STELMA TH-42/UG Technical Manual

Telegraph repeater

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N A V SHIPS 93742

f 5 ')II

DE P A RTM

C O NT RACT:

N O B SR 81555

TE C HNICAL

MANUAL

for

:;--

TE L IDRAPH REPE A TER,

MO D EL T H -. 42/UG

(

�

STE L MA, Incorporated

200 Henry Street

Stamford, Connecticut

L J

E N T

B U R

E A U

0 F

APPR O V ED BY BUSHIPS: 13 OCT O B ER 1960

(Non-Registered)

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S H I P S

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Page 1 (Non-Registered) N A V SHIPS 93742 TE C HNICAL MANUAL 'l3?1ll. f 5 ')II :;-- TE L IDRAPH REPE A TER, MO D EL T H -. 42/UG � STE L MA, Incorporated 200 Henry Street Stamford, Connecticut , , ' l ' i �...
Page 3: Table Of Contents
FRONT MATTER NAVSHIPS-93 ? 42 CONTENTS TABLE OF CONTENTS SECTION 1. GENERAL INFORMATION Paragraph Page Scope Purpose General Description Technical Characteristics SECTION 2. INSTALLATION Unpacking Installation Loop Connections Initial Adjustments and Checks SECTION 3 . OPERATOR'S SECTION General Capabilities and Limitation Operation of Each Function PRINCIPLES OF OPERATION SECTION 4.
Page 5 NAVSHIPS-9J742 FRONT MATTER CONTENTS LIST OF ILLUSTRATIONS SECTION 1. GENERAL INFORMATION Figure Page Telegraph Repeater, Model TH-42/UG SECTION 2. INSTALLATION Telegraph Repeater, Model TH-42/UG, Connections to loops. SECTION 4. PRINCIPLES OF OPERATION Telegraph Repeater, Model TH-42/UG, 4- 1 Schematic. PREVENTIVE AND CORRECTIVE MAINTENANCE SECTION 6.
Page 6: Navships-93
Figure NAVSHIPS-93742 TH-42/UG GENERAL INFORMATION � FIGURE 1-1 TELEGRAPH REPEATER. MODEL TH-42/UG 1-0/...
Page 7 1-1. Scope This publication describes the installation, operation, theory of opera tion, and operator's, preventive and corrective maintenance for Telegraph Repeater TH-42/UG, STELMA l'lodel TR-2B (fig. 1-1), hereafter referred to as the Repeater. 1-2. Purpose and Use The Repeater is an in-line device, designed for 1-way reversible operation;...
Page 8: General Information
Paragraph NAVSHIPS-93742 TH-42/UG GENERAL INFORMATION EFFECTIVE MARK INPUT OR 425 ohms (±5%) OUTPUT IMPEDANCE FOUR WIRE SERVICE (Per Loop); Input 270 ohms, 20-ma loop; 90 ohms, 60-ma loop. O utput 330 ohms, (mark). KEYING SPEED Up to 150 cps ( 300 baud).
Page 9: Paragraph
1-1. Scope This publication describes the installation, operation, theory of opera tion, and operator's, preventive and corrective maintenance for Telegraph Repeater TH-42/UG, STELMA Model TR-2B (fig. 1-1), hereafter referred to as the Repeater. 1-2. Purpose and Use The Repeater is an in-line device, designed for 1-way reversible �·...
Page 10 Paragraph NAVSHIPS-93742 TH-42/UG GENERAL INFORMATION EFFECTIVE MARK INPUT OR 425 ohms (±5%) OUTPUT I MPEDANCE FOUR WIRE SERVICE (Per Loop); Input 270 ohms, 20-ma loop; 90 ohms, 60-ma loop. O utput 330 ohms, (mark). KEYING SPEED Up to 150 cps (300 baud).
Page 11: Installation
TH-42/UG NAVSHIPS-93742 Paragraph INSTALLATION SECTION 2 INSTALLATION 2-1. Unpacking The Repeater is packed in a heavy cardboard carton; no special in structions are required for unpacking. Upon removal, inspect the unit for damage. All tubes and transistors are in their sockets, and the unit is ready for installation.
Page 13: Initial Adjustments And Checks
TH-42/UG Paragraph NAVSHIPS-9.3742 INSTALLATION to 4W or 2W OPERATION. (Fig. 2-1). Remove jumper between terminals. Remove 4WSA- 4WRB+ jumper between 4WSB- and terminals. (The designation 4WSA refers 4WRA+ to the sending end of the loop; refers to the receiving end of a 4WRA loop.
Page 14 NAVSHIPS-93742 TH-42/UG Paragraph 2- 4 INSTALLATION Connect a milliammeter (0-100 rna) to the W LOOP CUR. jack on the panel, using a plug with positive circuit connection on the tip. Adjust loop current for exactly 60 (or 20) rna. Connect milliammeter to the E LOOP CUR. jack, and proceed as outlined in Step�., above, to adjust E loop current.
