B&K E-200D User manual

MANUAL Model E-200D

RF Signal Generator

AProduct of DYNASCAN CORPORATION 1801 West Belle Ptaine Chicago, Illinois 60613

PRICE $2.00

Dear Friend:

Congratulations on your purchase of B<S K—Precision Test Equipment, and

welcome to the B& K family. We hope your experience with your new test equip-

ment will make you alifetime B&Kcustomer.

Your instrument is backed by more than 20 years of experience in designing

and manufacturing. Our most important goal is your satisfaction. At B&K, test

equipment is made to meet the demands of the field, focusing on dependability and

acciuacy. We also concentrate on simplicity and operating ease with features that

reduce the possibility of human error and speed the servicing process.

In order to determine the type of test rmits that ore needed we have been guided by letters and reports

from technicians and engineers who use the equipnnent daily. Orir field tests and studies have helped provide

better and faster service techniques. Close contact has been maintained with the manufacturers of consumer

products which our test units will be checking and trouble-shooting.

Key personnel in our company cut th^ eye teeth in the TV service business. This is why we have more

"sensitivity" for the problems and conditions under which the test equipment will be used.

B<& Kproduct designs are constantly reviewed, and refinements ore made or new models developed to

meet advances in our industry and to fill your needs. We set our standards high so you can be assured that

the B<S Ktest instruments you buy represent advanced design, quality construction, and dependable long-

term performance at aprice you can afford.

If you have any comments or thoughts about our products, or test equipment in general, Iwould be

delighted to hear from you.

Thanks for your confidence in B&Kand we look forward to serving you for along time to come.

Sincerely,

O^/c'^—

Carl Kom

President

INSTRUCTION MANUAL

FOR

B&k/precision

MODEL E-200D

RFSIGNAL GENERATOR

B&KDIVISION OF DYNASCAN CORPORATION

1801 W. Belle Plaine Avenue

Chicago, Illinois 60613

B&K/PRECISION MODEL E-200D

RFSIGNAL GENERATOR

TABLE OF CONTENTS

Page

SPECIFICATIONS 4

FEATURES 5

OPERATOR'S CONTROLS AND INDICATORS 7

OPERATING INSTRUCTIONS 8

Preliminary Set-up 8

Setting the Signal Level 8

Setting Modulation 8

ALIGNING AM BROADCAST BAND RECEIVERS 11

ALIGNING FM BROADCAST BAND RECEIVERS 12

ALIGNING TELEVISION RECEIVERS 14

Sound IF 14

Video IF 14

Tuner Adjustment 14

USING THE RF SIGNAL GENERATOR TO LOCATE TROUBLES 15

OTHER USES FOR THE RF SIGNAL GENERATOR 16

Alignment 16

Measuring Gain 16

Measuring Bandwidth 16

CIRCUIT DESCRIPTION 18

CALIBRATION OF 100 KHz OSCILLATOR 18

WARRANTY SERVICE INSTRUCTIONS 20

SPECIFICATIONS

FREQUENCY

RANGE

100 kHz to 54 MHz in five funda-

mental bands.

32 MHz to 216 MHz in two har-

monic bands.

BAND A100 kHz to 370 kHz

BAND B370 kHz to 1400 kHz

BAND C1.4 MHz to 5.1 MHz

BANDD 5.1 MHz to 16 MHz

BANDE 16 MHz to 54 MHz

BAND Hj 32 MHz to 108 MHz

(harmonic)

BAND H4 64 MHz to 216 MHz

(harmonic)

FREQUENCY

ACCURACY ±1.5% of highest frequency on

any given band, usable to ±-

0.1% with crystal calibrator.

Output open circuited, meter un-

calibrated:

BAND A3Vrms minimum

BAND B2Vrms minimum

MAXIMUM BAND C0.6 Vrms minimum

OUTPUT LEVEL BANDD 0.3 Vrms minimum

BANDE 0.3 Vrms minimum

BANDH2 uncalibrated har-

monic output

BANDH4 uncalibrated har-

monic output

—106 dB (0.5 microvolt) to +2dB

(126,000) microvolts) into 50-ohm

CALIBRATED load. Carrier meter covers —10

OUTPUT to +2dB range (reference 0dB =

100,000 microvolts into 50-ohm

load); attenuators extend range to

—106 dB.

