INSTRUCTION B

SELECTIVE AND

WIDEBAND VOLTMETER

476J-l

TEST EQUIP. SECTION

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476J-l

INSTRUCT ON B

SELECTIVE AND

WIDEBAND VOLTMETER

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COLLINS RA iO co.----- COLLINS RADIO COMPANY -1)

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GUARANTEE

The equipment descnbed herein is sold under the follovnng guarantee:

Collws agrees to repalr or replace, without charge, any equipment, parts, or accessories which are de­fective as to desq;n, workmanship or material, and which are returned to Collins at its factory, transportationprepaid, provided

(a) Notice of the claimed defect is given Collins within one (1) year from date of delivery and goods arereturned w accordance with Collins' instructions.

(b) Equipment, accessories, tubes, and batteries not manufactured by Collins or from Collins' designsare subject to only such adjustments as Collins may obtain from the supplier thereof.

(c) No equipment or accessory shall be deemed to be defective if, due to exposure or excessive moisturein the atmosphere or otherwise after delivery, it shall fail to operate in a normal or proper manner.

Collins further guarantees that any radio transmitte r desc ribed 'herein will deliver full radio frequency poweroutput at the antenna lead when connected to a suitable load, but such guarantee shall not be construed as aguarantee of any deftnite coverage or range of said apparatus.

The guarantee of these paragraphs is void if equipment is altered or repaired by others than Collins or itsauthorized service center.

No other warranties, expressed or implied, shall be applicable to any equipment sold hereunder, and theforegoing shall constitute the Buyer's sole right and remedy under the agreements in this paragraph contajned.In no event shall Collins have any liability for consequential damages, or for loss, damage or expense directlyor indirectly arising from the use of the products, or any inability to use them either separately or in combinationwith other equipment or materials, or from any other cause.

HOW TO RETURN MATERIAL OR EQUIPMENT. U, for any reason, you should wish to returnmaterial or equipment, whether under the

guarantee or otherwise, you should notify us, giving full particulars including the details listed below, insofar asapplicable. U the item is thought to be defective, such notice must give full information as to nature of defectand identification (including part number if possible) of part considered defective, (With respect to tubes wesuggest that your adjustments can be speeded up if you give notice of defect directly to the tube manufacturer.)Upon receipt of such notice, Collins will promptly advise you respecting the return. Failure to secure our adviceprior to the ,forwarding of the goods or failure to provide full particulars may cause unnecessary delay in handlingof your returned merchandise.

ADDRESS:

Collins Radio CompanySales Service DepartmentDallas, Texas

INFORMAnON NEEDED:

(A) Type number, name, and serial number of equipment(B) Date of delivery of equipment(C) Date placed in service(D) Number of hours of service(E) Nature of trouble(F) Cause of trouble if known(G) Part number (9 or 10 digit number) and nameof part

thought to be causing trouble(H) Item or symbol number of same obtained from parts

list or schematic(I) Collins' number (and name) of unit sub-assemblies

involved in trouble(J) Remarks

When ordering replacement parts, you should directHOW TO ORDER REPLACEMENT PARTS. your orderas indicated below and furnish the followinginformation insofar as applicable. To enable us to give you better replacement service, please be sure to giveus complete information.

ADDRESS:

Collins Radio CompanySales Service DepartmentDallas, Texas

INFORMA nON NEEDED:

(AJ Quantity. reqUired(B) Collins' part number (9 or 10 digit number J and de­

scription(C) Item or symbol number obtained from parts list or

schematic(D) Collins' type number, name, and senal number of

principal equipment(EJ Unit sub-assembly number (where appllcableJ

INSTRUCTION BOOK

SELECTIVEAND

WIDEBAND VOLTMETER476J-l

520 5199 0015 September 195959-14REVISED: 15 October 1960

©COLLINS RADIO COMPANY1960

DALLAS, TEXAS, U. S. A.Texas Division

=============== PRINTED IN THI UNITED STATlS Of AMIRICA ========= iiiiiiiiiill2C!!.!O!f,lG~L~IN!!!~CIliiiiIiE

TABLE OF CONTENTS

SECTION PAGE

I GENERAL DESCRIPTION 1

1.1 General 11.2 Equipment Description. 11.3 Unit Characteristics 11. 3. 1 Physical Characteristics 11. 3. 2 Operating Characteristics 11. 3. 3 Electrical Characteristics 1

II INSTALLATION 2

2.1 General 22.2 Unpacking the Equipment 22.3 Installation 22.4 Initial Adjustments. 32.4.1 Primary Power . 3

2.4.2 Adjustments 3

III OPERATION 3

3.1 General 33.2 Controls 3

3.3 Calibration 3

WØCCW

Table of ContentsList of Illustrations

TABLE OF CONTENTS (CONT)

SECTION

III (Cont' d.)

PAGE

3.43.4.13.4.23.53.5.13.5.23.5.33.5.43.5.5

VTVM Measurements (Wideband)RMS LevelsVoltage Ratios .

Selective Voltmeter MeasurementsHarmonic Distortion MeasurementIntermodulation MeasurementsCrosstalk MeasurementAttenuation MeasurementsModulation Characteristics Test

4

4

4556

67

7

IV PRINCIPLES OF OPERATION 8

4.14.24.2.14.2.24.2.34.2.4

GeneralCircuit Description

Input and Amplification800 KC I-F Circuit with Filtering15 KC I-F Circuit with FilteringOutput Circuit

9

9

99

9

10

V MAINTENANCE 10

5.15.25.35.3.15.3.25.3.35.3.45.3.5

5.4

GeneralRecommended Test EquipmentBench Test and Alignment .

Wideband Voltmeter (vtvm) CalibrationSelective Voltmeter Calibration50 KC Oscillator Level CalibrationOutput and Meter Alignment

Normal CalibrationTroubleRhooting

1010101010

11/1211/12

11/1211/12

VI

FIGURE

1-11-23-1

3-2

ii

PARTS LIST

LIST OF ILLUSTRATIONS

Selective and Wideband Voltmeter 476J-lCarrying Case for Selective and Wideband Voltmeter 476J-1Selective and Wideband Voltmeter 476J-l Harmonic Distortion

MeasurementsSelective and Wideband Voltmeter 476J-1, Intermodulation Measurements

19

PAGE

iviv

5

6

FIGCRE

List of Illustrations

LIST OF ILLUSTRATIONS (CONT)

Page

3-3

4-15-15-26-16-2

6-36-4

Selective and Wideband Voltmeter 476J-l, Near-end and Far-end CrosstalkMeasurements .Selective and Wideband Voltmeter 476J-l, Block Diagram .Selective and Wideband Voltmeter 476J-1, Calibration Equipment Assembly.Selective and Wideband Voltmeter 476J-l, Schematic Diagram.Selective and Wideband Voltmeter 476J-l, Side View Cover Removed.Selective and Wideband Voltmeter 476J-l, Top View, Cover RemovedSelective and Wideband Voltmeter 476J-1, Bottom View, Cover Removed, Part 1Selective and Wideband Voltmeter 476J-l, Bottom View, Cover Removed, Part 2

7

8

1013/14

15161718

iii

Section IGeneral Description

RI09

5101

MAIN TUNINGCI31

CI32 FU NCTION 5E LECTOR5105

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M 101

RI50

IT-~CTT---I--R 180

5102 5103 JIOI 5106 5104

B38 877 PbFigure 1-1. Selective and Wideband Voltmeter 476J-1.

838 876 Pb

Figure 1-2. Carrying Case for Selective and Wideband Voltmeter 476J-1.

;v

Section I

General Description

SECTION IGENERAL DESCRIPTION

I

1.1 GENERAL

Selective and Wideband Voltmeter 476J-l is a highlysensitive, selective test instrument which measuresthe voltage level of each frequency component ofcomplex wave forms in the 4- to 750-kc range. As aselective voltmeter, it is used either in the laboratoryor in the field for several types of measurements:(1) harmonic distortion, (2) intermodulation products,(3) crosstalk, (4) attenuation, and (5) modulationcharacteristics tests, relative to electrical filters,cables, or open-wire lines. The frequencies of acomplex wave form are also indicated. As a wide­band electronic voltmeter the 476J-1 measures therms voltage level of a single or composite signal ornoise in the 200-cps to 750-kc range.

