familiar with

both sides.)

44. Installation of TD-1233/TT or TD-1234/TT.

a. First we must discuss SAFETY (to the installer and to the equipment).

(1) Remove all jewelry, to include rings, watches, neck chains, and identification tags. Place

the jewelry in a pocket or another secure place. Failure to do so could cause severe burns or injury to

the installer.

(2) The equipment must be properly grounded prior to connecting power cables, transmission

cables, and telephone wires. Failure to do so could damage the equipment and very possibly jolt the

installer with an electrical shock.

1-29

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Figure 1-25. J-1077A/U

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1-30

Figure 1-26. TD-1234/TT (front).

Figure 1-27. TD-1234/TT (rear).

1-31

SS0441

Figure 1-28. TD-1233/TT (front).

Figure 1-29. TD-1233/TT (rear).

(3) Static discharge from the installer can damage the components located inside the

equipment on the circuit card assemblies (CCAs). Then the equipment will not work. If there is no

spare equipment, the mission cannot be accomplished.

SS0441

1-32

b. Ensure the right equipment is available. To install a TD-1234/TT at the maximum distance

from the AN/TRC-173, eight 1/4-mile reels of CX-11230A/G are needed. That will provide a distance

of 2 miles. A source of power, power cable, and plug is also needed. The equipment does not get its

power from the CX-11230A/G. Ensure the ground rod, ground cable, and a hammer or mallet are

available, and don't forget to protect the eyes with goggles. Ensure there is at least 1/4 mile of WF-16/U

telephone cable to go from the TD-1233/TT to the 4-wire telephone. Any 4-wire telephone

TA-838( )/TT, TA-954/TT, or TA-341/TT will work on this equipment. The TL-13 is needed to prepare

the wire ends to fit into the TD-1234/TT and the telephone.

45. In the old days, the Army used large switchboards in an area and all telephones were wired

through it. Now the units are dispersed and only a few telephones go into an area. The TD-1234/TT

will permit the use of up to eight telephones. The TD-1234/TT will accept the signal from the telephone

and mix it or multiplex it to be technical, and send all signals out as one signal to the van where it is sent

on its way.

46. The TD-1234/TT will also provide remote power to another piece of equipment-the TD-1233/TT.

This unit can handle four telephones at one time and can be placed up to 2 miles from the TD-1234/TT.

The telephones can also be up to 1/4 mile from the TD-1233/TT.

47. Both units, the TD-1233/TT and TD-1234/TT, will provide the installer with an analog order wire

system. Using the test set telephone TS-3647/G, the installer can then troubleshoot the system from the

TD-1233/TT all the way back to the van.

48. The TD-1234/TT requires 115 V AC. It has an internal power supply to change it to the proper

operating voltages needed for the circuit cards. It also has another power supply to provide the remote

voltage needed for the TD-1233/TT. The TD-1233/TT will operate on voltages of 28 V DC or 180 V

DC.

49. The front panel controls are used to turn the unit on and to let the installer know when there is a

problem. There is an ALARM SMY indicator, ALARM LOI indicator, ALARM POWER SUPPLY

indicator, ALARM TEST pushbutton, a main POWER BREAKER circuit breaker, a power lamp, a

REMOTE POWER OUT ON/OFF toggle switch, power ON/OFF toggle switch, and a REMOTE

POWER OUT indicator.

50. There are up to 16 circuit cards inside that do all the work. They provide power, remote power,

and process the telephone signals. In positions A9 through A12, you can interchange the cards. If you

are installing digital telephones such as TA-954/TT or KY-68, you need a loop modem (LP MDM) card.

If you are installing a TA-341/TT or a TA-838( )/TT, you need an analog applique unit (AAU) circuit

card. You can mix or match the cards depending on the telephone. (See Figure 1-30 for circuit card

locations. Note that positions A9 through A12 can handle two telephones that are the same.)

1-33

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Figure 1-30. Circuit card location.