Page 15 NAVSHIPS-93742 Paragraph TH-42/UG OPERATOR'S SECTION 3- 1 SECTION 3 OPERATOR'S SECTION 3-1. General Upon installation (par. 2-2), operation of the Repeater is automatic. Assuming that the loop currents have been checked (par. 2-4) and that the marking condition exists in both E and W loops, either side may transmit immediately to the other side.
Page 16: Operator's Section
Paragraph NAVSHIPS-93742 TH-42/UG OPERATOR'S SECTION Since the Repeater inputs are isolated from ground and from one another, the Repeater loops may be floating or grounded on either leg. If there is an option for grounding, it is recommended that the negative terminal of the 2W loop-connection to the Repeater be grounded, (this would be the 4WRB- and 4WRA- terminals for 4-wire service).
Page 17: Principles Of Operation
NAVSHIPS-93742 Paragraph TH-42/UG PRINCIPLES OF OPERATION SECTION 4 PRINCIPLES OF OPERATION 4-l. General Figure 4-l, a schematic of the 2-way Repeater, illustrates two Repeaters (one across the upper part, and the other across the lower part of the figure) which are identical in configuration and operation when...
Page 19 NAVSHIPS-93742 Paragraph TH-42/UG PRINCIPLES OF OPERATION LOOP OSCILLATOR. Assuming transmission from E to W, the loop �· current produces a voltage drop across This voltage is applied to transistor oscillatbr Ql, utilizing transformer Tl in a feedback cir cuit to produce a high audio-frequency oscillation.
Page 23: Routine Maintenance
Paragraph NAVSHIPS-93742 AND CORRECTIVE MAINTENANCE SECTION CORRECTIVE MAINTENANCE Routine Maintens.nce 6-1. Perform the checks listed l.n :paragraph perfom 5-l; to described in paragraph 5-l, c., use a signal source (into the Repeater) low distortion, such as from a Teletype having DID4 (TS 383).
Page 24: Repeater Troubleshooting And Repair
Paragraph NAVSHIPS-93742 TH-42/UG PREVENTIVE AND CORRECTIVE MAINTENANCE Check the quality of the signal at the input to the Repeater. Check the signal at the output of the Repeater. Check the signal at the remote receiving end. Identify the point where the signal deteriorates.
Page 25 NAVSHIPS-93742 TH-42/UG Figure PREVENTIVE AND CORRECTIVE MAINTENANCE FIGURE 6-1 INSIDE VIEW ORIGINAL...
Page 26 NAVSHIPS-93742 TH-42/UG Paragraph 6- 5 PREVENTIVE CORRECTIVE MAINTENANCE With about 10 volts across the capacitor check that the cathode of is positive the grids of V3 are positive (3 to volts). Failure this indicates defective R5, R8, R9, RlO, C4, Vl, or V2.
Page 28 NAVSHIPS-93?42 Paragraph TH-42/UG PREVENTIVE AND CORRECTIVE MAINTENANCE Connect a telegraph distortion analyzer (such as the TS-917/GG) £. in the LOOP CUR. jack, and set up the unit to measure bias distortion. !QI! Make sure loop currents are correct (par. 5 -l b.), before adjustments are made.
Page 29 7-1. General An equipment parts list for Telegraph Repeater 42/UG (serial number and up) follows. The items are listed according to reference symbol brief description and the STELMA part number. number, each followed by PARTS LIST Ref. ELMA Part No.
Page 32 T H-42/UG NAVSHIPS-93?42 Paragraph PARTS LIST PARTS LIST STELMA Ref. Part No. Resistor, Fixed, Comp, 100,000 100RC104 ohms, lW, Same as R? Resistor, Fixed, Comp, 1 meg., 0.50RC10.5 Same as R.5 0.50RC7.54 Resistor, Fixed, Comp, 7.50,000 ohms, 1/2 =.5% 0.50RC.564 Resistor, Fixed, Comp, .560,000...
Page 33 NAVSHIPS-9.3742 TH - 42/UG Paragraph PARTS LIST PARTS LIST STELMA Ref'. Part No. Same as R6 Same as R5 Same as R5 Same as R12 1t28 Same as Rll Same as R5 Same as R5 Same as R15 R.32 R 3 .3...
Page 34 NAVSHIPS-93742 TH-42/UG PARTS LIST PARTS LIST STELMA Ref'. Part No. Not Used T:Bl 10PJ18.5 Terminal, Strip, Barrier T:B2 17VT100 Electron Tube, Miniature Twin-Triode Same as Vl l?VTllO Electron Tube, Miniature Twin-Triode Same as Vl Same as Vl Same as V3 1.5FS122...
Page 35 N AVSHIPS-93742 Paragraph TH-42/UG PARTS LIST 7 -1 PARTS LIST STELMA Ref. Dee criJ2t1 on Part No. Same as XV.3 Socket, Pin Min. Ceramic 18MH126 Same as Same Same as XV-' ORIGIHAL '!-6...