1.2 EQUIPMENT DESCRIPTION

The 476J-l consists of four major circuits: (1) anr-f amplifier with an input matching network and alow pass filter, (2) an 800-kc i-f circuit, (3) a 15-kci-f circuit, and (4) a metered output circuit. Seefigure 1-3.

The 476J-1 is a single unit which can be either rack­mounted on standard 19-inch racks or used on abench. It is fitted with removable safety covers andtwo carrying handles. A reinforced wooden carryingcase is available for transporting the unit. Seefigure 1-2.

Standard construction techniques are used on internalwiring with small parts accessible on compositionterminal boards. Critical circuits are enclosed inmetal containers which have removable covers.Tubes are held in place by spring loaded holders.The tuning condensor is ruggedized, vernier-driven,

I and directly calibrated with the tuning dial. The dialis illuminated with two 6. 3-volt a-c pilot lamps.

1.3 UNIT CHARACTERISTICS

1. 3.1 PHYSICAL CHARACTERISTICS

Weight (unit only) :59 pounds

Revised: 15 October 1960

Weight (encased):78 pounds

Size:Width

19 inchesHeight

10 1/2 inchesDepth

12 inchesForward Projection (when rack mounted)

2 1/4 inchesMounting:

Rack mounted or portableFinish:

Chrome plate and tin plate chassisGrey panel

Ventilation:Convection

1. 3. 2 OPERATING CHARACTERISTICS

Ambient Temperature:

-10 0 C(+14°F) to +50°C(+122°F)Ambient Relative Humidity:

o to 90 percentAmbient Altitude:

15,000 feetOperating Duty Cycle:

Intermi ttent, attended

1. 3. 3 ELECTRICAL CHARACTERISTICS

Voltage Requirements:110 volts a-c to280 volts a-c, 42-60 cps,50 volt-amperes (variable)

Input Impedance:Balanced

75-150-600-2K ohms, minimum returnloss 20 db. 30 db minimum balancedattenuation. Up to 500-volt d-c blockingApproximately 50 uuf shunt input capaci­

tanceUnbalanced

75-150-600-20K ohms: minimum returnloss 20 db. Up to 500-volt d-c blocking

1

Section I - IIGeneral Description - Installation

Input Potentiometer:5K-ohm (non-inductive) for full dynamicrange use

Measurement Characteristics:Wide-Band Voltmeter

Voltage10 to 100 millivolts; 1 to 10 volts

Frequency200 cps to 750 kc

Accuracy5 percent (full scale deflection)

Selective Voltmeter:Voltage

10 microvolts to 10 volts (-100 db*to +20 db)

Frequency4 to 750 kc (continuous)

Accuracy10 perce~t (full scale deflection)

SelectivityLess than 4 db attenuation at f ±100cyclesMore than 75 db attenuation at f ±600cycles

Spurious Frequency AttenuationMore than 70 db relative to the highestfrequencies considered

Bandpass200 cps

Image Frequency Attenuation:More than 90 db in operating bandApproximately 30 db from 800 kc to 2.3 mc

Error for ±10 Percent Primary Voltage Varia­

tion:Less than O. 1 db as wideband level meterLess than 0.5 db as a selective voltmeter

, Background Noise:" Approximately 1 microvolt

Calibration:Sensitivity and frequency calibrated bymeans of an internal crystal-controlled50-kc oscillator

Protective Devices:Replaceable fuses

250V, . 375A B+250V, 2A a-c line

Meter:1 milliampere movement, calibrated involts and db

Accessories:Line power cord; headphones

*0 db equal to 0.775 volts across any impedance load

SECTION II

INSTALLATION

2.1 GENERAL

Section II outlines the procedures for unpacking andinstalling the equipment, applying primary power,and instructions pertaining to initial adjustments andcalibration.

2.2 UNPACKING THE EQUIPMENT

Unpack the equipment carefully. Inspect each com­ponent for physical damage. Check the mechanicaloperations of the switches and tuning controls. Ifany defects are found, refer to the inside front cover

2

of this publication for provisional guarantees andshipping instructions. Place the spare parts kiteither in the carrying case cover cabinet or a suit­able parts storage location.

2.3 INSTALLATION

Remove the protective covers by loosening the knurledscrews. Remove all shipping documents and packingmaterial from the instrument. Secure all tubes inthe sockets. Check the pilot lamps on each side ofthe dial assembly. Replace the covers. Check fuseson rear of unit and replace blown or missing fuses.

2.4 INITIAL ADJUSTMENTS

2.4.1 PRIMARY POWER. Attach the line cord con­nector to recessed male input connector P101 on therear chassis. Check the primary power selector onthe rear of the Lmit to ensure that proper a-c oper­ating voltages are applied to the power transformer.

Section II - III

Installation - Operation

2.4.2 ADJUSTMENTS. Follow the procedure out­lined in paragraph 3.3, CALIBRATION, of SectionIII, OPERATION, for the initial adjustments andcalibration of the unit. If these proceduresindicate equipment malfunction, follow the main­tenance procedures outlined in paragraph 5.4,Section V.

3.1 GENERAL

SECTION IIIOPERATION

g. CAL 1 potentiometer R180 is located below themeter; it varies the output of the 50-kc oscillator.

The following paragraphs outline the procedures forcalibrating the 476J-1 and making specific measure­ments. Refer to figure 1-1 and paragraph 3.2 foridentification of controls.

3.2 CONTROLS

Test adjustments are made from the front of the unit.Silk screened labels identify the controls and thevalues of each switch position. There are five rotary,ganged wafer switches; three potentiometers, andtwo variable capacitors.

a. INPUT IMPEDANCE switch S101 is a double­pole, 9-position, 3-wafer, rotary switch, whichvaries the input impedance.

b. INPUT attenuation switch S102 is a double-pole,10-position, rotary switch, which switches in L-padattenuators to attenuate the signal.

c. FREQ RANGE switch S103 is a double-pole,6-position, rotary switch, which selects the correctLC combination for the selected frequency range.

d. SELECTIVE VOLTMETER RANGE switchS104 is a single-pole, 8-position, rotary switch,which switches in series resistance.

e. Function selector switch S105 is a double-pole,6-position, 3-wafer, rotary switch which selects themode of operation.

f. ADJ INPUT potentiometer R109 is located atthe upper left corner; it varies the input impe­dance.

h. CAL 2 potentiometer R156 is located just tothe right of CAL 1; it calibrates the amplifier sectionsused in the selective-voltmeter application.

i, Vernier-driven variable capacitor C131 MAINTUNING knob is located near the dial and is a broad­tuning control.

j. DIAL CAL trimmer capacitor C132 pointerknob is located to the right of the MAIN TUNINGcontrol and is used for calibrating the dial to exactfrequencies.

3.3 CALIBRATION

Follow the steps below in the proper sequence beforeattempting voltage measurements.

a. Connect the line cord to an a-c receptacle andturn the toggle switch on the front panel to the ONposition. Allow the unit five minutes for stabilization.

Transformer primary voltage selectoron rear of chassis must be in properposition to match a-c source voltage.

b. Turn function aelector switch S105 to the CAL1 position.

c. Adjust CAL 1 Potentiometer R180 for an indi­cation of 0 db as shown by meter M10l.

3

Section IIIOperation

d. Set INPUT switch S102, SELECTIVE VOLT­METER RANGE switch S104, and function selectorswitch S105 to the CAL 2 position.

e. Turn FREQ RANGE switch S103 to the 4-60position and the tuning dial to the 50-kc position.

f. Adjust the DIAL CAL control C132 until themeter indicates maximum deflection.

I g. Adjust CAL 2 potentiometer R156 for Odb onmeter M101.

h. Reset the dial to the appropriate test frequencyand the switches to the test positions, as specified inthe following paragraphs.

The instrument is now calibrated for normal meas­urements. If a more accurate frequency calibrationis necessary:

a. Connect a headset to jack J101, markedPHONES.

b. Reset function selector switch S105 to the 50KC XTAL position.

c. Set the dial to the red mark nearest the testfrequency.

d. Adjust DIAL CAL control C132 until a zerobeat is heard in the headset.

e. Reset the dial to the test frequency and setfunction selector switch S105 to the SEL VM position.