51. Operational requirements.

a. Ground the equipment immediately.

b. Ensure all switches are off.

c. Connect the CX-11230A/G to the rear of the TD-1234/TT. It is connected to HIGH GROUP

if going to the next unit or to the terminal AN/TRC-173. It is connected to LOW GROUP if it is going

down to another TD-1234/TT or a TD-1233/TT. (See Figure 1-27.)

d. Collect power to the TD-1234/TT. Place main POWER switch in the ON position. The

power lamp lights. After a 5-second warmup, all alarm lamps should be off.

e. Connect the TS-3647/G and test the order wire system. It is connected to the ORDER

WIRE HIGH GROUP if it is going to the AN/TRC-173, or to the ORDER WIRE LOW GROUP if it is

going down to another TD-1234/TT or TD-1233/TT.

f. Perform a built-in test equipment (BITE) test. Press and release the ALARM TEST switch.

All fault and alarm lamps on the front panel and on CCAs A6 through A16 are operational.

g. If a fault is detected, turn the main POWER switch to OFF. Reset the CCA. Turn the main

POWER switch to ON. If the fault is not resolved by resetting the CCAs, you should replace the entire

unit.

SS0441

1-34

h. If the unit is completely operational, use WF-16/U and connect a telephone set to the proper

position; turn on the switch on that circuit card and place a call. Be sure to connect the wires to the

telephone first.

i. When you connect the WF-16/U to the rear of the TD-1234/TT or the TD-1233/TT, the wires

are reversed. Push in on the connector; place the end of the wire in the slot, be sure it is snugly in place.

If you connected the wires to the OUT connector, then you must place the other end of those wires in the

RECEIVE connectors on the telephone. Wires connected to the IN connectors must be connected to the

TRANSMIT connectors on the telephone. Go around to the front of the TD-1234/TT, look at CCA in

position A9 if you connected the wires to CHAN 1 and turn the switch on the top to the ON position. If

no telephone is connected to a CHAN connector, the switch on the CCA must be in the OFF position

(See Figures 1-31, 1-32, and 1-33.)

NOTE: If the CCA in A9 is an AAU, the switch should be in NORMAL. If the CCA in

A9 is an LP MDM, you would turn the switch to ON.

1-35

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Figure 1-31. TA-341( )/TT DGM installation.

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1-36

Figure 1-32. TA-838( )/TT DGM installation.

1-37

SS0441

Figure 1-33. TA-954/TT DGM installation.

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1-38

52. Now you know what must be done to make the TD-1234/TT operational. If you have access to the

equipment needed, install the CX-11230A/G, the TD-1234/TT, WF-16/U, and a telephone. Don't forget

to make an order wire check on the TS-3647/G.

1-39

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THIS PAGE INTENTIONALLY LEFT BLANK

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1-40

LESSON 1

PRACTICE EXERCISE

The following items will test your grasp of the material covered in this lesson. There is only one correct

answer for each item. When you complete the exercise, check your answers with the answer key that

follows. If you answer any item incorrectly, study again that part of the lesson which contains the

portion involved.

1.

What type batteries does telephone set TA-312/PT use?

A.

BA-20

B.

BA-2030

C.

BA-3020

D.

BA-30

2.

In what mode of operations must you use the PRESS-TO-TALK switch on telephone set TA-

312/PT?

A.

LB, CB

B.

LB, CBS

C.

CB, CBS

3.

How much insulation is removed from the wire before connecting it to the telephone?

A.

1/4 inch

B.

1/2 inch

C.

3/4 inch

D.

1 inch

4.

Is it possible to operate the telephone set TA-312/PT without batteries?

A.

Yes

B.

No

5.

Where is the deicing screen installed?

A.

Outside the transmitter

B.

Inside the transmitter

C.

Outside the receiver

D.

Inside the receiver

1-41

SS0441

6.

What is the purpose of the HOOKSWITCH

A.

Connects the H-144( )/U to the line

B.

Connects the H-60/PT to the line

C.

Connects to the distant party

D.

Connects to a switchboard

7.

In performing the preinstallation check, to which terminals do you connect the 1000-ohm

resistors?