CALIBRATED

OUTPUT ±1 dB 100 kHz to 54 MHz

ACCURACY

ATTENUATORS Six step attenuators of 20 dB, 20

dB, 20 dB, 20 dB, 10 dB and 6dB

(96 dB total) plus fully adjustable

fine attenuator control.

MODULATION

TYPE CW or amplitude modulation

INTERNAL

MODULATION 400 Hz ±20% from bridged "T"

two-stage oscillator; adjustable

level.

EXTERNAL

MODULATION

SENSITIVITY

Approximately 1Vrms for 50%

modulation at 400 Hz.

MODULATION

METER

Reads 0to 50% modulation for

internal or external modulation:

accuracy ±5% from 100 kHz to

30 MHz.

CRYSTAL

CALIBRATOR

Crystal calibration points every 1

MHz and 100 KHz (derived). Ac-

curacy 0.05%. Built-in detector,

amplifier and speaker for "zero

beating".

400 Hz

OUTPUT

Output of internal modulation os-

cillator available for external use

at EXT MOD jacks.

Level: 1.25 volts maximum

Impedance: 5K ohms at maximum

level.

Distortion: Less than 0.5%

POWER

REQUIREMENTS 117 VAC, 50/60 Hz, 6 watts

SIZE 12 %" wide X7%" high x8" deep

SHIPPING

WEIGHT Approximately 14 pounds

FEATURES

WIDEST

FREQUENCY

RANGE

Continuous coverage from 100 kHz

to 216 MHz in seven frequency

bands (54 MHz to 216 MHz signals

use harmonic output). No gaps in

coverage. Covers AM broadcast

band, FM broadcast band, am-

ateur, short wave and two-way

communications bands, and all

VHF television channels, plus all

i-f frequencies.

FULLY

SOLID

STATE

Uses 18 semiconductor devices for

all the advantages of solid state

technology; reliability, rugged-

ness, instant warm-up, low power

consumption, no high voltage,

light weight and compactness.

FULLY

SHIELDED

Oscillators and attenuators are

shielded to reduce "spray" radi-

ation; aneccessity when testing

and aligning high sensitivity

receivers.

SINUSOIDAL

OUTPUT Sinusoidal rf output signal has

very low distortion on funda-

mental output ranges to 54 MHz.

VERNIER

SCALE

TUNING

A6.1 gear reduction ratio be-

tween the tuning knob and the

dial allows the dial to be easily

and accurately set.

EASY-TO-READ

DIAL

Alarge circular two-color dial (15-

inch circumference with seven

separate frequency scales pro-

vides easy, accurate direct fre-

quency readings.

Key frequencies and frequency

ranges ore identified: Broadcast

receiver i-f; FM i-f; TV i-f sound

and video frequencies; FM band;

VHF TV Video Carrier frequencies

for all 12 VHF channels.

CALIBRATED

OUTPUT

LEVEL

Acarrier level meter and step

attenuators provide accurately

calibrated output level measure-

ment from —106 dB to +2 dB (0.5

uV to 126,000 uV) when using the

50-ohm terminated cable that is

supplied with the instrument.

ADJUSTABLE

MODULATION

Amodulation percentage meter

and modulation level adjustment

permit calibrated modulation from

0to 50%, with higher uncalibrated

levels (up to 100%) possible.

FREQUENCY

ACCURACY

Abuilt-in crystal controlled oscil-

lator, "zero beat" circuit and ad-

justable cursor marker provide

dial accuracy of 0.1%.

INTERNAL

MODULATION Internal 400 Hz oscillator pro-

vides low distortion modulation

voltage.

400 Hz

OUTPUT

The output of the 400-Hz oscilla-

tor is available at the external

modulation jacks for use as an

audio test signal. Thus, the sig-

nal generator can be used for

complete testing of both the rf

and audio sections of areceiver.