3.4 VTVM MEASUREMENTS(WIDEBAND)

The 476J-1 measures single or composite signalrms voltage levels or voltage ratios (in db) over the200-cps to 750-kc spectrum when switch S105 is setin the VTVM position. The measurements can bemade on either balanced or unbalanced two-conductorcircuits.

NOTE

Compare the output impedance of thecircuit under test with the value indicatedby INPUT IMPEDANCE switch S101. Thetwo values should be the same. For verylow level measurements, the input leadsshould be kept as short as possible. Checkall ground connections carefully.

4

3.4.1 RMS LEVELS. Follow the steps below whenmaking vtvm measurements.

a. Calibrate the meter as instructed in paragraph3.3.

b. Set INPUT IMPEDANCE switch S101 to thecorrect position to match the circuit under test.

c. Set INPUT switch S102 to the X10 scale andfunction selector switch S105 to the VTVM position.

d. Connect the circuit being tested to input term­inals E101 and E102 with the center conductor orungrounded lead attached to terminal E101.

e. Adjust INPUT switch S102 for an on-scalemeter indication, and record the indicated voltage(rms).

3.4.2 VOLTAGE RATIOS. Follow this procedurewhen comparing the voltage ratios of two or more

signals in succession.

a. Set INPUT IMPEDANCE switch S101 to the0-5K position and function selector switch S105 tothe VTVM position.

NOTE

This operation fixes the input resistanceof the unit at 5,000 ohms (non-inductive)and prOVides a means of calibrating meterM101 to accurately measure voltage ratiosof different input levels.

b. Apply the signal which has the highest levelof the signals being tested to terminals E101 andE102.

c. Set INPUT switch S102 to the 0 db position andturn ADJ INPUT control R109 for a meter M101 indi­cation of 0 db (0.775 v).

d. Remove the reference voltage (step b) andindiVidually measure the remaining levels on thetest circuit. INPUT switch S102 can be adjusted tomaintain on-scale meter readings as necessary.

To compute the level indicated by the instrument:

a. Record the meter indication in db.

b. Note the position of INPUT switch S102and SELECTIVE VOLTMETER RANGE switchS104.

Revised: 15 October 1960

Section IIIOperation

c. Add the meter indication and the two switchindications algebraically to arrive at the total levelin db: i. e. value in db = -4(meter)-20(S102)-10(SI04) = -:34 db.

c. Connect the output terminals of the networkunder test to input terminals E101 and E102 on the476J-1 and tune MAIN TUNING control C131 to thefundamental frequency.

f. Tune the voltmeter to the second, third,fourth, ... n harmonics, and record the level of each.

e. Increase the signal generator output for a full

scale deflection. Record the level.

The total harmonic distortion is obtained from thefollowing formula:

d. Set INPUT switch S102 to the +20 db positionand SELECTIVE VOLTMETER RANGE switch S104to the 0 db position.

I'{100

2+V

n

x100

2+V

n

2+V

n

2 2 2V + V + V

2 3 4

2 2V +V

2 3

222 2V +V +V +V ...

1 2 3 4

D%=t

3.5 SELECTIVE VOLTMETERMEASUREMENTS

The 476J-1 measures harmonic distortion, intermod­ulation products, crosstalk, attenuation, and modu­lation characteristics when used in the selectivevoltmeter application. The following paragraphsdescribe these measurements. Calibrate the meteras instructed in paragraph 3.3 and perform the

measurements in paragraph 3.4.1, a to e, beforeattempting selective voltmeter measurements. Thelatter ensures that input levels will not overload theinstrument. The instrument has a very narrow band­pass of approximately 200 kc. When making meas­urements in the SEL VM position, rotate the tuningdial slowly to ensure measurement of all signals.Adjust SELECTIVE VOLTMETER RANGE switchS104 to the -60 db range to measure very low level

. signals. Possible errors in measurement can occurwhen other spurious frequencies in the vicinity of1604 to 2350 kc are present. This situation can occurwhen image signals differ in level by less than 30 db.A low-pass filter can be used at the input terminalsto attenuate the spurious frequencies.

3.5.1 HARMONIC DISTORTION MEASUREMENT.Harmonic distortion is measured by recording fun­damental frequency levels in respect to harmoniclevels. Use the test equipment set-up shown infigure 3-1 and follow the steps below in sequence.

a. Perform steps a and b, paragraph 3.4.1.

b. Set function selector switch S105 to the SELVM position.

(Derivative formula: )

V=~'[=1 vI

Measurement of levels differing by as much as 75 dhcan be made by this test. SELECTIVE VOLTMETERRANGE switch 8104 indicates up to -60 db; the meterindicates up to -15 db. If the fundamental frequencylevel is of an inconvenient level for mid-scale meterreadings, a potentiometer can be inserted at the input

AMPLITUDE

T

POTENTIOMETER( OPT 10NAl)

I 4 - TERMINAL i 476J-1I NETWORK ::,4'f---- UNDER TEST >' 0>

I " >

I ' <

I---~-;-l

I lP ,I FilTER :

I :I I

---------'L ..JI OPTIONAL)

U91 010 I

Figure 3-1. Selective and Widcband Voltmeter 476J-1, Harmonic Distortion Measurements.

Revised: 15 October 1960 5

Section IIIOperation

of the 476J-1. High level frequencies outside therange of test frequencies can be filtered by an op­tional filter or selective network inserted betweenthe signal generator and the test circuit. See figure3-2.

and frequency, thus locating the origin of the unde­sirable frequency components. Measurements arelimited on the upper limits by the 476J-l internalnoise voltage, which is approximately 1 microvolt.

3.5.2 I;";TERMODULATIOl:" MEASUREME:t\;TS. Per­form intermodulation measurements in the same wayas outlined above for harmonic distortion measure­ments.

a. Connect the equipment as shown in figure 3-2.

a. Connect the signal generator and selectivevoltmeter as shown by figure 3-3.

b. Adjust the output of the signal generator for alevel of approximately +23 dbm*. It is necessary toprovide a low impedance termination on the geneJOatorin some cases to provide a flat output over the testfrequency. range.

b. Connect the two signal generators shown inthe illustration so the intermodulation products willdiffer by at least 500 cycles. The voltmeter canthen differentiate between the intermodulation pro­ducts.

c. Vary the signal generator across the test spec­trum, at the same time tuning the 476J-l to the signalgenerator frequency.

c. Adjust SELECTIVE VOLTMETER RANGEswitch S104 to the -60 db position for maximums ens itivity .

d. Record the level of each measurable frequencycomponent as indicated by meter MI0l. Intelligiblenear-end cross-talk attenuation measurements up to130 db can be measured.

d. Scan the frequency band carefully and recordthe level of each obs erved signal.

e. Compare the ratio of the intermodulation pro­duct levels to the test tone levels. System specifi­cations determine the degree of permissible inter­modulation distortion.

3.5.3 CROSSTALK MEASUREMENT. The 476J-lis used to measure both near-end and far-end cross­talk on open-wire lines or cables. The variouscrosstalk components can be separated as to level

The instrument can also be used as a very sensitivenull indicator in a bridge type crosstalk meter. Noadditional balancing filters are necessary.

The 476J-l can be used in an actual carrier circuitfor analyzing crosstalk on specific channels. Meas­urements can be made with the meter for purposes ofpinpointing the disturbing frequencies. Headphonescan be used for audible interpretations of the cross­talk.

*0 dbm reference is 1 milliwatt across a 600 ohmtermination.

RELATIVEAMPliTUDE

I

4 - TERMINAL 476J-1I HYBRID NETWORK

TRANSFORMER _ UNDER TEST - 0OR RESISTI VEI NETWORKS

SIGNALGENERATOR

SIGNAL hiGENERATOR

f l

U91 012 I

Figure 3-2. Selective and Widebancl Voltmeter 476J-l, Intermodulation Measurements.

6

Section IIIOperation

e. Insert the headphones in PHONES jack J101. provide on-scale indications. Do not overload theinstrument.

f. Set function selector switch S105 to the PHONESposition.