A.

R-B, G-Y

B.

B-G, R-Y

C.

G-Y, R-G

8.

When operating in the POINT-TO-POINT mode, in which position is the LB/CB switch?

A.

AC/CB

B.

DC/CB

C.

LB

9.

Which terminals on the C42 connector block are the transmit terminals?

A.

R and Y

B.

Y and B

C.

B and R

D.

B and G

10.

How many extensions may be installed using the TA-341?

A.

Four

B.

Five

C.

Six

D.

Seven

11.

Which key on the keysender pad is designated IMMEDIATE?

A.

1

B.

2

C.

3

D.

4

SS0441

1-42

12.

How do you reach the operator for assistance?

A.

0

B.

12

C.

110

D.

111

13.

Which battery is used with the TA-341/TT?

A.

BA-30

B.

BA-32

C.

BA-40

D.

BA-42

14.

What is the purpose of the R key?

A.

To recall the operator

B.

To recall the last party

C.

To recall a conference

D.

To make a ROUTINE call

15.

Which pair of wires are the transit wires on telephone cable WF-16/U?

A.

Yellow

B.

Red

C.

Green

D.

Brown

16.

The MODE SELECT switch is in DC/LB. From what source does the telephone get its power?

A.

Another instrument

B.

Internal batteries

C.

The line

D.

Switchboard

17.

You have two extensions installed on the line. When will the line be considered on-hook?

A.

When all instruments are in use

B.

When all instruments are not in use

C.

When one instrument is in use

D.

When the mainline and extensions are in use

1-43

SS0441

18.

The telephone is installed in a vertical position. You are checking the batteries. Which batteries

should have the negatives on the top?

A.

The ones on the bottom

B.

The ones on the left

C.

The ones on the right

D.

The ones on the top

19.

How many positions are on the MODE SELECT switch?

A.

Two

B.

Four

C.

Six

D.

Seven

20.

What type batteries does the TA-838( )/TT use?

A.

BA-30

B.

BA-32

C.

BA-40

D.

BA-42

21.

Where are the wires connected for 2-wire operation?

A.

To XMIT

B.

To RCV

C.

One to XMIT and one to RCV

22.

What is the value of the resistors needed to check the TA-838( )/TT?

A.

100 ohms

B.

500 ohms

C.

1000 ohms

D.

1500 ohms

23.

The telephone set is located less than 4 miles from the switchboard. Which type of supervision

can be used?

A.

AC

B.

DC

C.

LB

D.

DTMF

SS0441

1-44

24.

Why would the user use the R key?

A

For redialing the last number

B.

For recalling the operator

C.

For redialing a previous number

D.

For entering a most often dialed number

25.

To perform a preinstallation check on the TA-838( )/TT, the MODE SELECT switch must be

properly set. To which position should you set it?

A.

2-W DC/LB

B.

4-W DC/LB

C.

4-W AC/CB

D.

4-W AC/LB

26.

What type signal does the TA-954/TT transmit and receive?

A.

Amplitude modulated

B.

Conditioned diphase-modulated

C.

Frequency modulated

D.

Single sideband

27.

What is the source of power for the DNVT?

A.

BA-30

B.

BA-42

C.

Common battery

D.

Local power source

28.

What type wire is used to connect the TA-954/TT?

A.

WF-1( )/TT

B.

WF-16/U

C.

W-104

D.

W-108

29.

With what type equipment does the TA-954/TT interface?

A.

Analog

B.

PCM

C.

Digital

D.

FM

1-45

SS0441

30.

How many terminal connections for 2-wire telephones are in the J-1077A/U?

A.

8

B.

13

C.

26

D.

52

31.

What is the power requirement for the TA-1035/U?

A.

12 V DC

B.

24 V DC

C.

36 V DC

D.

48 V DC

32.

How many channels are available on the TD-1234/TT?

A.

2

B.

4

C.

8

D.

16

33.

To which CCA in the TD-1234/TT would you turn on the power if you connected a telephone

TA-954/TT to channel 5?

A.