The level is fully adjustable from

0to 1.25 volts rms.

PILOT

LAMP

EASE OF

OPERATION

Lets you tell at aglance whether

instrument is on or off.

Controls and indicators are "op-

erator designed". Related con-

trols are grouped, lettering is

easy to read and "explains"

rather than confuses. Simplified

control layout for calibration ac-

curacy eliminates complicated

conversion tables and graphs for

precision frequency and output

level settings.

ATUMUAIO*

ATTIMUUkTOt

utnn

CAL1B«AT0M

VWO«Hi

I^IQPOLATION^

100 H;

Figure 1. Operator's Controls and Indicators

OPERATOR’S CONTROLS AND INDICATORS

(Refer to Figure 1)

Pilot lamp—Lights continuously when signal

generator is turned on.

METER switch

%MOD position—Connects meter to meas-

ure percentage of modulation.

CARRIER position—Connects meter to meas-

ure carrier (rf output signal) level.

Meter—Indicates carrier level in dB on top (red)

scale or percentage of modulation on bot-

tom (black) scale. Use the scale which

corresponds to the METER switch position.

NOTE

The rf output must be terminated in a

50-ohm lead when using the carrier scale

for calibrated output level.

MOD LEVEL control—Adjusts percentage of

modulation for internal or external modu-

lation. Adjusts level of 400-Hz tone output

when MODULATION switch is in 400 Hz

OUT position.

Dial—Indicates the frequency of the output sig-

nal. Use the scale which corresponds to

the RANGE switch position.

Frequency control—Adjusts the dial frequency.

Cursor marker adjustment—Adjusts the cursor

marker for highly accurate frequency read-

ings when used with the crystal calibrator.

8. RANGE switch—Selects the frequency range

for the output signal as follows;

Range A—100 kHz to 370 kHz

Range B—370 kHz to 1400 kHz

Range C—1.4 MHz to 5.1 MHz

Range D—5.1 MHz to 16 MHz

Range E—15 MHz to 54 MHz

Range Hj—30 MHz to 108 MHz

Range H|—60 MHz to 216 MHz

9. FINE ATTENUATOR control—Fine setting of

output level.

10.

ATTENUATOR selectors—Coarse setting of out-

put level. Six individual attenuators of 20,

20, 20, 20, 10 and 6dB permit steps from 0

to 96 dB. Each switch has two positions as

follows:

IN position—adds attenuation

OUT position—removes attenuation

11.

RF OUT jack —Connector for output signal.

Mates with microphone type connector.

12.

RF output cable—Connects output signal to

equipment being tested or aligned. Cable

contains 50-ohm termination. Use an un-

terminated coble if the output is being fed

directly to a50-ohm circuit.

13.

XTAL CALIBRATOR switch

1MHz position—Provides crystal calibration

at each multiple of IMHz.

OFF position —disables calibration oscilla-

tors.

100 KHz position—Provides crystal calibra-

tion points at each multiple of 100 kHz.

14.

Speaker (behind dial)—Provides audible "zero

beat" for crystal calibration procedure.

15.

MODULATION switch

AC OFF position—turns off unit. Unit is on in

all other positions.

CW position —Provides unmodulated CW

(continuous wave) output.

INT position —Provides 400 Hz internally

modulated output.

EXT position—Provides externally modulated

output. The external modulation voltage is

connected to EXT MOD jacks when using

this switch position.

400 Hz OUT position—Provides 400-Hz output

at the EXT MOD jacks.

16.

MOD jacks—Input jacks for external modula-

tion and output jacks for 400-Hz tone. Uni-

versal binding post type jacks accept ba-

nana plug, meter leads, spade lugs, etc.

Black post is grounded, red post is audio

high.

OPERATING INSTRUCTIONS

PRELIMINARY SET-UP

1. Connect the plug of the ac power cord to a117-

volt, 50/60 Hz ac power outlet.