Attenuation measurem.ents up to 75 db can be madeon band-pass filters.

g. Vary the dial frequency and listen to the chan­nel being tested.

h. Correlate the audible information with the datacompiled by selective voltmeter or vtvm measure­

ments.

3.5.5 MODULATION CHARACTERISTICS TEST.The 476J-l is used to measure the frequenciesand levels of spurious modulation products in multi­channel carrier equipment.

a. Modulate the channel under test with a 1000cps signal.

3.5.4 ATTENUATION MEASUREMENTS

a. Initially set INPUT switch S102 to the +20 db

position.

b. Attach the circuit being tested to INPUT term­inals EI01 and E102.

b. Tp.ne MAIN TUNING control C131 to the test

frequency.

c. Set function selecto.r switch S105 to the SELVM position.

c. Vary INPUT switch S102 and SELECTIVEVOLTMETER RANGE switch S104 in that order to

d. Measure the spurious product frequenciesand levels in the sequence specified in paragraph 3.5.

o4 76J-1

DISTURBED CIRCUIT

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, DISTURBING CIRCUIT nf---------<>--'+-----------,.<-----------------'

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/.....I

r L ----l

: 476J-1 :I I

: 0 ~II IL ....l

r--'

TERMINATION I

SIGNALGENERATOR

U91 011 I

Figure 3-3. Selective and Widehand Voltmeter 476J-l, Near-end and Far-end Crosstalk Measurements.

7

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Section IVPrinciples of Operation

SECTION IVPRINCIPLES OF OPERATION

4.1 GENERAL

IThis section consists of a circuit analysis of thevoltmeter by stages, paralleling the block diagramof 4-1 and the schematic diagram, figure 5-2.

The 476J-1 consists of four major circuits:

a. An r-f amplifier with an input matching networkand a low pass filter.

b. An 800 kc i -f circuit, consisting of an 804 to1550 kc vfo, a ring modulator, an 800 kc band passfilter, a stage of resistance-coupled amplification,and another 800 kc band pass filter.

c. A 15 kc i -f circuit consisting of a 785 kccrystal-controlled oscillator, a ring modulator,a 15 kc band pass filter, a variable attenuator,two stages of resistance-coupled amplification,and a cathode follower.

d. A metered output circuit, consisting ofanother 15 kc band pass filter, three stages ofresistance-coupled amplification with feedback, anda metered output. Refer to figure 5-2 for circuitidentification.

e. A 50 kc crystal-controlled calibrationoscillator.

4.2 CIRCUIT DESCRIPTION

4.2.1 INPUT AND AMPLIFICATION. The 476J-1input is either balanced or unbalanced, dependenton the position of the INPUT IMPEDANCE switchS101. Center INPUT terminal E102 is at groundpotential in the UNBALANCED position. TerminalE103 is at chassis ground potential and canbe used for a test equipment commonground.

The signal is coupled through capacitor C101or transformer T101, INPUT IMPEDANCE switchS101B and S10le to the INPUT attenuator switch,S102. Through a series of switched resistances,R110 through R115, input levels of up to +40 dbcan be measured without overloading the volt­meter. ADJ INPUT potentiometer R109 is a

Revised: 15 October 1960

non-inductive variable resistance which furthervaries the input leveL The signal is coupleddirectly to tube VIOl, a dual-triode untunedresistance-coupled amplifier, and from there tothe center tap of function selector switch S105B.The 476J-1 functions as a vtvm when S105 is inposition 3, and as a selective voltmeter inpositions 1, 2, and 5. The CAL 1 position is ano-signal position. Filter FL101 is a low passfilter which presents a high impedance to signalsabove 750 kc and a low impedance to lowerfrequencies. The signal is applied from the outputof FL10l to the primary windings of ring modu­lator transformer T102.

4.2.2 800 KC I-F CIRCUIT WITH FILTERING.The ring modulator consists of transformers T102and T103, diodes CR101 through CR104, andpotentiometers R127 and R128. The vfo consistsof tube V102, MAIN TUNING capacitor C131, anda series of switched LC circuits; inductors L102through L107 and trimmer capacitors C133, C135,C137, C139, C141, and C143, all switched byFREQ RANGE switch S103. Trimmer capacitorC132 permits accurate calibration of the dialfrequency with respect to the input signalfrequency.

The 800-kc intermediate frequency signal iscoupled from the output of ring modulator trans­former T103 to the input terminals of 800-kc bandpass filter FL102. It is then applied from theoutput of filter FL102 to the grid of tube V103 andfurther amplified. The output from V103 is appliedto another 800 kc bandpass filter and to the secondring modulator. The 800 kc filters pass only a 200cps bandwidth.

4.2.3 15 KC I-F CIRCUIT WITH FILTERING.The 800 kc signal mixes with a 785 kc .signalfrom the crystal-controlled oscillator, tube V104,at the second ring modulator. The 15 kc differ­ence frequency is applied to switched seriesattenuator, SELECTIVE VOLTMETER RANGEswitch S104 and resistors R136 through R14LThe signal is then applied to resistance-coupledamplifiers V105 and V107A, cathode followerV107B, and to the input of the 15 kc band passfilter FL105.

9

Section IV - VPrinciples of Operation - Maintenance

4.2.4 OUTPUT CIRCUIT. The 15 kc signal is ap­plied from the output of FLl05 to terminals 2 and 5of function selector switch Sl05B and to the grid oftube VIOS. The three resistance-coupled amplifiers,

VIOS and VIO 9 further amplify the signal which isthen applied to output meter MlOl or phones throughdetector diodes CRllO and CRlll and switch Sl05A.

SECTION VMAINTENANCE

5.1 GENERAL

Section V, MAINTENANCE, outlines the proceduresfor testing and aligning the Selective Voltmeter476J-1. Read the provisional guarantee on the in­side front cover of this manual before attempting torepair any malfunctions.

5.2 RECOMMENDED TEST EQUIPMENT

e. Turn the function selector switch Sl05 to theVTVM position.

f. Adjust rheostat R190 for a meter lVIlOl indi­cation of 0 db on the 476J-1

WARNING Ia. Oscillator, Hewlett-Packard 200CD.

b. Vacuum tube voltmeter, Hewlett-Packard 400D.

c. Oscilloscope, Dumont 304H.

5.3 BENCH TEST AND ALIGNMENT

Operation of this equipment involves vol­tages that are dangerous to life. Whenperforming maintenance operations,special care must be taken to avoid con­tact where high voltage is present. RE­MOVE PRIMARY POWER before changingtubes.

5.3.2 SELECTIVE VOLTMETER CALIBRATION

c. Tune the instrument to the 50 kc dial indica­tion for a maximum meter deflection.

U91 009 I

I

j

476J-1SELECT I\IE

\lOLTMETEPo4000\IT\lM

II 0

200COOSC

600.n.

a. Turn function selector switch S105 to theSEL VM position.

I

I'------f---'----1- '-+--_.~ I

- L---+--f-----------j~I 0

d. Adjust CAL 2 potentiometer R156 for a 0 dbindication on the meter.

b. Turn FREQ RANGE switch S103 to the 4 - 60kc position.

b. Connect an oscillator and a vtvm to the inputof the 476J-1 set at 600 ohms unbalanced as shownin figure 5-1. Place a 600-ohm load terminationacross the line.

a. Remove the bottom cover plate from the in­strument by loos ening the two knurled thumb screws.

5.3.1 WIDEBAND VOLTMETER (VTVM)CALIBRATION

c. Adjust the oscillator for 50 kc and an indi­cation of 0 db on the vtvm.

d. Turn the INPUT switch Sl02 to the Xl, 0 dbposition.

Follow the steps below in sequence when calibratingthe 476J-1. Perform bench test and alignment pro­cedures at three month intervals and subsequent toshipment to correct misalignment caused by ship­ment or tube deterioration.

Figure 5-1. Selective and Wideband Voltmeter 476J-1,Calibration Equipment Assembly.

10 Revised: 15 October 1960

I

The instrument now provides equal gain in the VTVMor SEL VM positions.