A9

B.

A10

C.

A11

D.

A12

34.

What is the power requirement for a TD-1234/TT?

A.

28 V DC

B.

115 V AC

C.

115 V DC

D.

180 V DC

35.

What safety procedure must you do first when installing a TD-1234/TT?

A.

Connect the power cable

B.

Connect the CX-11230A/G

C.

Ensure all switches are off

D.

Ground the equipment

SS0441

1-46

36.

What is the maximum distance from an AN/TRC-173 to a TD-1234/TT?

A.

2 miles

B.

1 mile

C.

1/2 mile

D.

1/4 mile

37.

How many channels are available on the TD-1233/TT?

A.

2

B.

4

C.

8

D.

16

1-47

LESSON 1

PRACTICE EXERCISE

ANSWER KEY AND FEEDBACK

Item

Correct Answer and Feedback

1.

D.

BA-30 (page 1-4, para 5)

2.

B.

LB, CBS (page 1-7, para 12)

3.

D.

1 inch (page 1-4, para 6d)

4.

A.

Yes (page 1-7, para 13d)

5.

A

Outside the transmitter (page 1-5, para 7)

6.

B.

Connects the H-60/PT to the line (page 1-6, Table 1-1)

7.

A.

R-B, G-Y (page 1-10, para 19)

8.

C.

LB (page 1-9, Table 1-2)

9.

D.

B and G (page 1-10, para 20a)

10.

A.

Four (page 1-14, para 24)

11.

B.

2 (page 1-13, para 21d)

12.

A.

0 (page 1-12, para 21c)

13.

D.

BA-42 (page 1-8, para 16)

14.

A.

To recall the operator (page 1-12, para 21c)

15.

C.

Green (page 1-10, para 20a)

16.

B.

Internal batteries (page 1-9, Table 1-2)

17.

B.

When all instruments are not in use (page 1-24, para 34b)

18.

D.

The ones on the top (page 1-21, Figure 1-16)

19.

D.

Seven (page 1-22, Figure 1-17)

20.

D.

BA-42 (page 1-15, para 27e)

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1-48

Item

Correct Answer and Feedback

21.

A.

To XMIT (page 1-16, para 28e)

22.

C.

1000 ohms (page 1-22, para 30d)

23.

B.

DC (page 1-15, para 27b)

24.

B.

For recalling the operator (page 1-15, para 26)

25.

D.

4-W AC/LB (page 1-22, para 30a)

26.

B.

Conditioned diphase-modulated (page 1-25, para 36)

27.

C.

Common battery (page 1-25, para 37)

28.

B.

WF-16/U (page 1-26, para 38c)

29.

C.

Digital (page 1-25, para 37)

30.

C.

26 (page 1-29, para 42 and page 1-30, Figure 1-25)

31.

D.

48 V DC (page 1-29, page 41)

32.

C.

8 (page 1-31, Figure 1-27)

33.

C.

All (page 1-34, Figure 1-30)

34.

B.

115 V AC (page 1-33, para 48)

35.

D.

Ground the equipment (page 1-29, para 44a(2))

36.

A.

2 miles (page 1-33, para 44b)

37.

B.

4 (page 1-32, Figure 1-29)

1-49

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LESSON 2

MAINTENANCE

Critical Tasks: 113-588-3021

113-600-3020

OVERVIEW

LESSON DESCRIPTION:

In this lesson, you will learn to perform unit level maintenance on a tactical telephone and the

multiplexer-combiner TD-1234/TT.

TERMINAL LEARNING OBJECTIVES:

ACTION:

The student will perform unit level maintenance on tactical telephone TA-838( )/TT.

CONDITION:

If you do not have access to the equipment, you only need this subcourse. If

available, you will need telephone set TA-838( )/TT (two each), batteries BA-42

(eight each), TE-33, WF-16/U, soft lint-free cloth, dust brush, pencil, DA Form 2404,

DA Pam 738-750, and a training area.

STANDARD:

Upon completion of this subcourse, you will know how to perform unit level

maintenance on a TA-838( )/TT and complete DA Form 2404.