2. To turn on the signal generator, set the MOD-

ULATION switch 15 to the CW position. The pilot

lamp 1should light.

3. Set the XTAL CALIBRATOR switch 13 to the OFF

position.

4. Set the RANGE switch 8to the desired frequen-

cy range.

5. Set the dial 5to the desired frequency with the

frequency control knob 6

6. Connect the rf output cable to the RF OUT

jack 11. The cable supplied with the signal gen-

erator is normally used. It contains abuilt-in

50-ohm termination. However, if the rf output

signal is to be applied directly to a50-ohm cir-

cuit, an unterminated rf cable should be used.

Such acable can be made from alength of 50-

ohm coaxial cable (RG-58A/U) terminated in a

microphone type female connector on one end

and the desired connector or terminations on

the other end.

7. Connect the rf output cable to the equipment

being tested. Connect the black lead to the

chassis first, then the red lead to the signal

injection point.

PRECAUTIONS

A. When performing stage-to-stage measure-

ments, always use adc blocking capacitor

between the red probe of the rf output cable

and the circuit into which the signal is in-

jected. This protects the attenuators of the

signal generator from possible damage by

the dc from the circuit under test. Trim the

capacitor leads as short as possible, while

still permitting adequate length for connec-

tions. The value of the blocking capacitor is

dependent upon the frequency of the rf out-

put signal. Suggested values are:

Ranges Aand B: .1 uF, 400 V

Ranges Cand D: .01 uF to .02 uF 400 V

Ranges E, H.>, Hi: 1000 pF

B. If the equipment into which the rf signal is

being injected uses an ac powered, trans-

formerless power supply, always use an iso-

lation transformer between the 117-volt out-

let and the equipment to prevent electrical

shock and possible damage to the equip-

ment. The equipment chassis becomes

grounded through the rf signal generator

when the rf cable is connected.

C. When connecting the rf output cable to

equipment under test, always cormect the

black lead to the equipment chassis first.

Otherwise, atransient voltage spike may oc-

cur when the connection is made that may

damage transistorized equipment.

D. Use a dc blocking capacitor in series with

the black lead of rf or 400-Hz output cables

if other than chassis reference is used in

equipment which has its chassis at earth

ground. The black terminal of the EXT MOD

jacks and the black probe of the rf cable ore

at eaith ground potential through the 3-wire

power plug. Serious damage to equipment

could result by using adirect connection.

SETTING THE SIGNAL LEVEL

1. Be sure the output is terminated in a50-ohm

load.

2. Set the MODULATION switch 15 to the CW po-

sition.

3. Set the METER switch 2to the CARRIER position.

4. Determine the amount of attenuation required

to produce the desired output level (refer to the

accompanying table). The desired output level

may be in millivolts, microvolts, or dB, but must

be converted to dB to correspond with the lab-

elling on the controls. In this unit 0dB =100

millivolts into a50-ohm load.

5. Place as many ATTENUATOR selectors 10 in

the IN position as required to come within 0to

f5dB of the desired total attenuation. All the

other ATTENUATOR selectors 10 must be in the

OUT position.

6. Set the FINE ATTENUATOR control 9for the

additional attenuation, as indicated on the meter

3(this should always be in the 0to —5dB re-

gion of the meter scale).

The total of all ATTENUATOR selectors and the

meter reading equals the total attenuation below

the 0dB (100 millivolt) reference level.

7. Higher levels of output are possible but seldom

required. Levels above -f 2dB must be meas-

ured with external equipment. At these higher

levels, the meter 3will peg, but no damage will

occur since the meter is protected against over-

load damage. For output levels above I- 2dB,

connect an rf voltmeter to measure the output

signal level and adjust the FINE ATTENUATOR

control 9for the desired signal level.

NOTES

A. For greater accuracy, use an unmodulated

signal level (MODULATION switch in CW

position).

B. If the output is not terminated in 50 ohms,

the output level is not calibrated. However,

the meter and ATTENUATOR selectors still

provide indication of relatively higher or

lower level.

C. For ranges H-j and H4,which provide har-

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