5.3.3 50 KC OSCILLATOR LEVEL-CALIBRATION.When calibrated in the following manner the 50 kcoscillator can be used for an internal calibrationreference signal.

a. Turn switches INPUT, S102, the function se­lector, S105, and the SELECTIVE VOLTMETERRANGE, S104, to the CAL 2 position.

b. Adjust the dial for maximum meter deflectionat 50 kc.

c. Adjust CAL 1, R180, for a 0 db meterindication.

The 50 kc oscillator is now adjusted to the correctlevel.

5.3.4 OUTPUT AND METER ALIGNMENT

a. Switch the function selector S105 to theCAL 1 position.

b. Adjust rheostat R184 for a 0 db meterindication.

The last three stages of amplification, VI07 andVI08, and the meter are now properly calibratedto correspond to the 50 kc oscillator calibration.

5.3.5 NORMAL CALIBRATION. After completingthe steps of alignment in the preceeding paragraphs,and prior to using the 476J-l for test purposes,again perform the steps of calibration outlined inparagraph 3.3.

5.4 TROUBLESHOOTING

Under conditions of normal operation the 476J-l willnot require more than the routine maintenance

Revised: 15 October 1960

Section VMaintenance

specified in paragraph 5.3. The tube complementused has long life characteristics. Perform the stepsof bench test and alignment outlined in paragraph 5.3before attempting to troubleshoot the instrument. If

the instrument does not function properly, follow thegeneral outline below to help locate the malfunctioningpart or stage.

a. Remove the protective covers by looseningthe knurled thumb screws.

b. Test the tubes in a reliable tube tester.

c. Check the tube voltages. The indicatedvoltages should agree with those given in Table I .If, after a test of tubes and tube voltages, the unitdoes not function:

d. Attach an oscillator, tuned to 5 kc, to INPUTterminals EI0l and EI02. Adjust the input signallevel to + 20 db and the INPUT level switch S102 tothe + 20 db position.

e. Monitor the oscillator output signal by placingthe leads of an oscilloscope across INPUT terminalsEI0l and EI02; then adjusting the vertical input con­trols on the oscilloscope to show a low-amplitudesine-wave form.

f. Place a probe on one of the oscilloscopeleads and trace the signal t.~rough the circuit fromthe INPUT terminals to the output stage. Vary theoscillator output level at each check point to verifyproper operation. When the malfunctioning circuitis located:

g. Perform d-c voltage and resistance meas­urements to locate the circuit which is not func­tioning. Resistance voltage, and level values areshown in figure 5-2.

11/12

651334 Pb

Figure 6-1. Selective and Wideband Voltmeter 476J-l, Side View Cover Removed

Revised: 15 October 1960

Section VI

Parts List

15

Section VIParts List

CI29

MIOI

CI30

RISO

..... Rloa

5109

RI71

TlOIFLl03

TI05

VI04

VI07Vl09

VI03YI02

L112

RI56FIOI

YIOI-C132

CI53

05101

FLl04

CI52

L III ---_______

RI77

CI49

CI31

CI51

CI50

CI59

Figure 6-.2. Selective and Wideband Voltmeter 476J-l, Top View, Cover Removed 851 335 Ph

16 Revised: 15 October 1960

CI59 CI21 RI47 ATI04 CRI06 CRI08 RI88 RI86

Section VIParts List

CI63

DETAIL B

RI57

CRI14 -------"-

CRI15

RI63

RI65

RI36THROUGH

RI42 SI04 CI28 SI06 CI23 DETAIL D SI02

RI85

VIOl

RII9

FLiOI

CI15 CRI05 RI76 RI79 CRII2 RI83 RI81 RI87 RI33 CI14

RI35 RII6 CI56 RI78 CI55 RI84 RI82 CI13 RI34

651 337 Pc

Figure 6-3. Selective and Wideband Voltmeter 476J-1, Bottom View, Cover Removed, Part 1