ACTION:

The student will perform unit level maintenance on a multiplexer-combiner TD-

1234/TT and complete a DA Form 2404.

CONDITION:

If you do not have access to the equipment, you only need this subcourse. If

available, you will need DA Form 2404, TD-1234/TT, DA Pam 738-750, soft lint-

free cloth, dust brush, pencil, and a training area.

STANDARD:

Upon completion of this subcourse, you will know how to perform maintenance on

the multiplexer TD-1233/TT and the multiplexer-combiner TD-1234/TT.

REFERENCES: The material contained in this lesson was derived from TM 11-5805-650-12 and TM

11-5805-707-12.

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INTRODUCTION

Telephones and associated equipment, as used daily, will get dirty and sometimes worn badly. Unit

level maintenance is performed to keep the equipment in top condition. Failure to properly maintain the

equipment will mean it may not be ready when you must install it.

PART A - UNIT LEVEL MAINTENANCE ON TACTICAL TELEPHONES

1.

The maintenance allocation chart in TM 11-5805-650-12 indicates that the unit maintainer can

inspect, service, install, replace, test and repair certain items on the telephone. Those items and the

items in the operator/crew preventive maintenance checks and services (PMCS) chart will be discussed.

(See Figure 2-1.)

2.

First we will look at each item on the chart. The letters B, D, A, W, and M have a definite

meaning. They are--

B

Before operation

D

During operation

A

After operation

W

Weekly maintenance

M

Monthly maintenance

3.

Figure 2-1, item number 1 shows that the binding posts are being checked. This is important

because if the binding posts do not hold the wires securely, there is a good possibility that

communications will not be possible. Be sure to also check that each binding post has a rubber cover on

it. This is to protect the operator from electrical shock.

4.

Item number 2 shows the battery compartment being checked. There should be no foreign matter

in the compartment. The contacts should be shiny clean and the springs should have some bounce to

them. Corrosion is a bad element to find in the battery compartment. It means someone forgot to

remove the batteries after the last time the telephone was used. Be sure the thumb knob works

smoothly.

5.

Item number 3 shows the handset and the cord fastened to it are being checked. It should not be

twisted and should still have the spring inside working, causing the cord to retract. The cord should

show no signs of wear, cracks, or frays. The handset must be checked for cracks. The cover on the

transmitter and ear piece are on finger-tight and the holes are clean.

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2-2

6.

Item number 4 shows the carrying sling and tie-down strap are being checked. There should be no

signs of wear or fraying, snaps or latches are firmly in place, and metal connectors and ends are clean

and in place. Also make sure that where the sling and strap are attached to the telephone, the screws are

tight and the connectors are working.

7.

Item number 5 requires an operational check on the telephone. It is easiest to check this with

another telephone. Make sure the buzzer works, the ring indicator lights, and you can talk and hear on

the telephone.

8.

Item number 6 requires a check in DA Pam 25-30 to see if any modifications are due on the

telephone.

9.

Once you have performed the maintenance on the telephone, you must then make a record of the

work you did. To do this, you need to use DA Form 2404. If you are unsure on how to fill in the

heading of the form, refer to DA Pam 738-750.

2-3

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Figure 2-1. Operator/crew preventative maintenance checks and services.

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2-4

Figure 2-1. Operator/crew preventive maintenance checks and services (continued).

2-5

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Figure 2-1. Operator/crew preventive maintenance checks and services (continued).

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2-6

Figure 2-1. Operator/crew preventive maintenance checks and services (continued).

2-7

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Figure 2-1. Operator/crew preventive maintenance checks and services (continued).

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2-8

PART B - UNIT LEVEL MAINTENANCE ON TELEPHONE TERMINALS

10. Unit level maintenance starts with the operator of the equipment. The operator installs the

equipment and connects the telephones. When the equipment doesn't perform as expected, the operator

tests the equipment to determine what went wrong. So operator maintenance is a must.