Revised: 15 October 1960 17

Section VIParts List

RI45

CIIB

CI17 RI43 RI44 CI16

RI49

CI22

RI5B

RI91

RI92

RI64

RI66

CI62

RI23

RII7--_

CI07

RI24

CIOB

RI21

RI90 RI67 CI27 CRill CRIIO RI70

CI46

RI73

RI74

CI47

CI40--__

CI42

L2

RI2B

RI26

CRI04

CIII

ATI02

CII2

~~~----T102

""7;P,;r:----C 110

----- CI38

CI39

L5

CI36

CI41

L6

CI35 L4 CI37 L7 CI43 CI34

B51 336 Pc

Figure 6-4. Selective and Wideband Voltmeter 476J-l, Bottom View, Coyer Removed, Part 2

18 Revised: 15 October 1960

SECTION VIPARTS LIST

6.1 PART LIST

ITEM DESCRIPTION

ATlOl ATTEKl:ATOR PAD:

ATl02 ATTENUATOR PAD:

ATl03 ATTENUATOR PAD:

ATl04 ATTE~UATORPAD:

ATl05 ATTEKUATOR PAD:

Cl01 CAPACITOR, FIXED, PAPER:

0.2 fJ.f, fixed film, ±10% vdcw 300

Cl02 CAPACITOR, MOLDED, FIXED, CERAMIC:2000 fJ.fJ.f

Cl03 CAPACITOR, FIXED, FILM:. 1 fJ.f 350 vdcw

Cl04 CAPACITOR, FIXED, TUBULAR CERAMIC:. 001 fJ.f, 350 vdcw

Cl05 CAPACITOR, FIXED, DUAL ALl:MINUMELECTROLYTIC:

50-50 fJ.f, 350 vdcw

Cl06 CAPACITOR, FIXED, ALUMINUMELECTROLYTIC:

S fJ.f, 350 vdcw

Cl07 Same as Cl04

CIOS Same as Cl04

Cl09 Same as Cl06

ClIO CAPACITOR, FIXED, PAPER:.005 fJ.f, 150 vdcw

Clll CAPACITOR, VARIABLE, CERAMIC:10 fJ.fJ.f, 500 vdcw

C1l2 Same as Clll

TELETTRAPART NUMBER

V5A-3. APP97S0. CEI

2 -+ 5 db, 300 ohms

VSA-3 APP97S0, CE2,3 db, 150 ohms

VSA-3, Gr. 6653

CE2, 3 db, 150 ohms

VSA-3, APP9780, CE3,7 :.- 8 db 150 ohms

VSA-3, Gr. f:i653 CEL

2 .::- S db, 150 ohms

COLLINS

PART NUMBER

19

Section VI

Parts List

TELmRA COLLINSITEM DESCRIPTION

PART NUMBER PART NUMBERCll3 CAPACITOR, FIXED, FILM:

0.1 f.Lf, 350 vdcw, ±5%

C1l4 CAPACITOR, FIXED, FILM:.002 f.Lf, 150 vdcw

Cll5 CAPACITOR, FIXED, FILM:.01 f.Lf, ±10%, 1000 vdcw

CllG Same as C101

C1l7 CAPACITOR, FIXED. FILM:.001 f.Lf, 1000 vclcw, ±10%

Cll8 Same as C1l4

Cll9 CAPACITOR, FIXED, ALUMINUM,ELECTROLYTIC:

10 f.Lf, 25 vdcw

C120 CAPACITOR, FIXED, FILM:O. 5 f.Lf, 350 vclcw

C121 CAPACITOR, FIXED, ALUMINUMELECTROLYTIC:

50 -50 f.Lf, 400 vclcw

C122 CAPACITOR, FIXED, FILM:O. 2 uf, 350 vclcw

C123 CAPACITOR, FIXED, ALUMINUM,ELECTROLYTIC:

50 f.Lf, 12 vdcw

C124 Same as C123

C125 ~OT USED

C126 Same as Cll9

C127 Same as C106

C128 CAPACITOR, FIXED, FILM:.001 f.Lf, 1000 vclcw

C129 CAPACITOR, FIXED, FILM:

0.5f.Lf ,350vclcw

C130 Same as C129

20

Section VI

Parts List

TELmRA COLLINSITEM DESCRIPTIONPART NUMBER PART NUMBER

C131 CAPACITOR, VARIABLE, VERNIER-DRIVEN, MAIN TU~ING:

4-12 fJ-fJ-f: Telettra Gr. 4555/1

C132 CAPACITOR, TRIMMER, APC: Gr. 3120/14

C133 CAPACITOR, VARIABLE, CERAMlC:6-30 fJ-fJ-f

C134 CAPACITOR, CERAMIC, TEMP., COMP.:354 fJ-fJ-f

C135 Same as C133

C136 CAPACITOR, CERAMIC, TEMP. COMP.:320 flflf

C137 Same as C133

C138 CAPACITOR, TEMP., COMPo , CERAMIC: VSA-2, Gr. 6653/T.22275 fJ-fJ-f

C139 Same as C133

C140 CAPACITOR, TEMP., COMP., CERAMIC: VSA-2, G4. 6653/T. 22224.5 lJ.fJ-f

C141 Same as C133

C142 CAPACITOR, TEMP., COMP., CERAMIC: VSA-2, Gr. 6653/T.22354 fJ-fJ-f

C143 Same as C133

C144 CAPACITOR, TEMP., COMP., CERAMIC: VSA-2, Gr. 6653/T.22261. 5 flflf (2)

C145 CAPACITOR, PRECISION CERAMIC:6000 fJ-f.1f, ±1. 2%, 25.0 vdcw

C146 Same as C145

C147 CAPACITOR, TEMP., COMP., CERAMIC: VSA-2, Gr. 6653/T. 22248. 5 }-L}-Lf (2)

C148 CAPACITOR, FIXED:0.2 }-Lf, 350 vdcw, ±10%

C149 CAPACITOR, FIXED, CERAMIC:O. 2 f-Lf, 400 vdcw

21

Section VI

Parts List

rrEM

Cl50 NOT USED

Cl51 NOT USED

C152 ",OT USED

Cl53 NOT USED

DESCRIP'nONTELmRA

PART NUMBERCOLLINS

PART NUMBER

C154 CAPACITOR, FIXED, FILM:

.0032 f.l.f, 350 vdcw

C155 CAPACITOR, FIXED, CERAMIC, TUBULAR:

56 f.lf-if, 500 vclcw

C15G CAPACITOR, FIXED, FILM:. 005. f-if, 1000 vclcw

C157 CAPACITOR, FL'CED, TEMP., COMP.,

CERAMIC:

24.8 f.lf-if

C158 CAPACITOR, FIXED, CERAMIC:.01 f-if, 1000 vdcw

C159 CAPACITOR, ALUMINUM, ELECTROLYTIC:50 f-if, 400 vdcw

C1GO CAPACITOR, FlXED, ALUMINUM,ELECTROLYTIC:

50 f-if, 25 vdcw

C161 CAPACITOR, FIXED, FILM:

.02 f-if, 1000 vdcw

C162 Same as C113

C163 CAPACITOR, FIXED, TEMP., COMP.,CERAMIC:

122.5 f.lf-if

C1G4 CAPACITOR, FIXED, TEMP., COMP.,CERAMIC:

817 f.lf-if

C165 Same as C113

C1G6 CAPACITOR, FIXED, TEMP., COMP.,CERAMIC:

242 f-ilJ.f

Cl67 CAPACITOR, FIXED, TEMP., COMP.,CERAMIC:

12570 f-if.l.f

22

Section VIParts List

I I I

_.. _..._..,

TELmRA COLLINSITEM DESCRIPTION PART NUMBER PART NUMBER

~~-""'..-

C168 CAPACITOR, FIXED, TEMP., COMP.,CERAMIC:

1225 uf.lf

C169 CAPACITOR, VARIABLE, CERAMIC: VSA-3, 83081/10EPhillips

C170 Same as C169

C171 CAPACITOR, FIXED, FILM:10 fll.Lf

C172 CAPACITOR, FIXED, ELECTROLYTIC,50 flf, 12 vdcw

C173 CAPACITOR, FIXED, FILM:

3.3 f.lf.lf

C174 CAPACITOR, FIXED, FILM:O. 11.Lf, 1000 vdcw

C175 CAPACITOR, FIXED, FILM:

3.3 flf.lf

C176 CA PACITOR, FIXED, MOLDED, CERAMIC:1000 - 5000 uf.lf (value optional)

C177 CAPACITOR, FIXED, MOLDED, CERAMIC:1000 f.l,.Lf, 150 vdcw

CR101-CR104 CRYSTAL DIODES: VSA-3, P. 13155

CR105 CRYSTAL DIODE: VSA-3, P. 7821

CR106-CR109 CRYSTAL DIODES: Same as CR101-CR104

CRllO-

CRIll CRYSTAL DIODES: Same as CR105

CR1l2-

CR1l5 SELENIUM RECTIFIERS: VSA-3, P. 11400/10

CR1l6 CRYSTAL DIODE: Same as CR105

CR1l7 -CR120 Same as CR112-CR115

DS101 LAMP, MINIATURE, BAYONET:No.7. 6.3 vac 262 3240 00

23

Section VI

Parts List

TELmRA COLLINSITEM DESCRIPTION PART NUMBER PART NUMBER

-DS102 Same as DS101

F101 FUSE, .375 A, 250 v 264 4021 00

Fl02 FUSE, 2A, 250 V 2644070 00

FLlG1 FILTER, LOW PASS:750 kc VSA-3 Gr. 9861

FL102 FILTER, BAND PASS:

800 kc VSA-3, Gr. 9857

FL103 FILTER, BAND PASS:

800 kc VSA-3, Gr. 9858

FLl04 FILTER, BAND PASS:

15 kc FSA-3, Gr. 9859

FLl05 FILTER, BAND PASS:15 kc VSA-3, Gr. 9860

J101 PHONE JACKS: VSA-3 Gr. 986

L101 INDUCTOR, RADIO FREQUENCY: VSA-3, Gr. 9961,B.27613, L1

L102 INDUCTOR, RADIO FREQUENCY: VSA-3, Gr. 6653,

B. 33961, L1

L103 INDUCTOR, RADIO FREQUENCY: VSA-3, Gr. 6653

B. 33962, L2

L104 INDUCTOR, RADIO FREQUENCY: VSA-3, Gr. 6653,

B. 33963, L3

L105 INDUCTOR, RADIO FREQUENCY: VSA-3, Gr. 6653,

B. 33964, L4

L106 INDUCTOR, RADIO FREQUENCY: VSA-3, Gr. 6653,

B. 33965, L5

L107 INDUCTOR, RADIO FREQUENCY: VSA-3, Gr. 6653

B. 33966, L6

Ll08 INDUCTOR, RADIO FREQUENCY: VSA-3, Gr. 6653,

B. 33561, L7

Ll09 INDUCTOR, RADIO FREQUENCY: VSA-3, Gr. 9852

B. 37154, L1

L110 INDUCTOR, RADIO FREQUENCY: VSA-3, Gr. 9851

B. 33961, L1

24

Section VIParts List

TELmRA COLLINSITEM DESCRIPTION PART NUMBER PART NUMBERLllI INDUCTOR, RADIO FREQUENCY: VSA-3, Gr. 2372

P. 33962, L2

LlI2 INDUCTOR, RADIO FREQUENCY: VSA-3, APP. 9780

1. 402.02 11

P101 PLUG, MALE, 2-Connector, a-c:

RlOl RESISTOR, FIXED, FILM:619 ohms ±O. 5%, 1 w

R102 RESISTOR, FIXED, FILM:

152 ohms, iO. 5%, 1 w

R103 RESISTOR, FIXED, FILM:

75 ohms, ±O. 5%, 1 w

R104 RESISTOR, FIXED, FILM:898 ohms; ±0.5%, 1 w

R105 RESISTOR, FIXED, FILM:162.5 ohms, ±0.5%, 1 w

R106 RESISTOR, FIXED, FILM:78.7 ohms, iO.5%, 1w

R107 RESISTOR, FIXED, FILM:124 ohms, ±O. 5%, 1 w

R108 RESISTOR, FIXED, FILM:2740 ohms, ±2%, 1/2 w

R109 RESISTOR, VARIABLE, WIRE-WOUND,NON-INDUCTIVE:

5,000 ohms, ±10%, 2 w

RllO RESISTOR, FIXED, FILM:

20,000 ohms, ±0.5%, 1/2 w

Rlll RESISTOR, FIXED, FILM:

6340 ohms, ±0.5%, 1/2 w

Rll2 RESISTOR, FIXED; FILM:2000 ohms, ±O. 5%, 1/2 w

Rll3 RESISTOR, FIXED, FILM:

634 ohms, ±0.5%, 1/2 w

Rll4 RESISTOR, FIXED, FILM:

200 ohms, ±0.5%, 1/2 w

25

Section VIParts List

TELmRA COLLINSITEM DESCRIPTION

PART NUMBER PART NUMBER

R1l5 RESISTOR, FIXED, FILM:63.4 ohms, ±0.5%, 1/2 w

R1l6 RESISTOR, FIXED, WIRE WOUND:

4000 ohms, +5%, 10 w

R1l7 RESISTOR, FIXED, FILM:4750 ohms, ±2%, 1 w

R1l8 RESISTOR, FIXED, FILM:1000 ohms, ":2%, 1 w

R1l9 RESISTOR, FIXED, FILM:100 ohms, ±2%, 1/4 w

R120 RESISTOR, FIXED, FILM:

121 ohms, ":0.5%, 1/2 w

R121 RESISTOR, FIXED, FILM:

100,000 ohms, ±2%, 1/2 w

R122 Same as R120

R123 Same as R120

R124 RESISTOR, FIXED, FILM:133 ohms, ±2%, 1/2 w

R125 RESISTOR, FIXED, FILM:

10 ohms, ±2%, 1/2 W

R126 RESISTOR, VARIABLE, COMPOSITION:10,000 ohms

R127 Same as R126

R128 RESISTOR, FIXED, FILM:715 ohms, ±0.5%, 1/2 w

Rl29 Same as R128

Rl30 Same as R1l8

R131 RESISTOR, FIXED, FILM:16,200 ohms, ":2%, 1/2 w

R132 RESISTOR, FIXED, FILM:162 ohms, ±2%, 1/2 w

R133 RESISTOR, FIXED, FILM:

15,800 ohms, :':2%, 1 w

26

Section VIParts List

TELETTRA COLLINSITEM DESCRIP1'ION

PART NUMBER PART NUMBERR134 RESISTOR, FIXED, FILM:

51,100 ohms, ±2%, 1 w

R135 RESISTOR, FIXED, FILM:10,000 ohms ±2%, 1 w

R136 RESISTOR, FIXED, FILM:

13,700 ohms, =0.5%, 1/2 w

R137 RESISTOR, FIXED, FILM:

4320 ohms, ±0.5%, 1/2 w

Rl38 RESISTOR, FIXED, FILM:1370 ohms, ±0.5%, 1/2 w

R139 RESISTOR, FIXED, FILM:432 ohms, ±0.5%, 1/2 w

Rl40 RESISTOR, FIXED, FILM:

137 ohms, ±0.5%, 1/2w

R141 RESISTOR, FIXED, FILM:

43.2 ohms, ±0.5%, 1/2w

R142 RESISTOR, FIXED, FILM:

20 ohms, ±O. 5%, 1/2 w

R143 RESISTOR, FIXED, FILM:

110,000 ohms, ±2%, 1 w

R144 RESISTOR, FIXED, FILM:787,000 ohms, ±2%, 1 w

R 145 RESISTOR, FIXED, FILM:

100,000 ohms, ±2%, 1 w

R146 RESISTOR, FIXED, FILM:

2740 ohms, :+:0.5%, 1/2 w

R147 RESISTOR, FIXED, FILM:1, ODD, 000 ohms, ±2%, 1/4 w

R148 RESISTOR, FIXED, FILM:825 ohms, =2%, 1/2 w

R149 RESISTOR, FIXED, FILM:

100 ohms, ±0.5%, 1/2w

R150 Same as R149

R151 RESISTOR, FIXED, FILM:

23,700 ohms, ±0.5%, 1/2 w

27

Section VI

Parts List

ITEM

R152

DESCRIPTION

RESISTOR, FIXED, FILM:

68,100 ohms, ±O. 5%, 1/2 w

TELmRA

PART NUMBER !COLLINS

PART NUMBER

R153 RESISTOR, FIXED, FILM:

249 ohms, =0.5%, 1/2 w

R15-l RESISTOR, FIXED, FILM

1000 ohms, ±0.5%, 1/2 w

R155 Same as R147

R156 RESISTOR, VARIABLE, COMPOSITION:

300 ohms, ±20%, 2 w

R157 RESISTOR, FIXED, FILM:10,000 ohms, ±2%, 1/4 w

Rl.58 RESISTOR, FIXED, FILM:6810 ohms, ~2%, 1 w

R159 RESISTOR, FIXED, FILM:

5110 ohms, =2%, 2 w

R160 RESISTOR, FIXED, FILM:

8250 ohms, =2%, 1 w

R161 RESISTOR, FIXED, FILM:

10,000 ohms, ±2%, 1 w

R162 RESISTOR, FIXED, FILM:

133 ohms, =0.5%, 1/2 w

R163 RESISTOR, FIXED, FILM:

511,000 ohms, ±2%, 1/4 w

R164 RESISTOR, FIXED, FILM:

162 ohms, ±2%, 1/2 w

R165 Same as R163

R166 RESISTOR, FIXED, FILM:

40.2 ohms, =2%, 2 w

R167 RESISTOR, FIXED, FILM:70.65 ohms, +0.5%, 1/2w

R168 Same as R161

R169 RESISTOR, FIXED, FILM:

42,200 ohms, ±2%, 1 w

28

Section VI

Parts List

I ITELmRA I COLLINS

ITEM DESCRIPTIONPART NUMBER I PART NUMBER

---Rl70 RESISTOR, FIXED, FILM: ,

200, 000 ohms, +2%, 1/4 w

R171 RESISTOR, FIXED, FILM:1.50 ohms, -:0.5%, 1/2 w

R172 RESISTOR, FIXED, FILM:

17,800 ohms, ±2%, 1w

Rl73 RESISTOR, FIXED, FILM:1000 ohms, ":2%, 1/2w

Rl74 RESISTOR, FIXED, FILM:

100, 000 ohms, +2%, 1/2 w

R175 NOT USED

R176 NOT USED

R177 NOT USED

R178 RESISTOR, FIXED, FILM:

-18,700 ohms, ±2%, 1/2 w

R179 RESISTOR, FIXED, FILM:10, 000 ohms, 4:2%, 1/2 w

R180 RESISTOR, VARIABLE, COMPOSITION:300 ohms, ±20%, 2 w

R181 RESISTOR, FIXED, FILM:

16, 000 ohms, -to.5%, 1/2 w

R182 Same as R181

R183 RESISTOR, FIXED, FILM:

80.6 ohms, ±0.5%, 5 w

R184 RESISTOR, VARIABLE, TAPPED, WW:

350 ohms, 10 w

R185 RESISTOR, FIXED, FILM:

511 ohms, to.5%, 1/2 w

R186 RESISTOR, FIXED, FILM:100, 000 ohms, "-2%, 1/2 w

R187 RESISTOR, FIXED, FILM:4420 ohms, ±2%, 1w

R188 RESISTOR, FIXED, FILM:

40,200 ohms, ±2%, 1w

29

Section VIParts List

COLLINSPART NUMBER

r----'I--------------------,---~-------:T=EL:-:m=::;;;R-A

ITEM DESCRIPTION PART NUMBER1-----4'---------------------1-------------1------------i

11.189 RESISTOR, FIXED, 'NW CERAMIC:

5,000 ohms, 10 w

11.190 RESISTOR, TAPPED, VARIABLE, WIRE

WOUND:1000 ohms, 10 w

11.191 RESISTOR, FIXED, FILM:

1000 ohms, =0.5%, 1/2 w

R192 RESISTOR, FIXED, FILM:

2490 ohms, ±O. 5%, 1/2 w

11.193 RESISTOR, FIXED, FILM:

100 ohms, ±2%, 1/4 w

11.194 Same as 11.193

R195 RESISTOR, FIXED, FILM:1000 Ohms, ±2%, 1 w

11.196 RESISTOR, FIXED, FILM:

6810 ohms, =2%, 1 w

11.197 Same as 11.195

11.198 RESISTOR, FIXED, FILM:

40,200 ohms, =0.5%, 1 w

11.199 RESISTOR, FIXED, FILM:

4420 ohms, =2%, 1 w

11.200 Same as 11.185

11.201 RESISTOR, FIXED, FILM:162,000 ohms, ±0.5%, 1/2 w

11.202 Same as 11.191

11.203 RESISTOR, FIXED, FILM:378.5, ±0.5%1/2w

11.204 RESISTOR, FIXED, FILM:13,700 ohms, ±0.5%, 1/2w

11.205 RESISTOR, FIXED FILM:18,000 ohms, +0.5%, 1/2 w

11.206 HESISTOR, FIXED FILM:

19,350 ohms, ±o. 5%, 1/2 w

11.207 RESISTOR, FIXED FILM:19,800 ohms, =0.5%, 1/2 w

30

Section VIParts List

TELmRA COLLINSITEM DESCRIPTION

PART NUMBER PART NUMBERR208 RESISTOR, FIXED, FILM:

20,000 ohms, ±O. 5%, 1/2 w

R209 Same as R208

R210 Same as R207

R211 RESISTOR, FIXED FILM:

9.09 ohms, ±0.5%, 1/2 w

R212 RESISTOR, FIXED FILM:

4.32 ohms, ±0.5%, 1/2 w

R213 RESISTOR, FIXED FILM:

49.9 ohms, ±0.5%, 1/2 w

R214 RESISTOR, FIXED FILM:402 ohms, ±O. 5%, 1/2 w

R215 Same as R214

R216 RESISTOR, FIXED FILM:500 - 3000 ohms (value optional) 1 w

S101 SWITCH, ROTARY, WAFER:Double-pole, 9-position, 3-wafer,single terminal shorting

S102 SWITCH, ROTARY, WAFER:

Single-pole, 10-position, single wafer,single terminal shorting

S103 SWITCH, ROTARY, WAFER:

Double-pole, 6-position, single wafer,single terminal shorting

S104 SWITCH, ROTARY, WAFER:Single-pole, 8-position, single wafer,single terminal shorting

S105 SWITCH, ROTARY, WAFER:

3-pole, 6-position, double wafer,single terminal shorting

S106 SWITCH:Spst toggle

S107 SWITCH:Spdt toggle

T101 TRANSFORMER, RADIO FREQUENCY: VSA-3, Gr. 9865T. 412.120

31

Section VIParts List

TELET'rRA COLLINSITEM DESCRIP1'ION PART NUMBER PART NUMBER

Tl02 TRANSFORMER, RADIO FREQUENCY: VSA-3, Gr. 6653,

T. 399.51

1'103 TRANSFORMER, RADIO FREQUENCY: VSA-3, Gr. 6653,

1', 413.155

1'104 TRANSFORMER, RADIO FREQUENCY: VSA-3, Gr. 6653,

T. 398.56

Tl05 TRANSFORMER, RADIO FREQUENCY VSA-3, Gr. 2374T. 400.164

VIOl TUBE, MINIATURE, 9-PIN: 255 0332 00

ECC88/6922

VI02 TUBE, MINIATURE, 9-PIN: 255 0355 00

E83F/6689

V103 Same as V102

VI04 Same as V102

VI05 TUBE, MINIATURE, 9-PIN: 255 0354 00 .E80F/6084

V106 Same as V102

V107 TUBE, MINIATURE, 9-PIN: 255 0218 00ECC81/6201

V108 Same as V107

V109 Same as V102

VllO TUBE, GLOW-DISCHARGE DIODE 257 0052 00

VOLTAGE REGULATOR, OA2, 7-PINMINIATURE

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APPLICATION

AUTHENTICATION TITLE

DItAWN J HARDIN SELECTIVE AND "iByCHECK[DBY VOLTMETEA""ItOVEDBY

"It OJ£ CT C. CRANOR476 J - I

£""NEEItDATE

FEB, 1,1959DItAWII

FIGURE 5- 2I

SI05A

6

5

4

+_~t---I------1 V )------.

~ 101

CRill

564 0520 006C 129

_0'r [3-,J'~.~O

IPHOMESI

ISSUE

- '1ADD VOLTAGE MEASUREMENTS,2 NOTES I 8 2. SWITCH POSITIONS. LEK 6-2-60 T-136BO

RI56 WAS 300.1\.. iI R215 WAS R204

LEK 9-21-59 T-1I0B5 IR216 WAS R203

IlEXT AISY I Q'TY I U lED ON NO DESCall'TION AUT" DATE "EVIIIO"1110

APPLICATION REVISIONS

rHENTICATION TITLE COLLINS RADIO COIPMYJ HARDIN SELECTIVE AND WIDEBAND DALLAS, TEXAS

PART NOVOLTMETER

l 564 0520 006

C. CRANOR476 J-I, SHEET OF SHEETS

FEB 1,1959 CUSTOMER NO.

,LIRE ~- 2I 13

HOOK-UP WIRE CODEThe characteristics of the hook-up wire used in this equipment are indicated by groups of symbols on the

diagrams. Each symbol group consists of a maximum of three letters followed by a maximum of threenumerals. When three letters are used the first indicates the type of wire, the second represents the sizeof wire, and the third is the letter' 'S", used only when the wire is shielded. When two letters are used, thefirst and second letters indicate either the type and size of wire or the size of wire and shielding, respectively.When one letter is used it indicates the wire size only. The first numeral indicates the color of the wire bodyand the second and third numeral s, if any, represent the colors of tracers, all numerals being in accordancewith the standard EIA and MIL-W-16878 color code.

The symbols are assigned according to the following table.

TYPE OF WIRE CODE

LETTER TYPE OF WIRE

A Cotton Braid Over Plastic(Formerly AN-J-C-48)

B Busbar, Round TinnedC MIL-W-16878 Type B (#20 and Larger)

(600 Volts)D Miniature Wire, MIL-W-16878 Type B

(#22 and Smaller)EF Extra Flexible Varnished CambricGH Kel- F (Monochlorotrifluoroethylene)JK Neon Sign Cable (15,000 Volts)L SiliconeMN Single Conductor Stranded (Not Rubber

Covered)P Single Conductor Stranded (Rubber

Covered)

QR MIL-W-16878 Type C (1000 Volts)T Teflon, MIL-W-16878 Type E

(600 Volts)V MIL-W-16878 Type D (3000 V-olts)W Teflon, MIL-W-16878 Type EE

(l000 Volts)XYZ Acetate Yarn, Telephone Type

SIZE OF WIRE CODE

LETTER SIZE

A #22 AWGB #20C #18D #16E #14F #12G #10H #8J #6K #4L #2M #1N #0P #00Q #000R #0000T #28V f126W #24X ::19Y .. 30Z

COLOR CODE

NUMBERCOLOR

OR LETTER

a Black1 Brown2 Red3 Orange4 Yellow5 Green6 Blue7 Violet8 Gray (Slate)9 Whitea Clearb Tanc Pinkd Maroone Light Greenf Light Blue

EXAMPLES

MIL TYPER

Type of Wire

C, #22AWG, UNSHIELDED WIRE, WHITE WITH RED AND GREEN TH,ACERS:A 9 25 4-1/4

Size of Wire Color of Body Color of Tracers -- Lenl:,rth of Wi!'e in Inches(Includes Stripping & Tinning)

MIL TYPE C, :;16A\\"G, SHIELDED \VIRE (SINGLE),R D S 9

Type of Wire Size of \\"ire Shielded Color of Body

WHITE WITH RED AND GREEN TRACERS:25 4-1/4

Color of Tracers -- Lenhrth of Wire in Inches(Includes Stripping & Tinning)

MIL TYPE B, "22A\\'G, SHU LDED SIRE (~lLLTIPLE), WHITE, AND WHITE WITH RED TRACER:D ..... ~ 19 1 (92) 4-1/4

Type of \\'lre .:)~ze oJ! ,\',re ::::-":\:"~:::l,j Lr:::t Cmduetor Second Conductor -- Lenhrth of Wire in Inches(Inc ludes Stripping & Tinning)

-- COLLINS RADIO COMPANY -----