11. Operator maintenance for the multiplexer-combiner is performed on a weekly basis. (TM 11-

5805-707-12 identifies the maintenance that is to be performed.)

12. PMCS is performed to ensure the equipment is mission ready and to keep serious problems from

suddenly happening. PMCS should be performed weekly if--

a. You are the assigned operator and have not operated the item since the last weekly PMCS.

b. You are operating the equipment for the first time.

NOTES: Use your PMCS chart to get the number for the TM Item Number column of

DA Form 2404 when recording results of PMCS. (See Figure 2-2.)

If the equipment must be in operation all the time, check and service those items that can

be checked and serviced without disrupting operation. Make the complete checks and

services when the equipment can be shut down or when order wire channels are

available.

c. You would perform before maintenance prior to installation.

13. Routine checks are not listed as PMCS and should be performed as the need arises. Some routine

checks are--

Cleaning

Washing

Dusting

Checking for frayed cables

Storing items not in use

Covering unused receptacles

Checking for loose nuts, bolts, and screws

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14. Following are two charts that will provide a clear understanding of your PMCS responsibilities.

(See Figures 2-2 and 2-3.)

Figure 2-2. Operator PMCS chart (TD-1233/TT).

15. Organizational PMCS will most likely be performed by the installer. In Figure 2-3, you will notice

that the organizational maintenance is the same. So you should familiarize yourself with both charts to

ensure you know the required maintenance for the multiplexer-combiner TD-1234/TT. The same

maintenance will be required for the multiplexer TD-1233/TT.

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2-10

Figure 2-3. Organizational PMCS chart (TD-1233/TT).

16. If you have access to the equipment needed, perform both operator and organizational PMCS on a

multiplexer-combiner TD-1234/TT.

2-11

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LESSON 2

PRACTICE EXERCISE

The following items will test your grasp of the material covered. in this lesson. There is only one

correct answer for each item. When you complete the exercise, check your answers with the answer key

that follows. If you answer any item incorrectly, study again that part of the lesson which contains the

portion involved.

1.

The unit maintainer performs maintenance on the assigned equipment. Where does he get the

information on when to perform maintenance?

A.

Maintenance allocation chart

B.

Maintenance authorization chart

C.

PMCS chart

D.

Troubleshooting chart

2.

Which publication will identify modification for the equipment?

A.

DA Pam 25-30

B.

DA Pam 25-310

C.

DA Pam 30-25

D.

DA Pam 310-4

3.

Which manual would you find the PMCS chart for the TD-1234/TT?

A.

TM 11-5805-707-12

B.

TM 11-5805-707-10

C.

TM 11-5850-707-12

D.

TM 11-5850-707-10

4.

Which is identified as a routine check?

A.

Alarms

B.

Lamps

C.

Receptacles

D.

Switches

5.

Upon completion of maintenance, an operational check is usually required. Which item on the

PMCS chart for the TA-838( )/TT requires this check?

A.

3

B.

4

C.

5

D.

6

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2-12

6.

All maintenance checks and services are performed. On what document do you record this

information?

A.

DA Form 2404

B.

DA Form 2405

C.

DA Form 2407

D.

DA Form 2409

7.

Which publication will provide information on the completion of maintenance forms?

A.

DA Pam 738-750

B.

DA Pam 738-760

C.

DA Pam 750-738

D.

DA Pam 760-738

2-13

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LESSON 2

PRACTICE EXERCISE

ANSWER KEY AND FEEDBACK

Item

Correct Answer and Feedback

1.

C.

PMCS chart (page 2-2, para 1)

2.

A.

DA Pam 25-30 (page 2-3, para 8)

3.

A.

TM 11-5805-707-12 (page 2-9, para 11)

4.

C.

Receptacles (page 2-9, para 13)

5.

C.

5 (page 2-3, para 7)

6.

A.

DA Form 2404 (page 2-3, para 9)

7.

A.

DA Pam 738-750 (page 2-3, para 9)

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2-14

Table of Contents

Part A

Part B:

Part C:

Part D:

Part E:

Part F:

Part A:

Part B: