RADIOMETER AFM2 Operating Instructions Manual

AFM2 MODULATION METER

,

1

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MODULATION

I

RADIOMETER

COPENHAGEN

n

:

BDE

0

U

I

This

instruction manual for the type in mind:

1)

On

page

AM distortion:

Carrier frequencies within

the range

Carrier frequencies within

the range 300

2) Signal-to-noise ratio for each stereo channel measured with a psophometer: Typically 66 dB at f40 kHz frequency deviation and RF

only when the level of the RF signal

AFM2S6 when the following specification changes and additions are borne

05

read

5

-

300 MHz:

-

1002 MHz:

is

valid for the Modulation Meter, type AFM2, but applies also

for

AFM2S6

0.3% distortion at 30% AM frequencies, within 20 Hz

1.5% distortion at 90% AM and at modulation

10

frequencies within

1.5% distortion at 30% AM and at modulation

frequencies within 10 Hz

<

200 MHz. These data apply

is

in the 30 - 100 mV range.

Hz - 50 kHz.

cmd

-

1~'kHz.

-.50 kHz.

'

at modulation

Furthermore, it applies to the Modulation Meter, type

06,

07,

D6,

E2,

corrections are made on pages

1

)

AF Output

2) AF Output Terminals

Nominally when meter reads 3/4 of ful I-scale deflection, e.g., at *75 kHz deviation in the deviation range.

3-pol e standard, type

and E4:

AFM2S4S5, when the following

0

dh (0.775

V

rms into 600R)

ZNA

333874/1

f

100

kHz

Table

of

Contents

SECTION A SECTION SECTION C SECTION D

1,

Description

2. Controls, Meters, and Terminals

SECTION 1, Connecting the Instrument

2, Measuring Ampl itude Modulation Percentage

3. Measuring Frequency Deviation

4,

Using a Crystal Oscillator

SECTION F - TECHNICAL DESCRIPTION F 1

-

INTRODUCTION

B - SPECIFICATIONS

-

ACCESSORIES

-

GENERAL DESCRIPTION

E

-

OPERATI NG l NSTRUCTIONS

Plurin

Unit, code 900-252

E

E E

E3 E4

1 1

1

1,

RF Input Circuit

2, Tuner

3.

IF Filter IF Preamplifier and IF Attenuator

4,

5, IF Amplifier

P

6, 7,

8.

9,

10, Limiter Stages 11, FM Detector 12, AF Amplifier 13, AF Amplifier Ill 14, AF Detector

1

hase-compensator and Ehnd-pass Filter

Buffer Amplifier

AM Detector

IF Output Amplifier

I

and

I1

-

V

5, Power- Suppl y

SECTION SECTION H

G

-

MA1 NTENANCE

PARTS LIST

Modulation Meter

Type AFM2

Section

Fig

.A1

.

The I'tAodulation i'Aeter,

type

AFM2.

The Modulation Meter, type a solid-state, line- or battery-operated precision measuring instrument for ac-

curate measurement of the modu depth of ation of quency range from Modulation Meter cepting telemetric signals with a modulation frequency up to 200 kHz, and

stereo signals for which it features an

L/R-separation of

The

flection for

and

kti~

srnall amount of residual modulation generated in the

er, it and

F"M

measurer( enfs on distol-ted signuls are

AM

signals and the peak devi-

FM

signals in the carrier fre-

5

to 1002 MHz. The

is

designed for ac-

46

dB.

indicating metel- has fuI I -scale de-

3,

76,

30,

53,

*1C,

t

hl\,

is

possible to measure residual

AM

in

signals, and vice versa. Accilrate

k3C1

peak value. Due to the vely

oscillators, sp~~rious

If;GC,

idiodulation Meter plop-

and

AFM2,

lation

1

0C9h

and

AM

is

AM,

zt2C.C

FM

on

A.

Introduction

rendered easy by a

the positive ue to be measured separately. creased resolution nal indicator, such as a voltmeter,

he

ranges downwards.

The input signal level necessury for

occbracy

cy range

range

the range

mcim operating input

Besidzs a manual level control, the Modulation Meter features

level control with a regulating range of

To increase the versatility of the Modulation Meter for row-band equipment, it two kHz, just as three standal-d deen~phasis networks of non-standard of four low-pass filters with frequencies of

3,

pass filter with

15

tions for a wide

A

900-252,

swit2l.l that enables

and the negative peak val-

is

desired, an exter-

e--plo)/ed to extend

is

3

mV in the carrier frequen-

5

to

200

2CC

to

60C

SCO

to 1003 MHz. The maxi-

ihe

MHz,

Mtlz, and

20 mV in the

voltage

40

dB.

nreasvren;ants on nar-

is

IF

bandwidths of *20 and k400

50,

75,

and 750

6

dB/octave (ref. 1 kHz),

15,

75, and 200

kHz,

ensure optimal measuring condi-

Crystal Oscillator Unit, code

is

available. See

kHz,

3

dB points at 50 Hz and

range of applicatio~s.

and ore band-

If in-

con

measuring

full

30

mV in

is

10

V.

an

automatic

provided with

s,

one

SECTION

C,

Section

FREQUENCY RANGE OF INPUT SIGNAL 5

FREQUENCY RANGE OF

VARIABLE Fundamental ranges: 7-12, 12-21, 21 -37, 37-65, 65-1 10, and

OSCl LLATOR

B.

Specifications

-

1002 MHz

7

-

1000 MHz

11 0-200 MHz

Harmonic ranges: CALIBRATION ACCURACY 3% CRYSTAL OPERATION

INPUT LEVEL

Carrier frequency ranges: Attenuation 0 dB Attenuation 10 dB: Attenuation 20 dB:

+

:

200-330, 330-600, and 600-1 000 MHz

An optional Crystal Osci that accepts up to four switch-selected crystals, ensures low residual FM.

Specification changes due to crystal operation: See

SECTION C

One input socket in connection with a 3-step input attenuator (1 0 input levels from

5-200 MHz 200-600 MHz 600-

l lator Unit, code 900-252,

-

ACCESSORIES.

+

10 + 20 dB) ada,pts the AFM2 to

3

mV to 10 V.

1

000 MHz

Attenuation 30

Attenuation 40 dB:

Max.

Input level for residual

I

safe input level: 10 V

Min. input level

dB:

+

Basic sensitivity range,

4-t

Values in parentheses are derived from

BSR

of

FM

and AM measurements:

(

RF attenuation inserted (dB)

and from lower

BSR

limit

of overlapping ranges.

I

minimum

level

l

NPUT IMPEDANCE

50

R

nominal

LEVEL Manual level setting:

Automatic level setting:

FR

MODULATION Deviation ranges:

Accuracy:

*75

SETTING

EQ

LI

E

NCY

kHz deviation:

Continuous within a range of min.

The AGC system keeps the level setting within

0.5%

fied input level ranges, inclusive of the overlapping ranges.

Fine adjustment of the automatic level setting possible

*3,

deviation).

Positive and negative deviation peaks can be mea-

sured separate ly.

2% of reading quencies within

for input level variations within the speci-

.

*lo,

k30, lt100,

+

1

%

of full scale at modulation fre-

20

Hz - 53 kHz

and

*300

40

dB.

kHz f.s.d.

is

(peak

$300

kHz

deviation:

4%

of reading

quencies within 2% of reading

quencies within

7%

of reading

quencies within

15% of reading

quencies within 125 kHz

Notes:

1.

To obtain specified accuracy, the upper frequency limit of the built-in low-pass filter should be switched as follows:

Deviation range upper frequency limit

k3

kHz

k10

kHz

*30

kHz 15 kHz

&I00 A300

kHz 75 kHz kHz

+

1%

of full scale at modulation fre-

10

Hz - 75 kHz.

-t-

1%

of full scale at modulation fre-

20

Hz - 15 kHz.

+

1

%

of full scale at modulation fre-

10

Hz - 125 kHz.

+

1% of full scale at modulation fre-

-

200

kHz.

3

kHz

15

kHz

200

kHz

~andwidths)

(see

2.

The specified accuracies are valid only with the

METER

lower frequency limit

switch set to SLOW.

is

In position FAST, the

160

Hz.

Distortion

k75

kHz deviation:

0.1 10

%

distortion at modulation frequencies within

Hz

-,

15

kHz.

k300

LR-separation of

AF

kHz deviation:

FM

output and meter response

0.2% 20

0.3% 10

0.5% 20

1 10

3%

10

5%

125

stereo signals: For an ideal FM stereo signal (FCC and EBU-stan-

dard), the LR-separation at modulation frequencies within

distortion at modulation frequencies within

Hz

-

53

kHz.

distortion at modulation frequencies within

Hz

-

75

kHz.

distortion at modulation frequencies within

Hz

-

15

kHz.

.5%

distortion at modulation frequencies within

Hz

-

50

kHz.

distortion at modulation frequencies within

HZ

-

125

kHz.

distortion at modulation frequencies-within

kHz

-

200

kHz.

40

Hz

-

15

kHz

is

greater than

46

dB.

(FM):

AF

output:

Meter response:

Residual

FM:

40

Hz

-

15

Within than

46

dB (see above). This corresponds to a departure from a linear phase response of less than and a frequency response within

(40

HZ

-

53

kHz).

Note:

be used.

Within

of the meter

Notes:

1.

used.

2.

METER

the lower frequency limit

On condition of a quiet test room (noise level

<

Less than

range

'The built-in

40

Hz

is

The built-in

The specified response

switch set to SLOW.

60

dB rel.

5-250

2 x 10-4

25

Hz

MHz; typically

kHz, the LR-separation

+0.25%

200

kHz low-pass filter

-

53

kHz, the frequency response

within

200

FM

+0.25%

kHz low-pass filter

pbar.):

(r.m.s.) within the frequency

and

is

valid only with the

In position FAST,

is

160

Hz.

15

Hz (r.m.s.).

-1.5%.

and

is

to be

greater

0.5'

-1.5%

to

Less than typically

100

50

Hz

FM

(r.m.s.) up to

FM

(r.m.s.).

1002

MHz,

Notes:

1

.

0.1 % of ful l deviation range

2.

Minimum

3.

the built-in band-pass filter (50 Hz - 15 kHz) or one of the deemphases (50 used.

RF

input level: See input Level.

is

to be added.

ps or 75

t~s) is

to be

FM

due

to

AM:

Deemphases: Standard deemphases: Deemphasis:

Additional residual

less than 50 pass filter (50 Hz

50,

75,

6dB/oct. (ref. 1 kHz). For frequency response of filter, see Fig.

The deemphasis can be switched off.

Hz

and 750

FM

error due to

(r. m.s.) at 50%

-

15 kHz)

ps,

switchable.

€31

.

is

AM,

used.

AM

is

typically

when the band-

AMPLITUDE

Modulation depth range:

Accuracy: Manual level setting:

MODLILATION

.

Fig.

€31

.

Frequency response of

6

the

3, 10, 30, and 100%

Positive and negative modulation ~eaks can be mea-

sured separately.

2% of reading frequencies within 20 Hz

5% of reading

frequencies within 10 Hz

Notes:

1.

To obtain specified accuracy, the upper frequency

limit of the built-in low-pass filter should be switched

as follows:

+

1%

1

%

dB/oct. filter.

AM

f.s.d.

of full scale at modulation

-

15

kHz.

of full scale at modulation

-

50

kHz.

modulation range upper frequency range

+

3% 3 kHz

10%

30% 75 kHz

1

00% 200 kHz

+

By a 10

upper frequency limit can be extended to 15 kHz.

2. The above accuracies are valid for modulation depths up to 90% AM within the carrier frequency range 15-300 MHz, and up to 30% AM within the carrier frequency range 300-1 002 MHz.

dB

increase in minimum input level, the

15 kHz

Automatic level setting:

AM

distortion:

Carrier frequencies within the range

5

-

300 MHz:

The following typical values are to be added to the above accuracies:

At a modulation frequency of 20 Hz: At a modulation frequency of 50 Hz: At modulation frequencies above 100 Hz, the addi-

tional error

Note:

ic level settings) are valid only with the

set to SLOW. In position FAST, the lower frequency

limit

0.2% distortion at 30% AM and at modulation

quencies within 20 Hz - 15 kHz.

1%

cies within

The specified accuracies (manual and automat-

is

distortion at 90% AM and at modulation frequen-

is

160 Hz.

10

negligible.

Hz - 50 kHz.

6%

of reading.

1

%

bf

reading.

METER

1

switch

fre-

Carrier frequencies within the range 300 - 1002 MHz:

Residual

AM

at CW:

1

%

distortion at 30% AM and at modulation frequen-

cies within

Less than 0.03%

up to 200 MHz.

Less than 0.1

up to 500 MHz.

Less than 0.3% AM (r. m.

up to 1002 MHz.

Notes:

1.

0.1% of full AM range to be added.

2. Minimum

3. The built-in band-pass

is

to be used.

10

Hz - 50 kHz

AM

(r.m.s.) at carrier frequencies

%

AM

(r. m.s.) at carrier frequencies

s.)

at carrier frequencies

RF

input level: See Input Level.

filter (50 Hz - 15 kHz)

AM due to

FM:

Additional error at 550 kHz deviation.

is

less than 0.6% AM (r. m.s.)

AF output Manual level settings:

Automatic level setting:

l

NTERMEDIATE FREQUENCY CHANNEL

Frequency: 2 MHz Bandwidths:

IF

check:

IF

outputi

(AM)

'the frequency response range 20 Hz

The following typical error contributions are to be added to the above frequency response:

At a modulation frequency of 20 Hz: At a modulation frequency of 50 Hz: At modulation frequencies above 100 Hz, the error

contribution

approx. selected.

The meter has a separate scale to facilitate correct

tuning

2

MHz correct frequency tuning and full scale deflection on meter.

is

within 50.5% in the

-

15 kHz.

6%

1

%

is

negligible.

*400 kHz/3 dB and 525 kHz/3 dB, switch-

(IF

=

2 MHz).

IF

signal of 0.2

V

EMF

from 50 Q source at

AUDIO

Bandwidths:

3

kHz filter:

15 kHz filter:

75 kHz filter:

200 kHz filter:

50 Hz - 15 kHz filter:

AF output:

FREQUENCY

CHANNEL

four switchable low-pass filters, 3 kHz, 15 kHz,

75 kHz, and 200 kHz, to be used when measuring

FM

deviation and AM modulation.

for mod. freq. up to for mod. freq. up to 15 kHz. for mod. freq. up to 75 kHz and for measurements of

FM

stereo deviation.

for mod. freq. up to 200 kHz and for measurements

of stereo

(bandwidth: 10 Hz (0.1 dB) Band-pass filter, 50 Hz (3 dB)

to be used when measuring residual

AF signal of deflection.

Bandwidth as specified above. ac- or dc-coupl ing.

L/R

1

separation.

V

3

kHz

-

350 kHz (3 dB)

-

15 kHz (3 dB),

FM

EMF

(peak value) at full scale

A

switch provides for

)

and AM.

ac-coupl ing: Output impedance: 600

pF.

10

dc-coupl ing: Output impedance; 600

Q

in series with

Q.

dc OLITPUTS

IF

level:

1

V

EMF

dc-voltage of

deflection to set level mark.

from 600 R source at meter

IF

frequency:

Modulation:

POWER Power line:

VoI tages:

Frequencies: Consumption:

External dc

dc sources:

Current drain:

TERM1

SUPPLY

NALS

supply:

dc-voltage of deflection to

dc-voltage of scale deflection.

110

V

and 220

48 - 65

about 25 The power cord

plug of the Schuko type.

0

to

approx.

HZ.

+(I8

400

1

V EMF from 600 R source at meter

IF

CHECK mark (50

1

V

EMF

V,

~10%.

VA.

is

fixed and provided with a mains

to 25

Lq

and 0 to -(I8 to 25

mA from each source.

from 500

mV/100

5:

source at full

kHz).

V)

.

RF

input and AF output: dc output

External - dc supply:

Operating ambient temperature range:

DIMENSIONS AND

Height:

Width:

Depth:

Weight:

MOUNTING

ACCESSORIES

(AF):

AND

IF

output:

FINISH

SUPPLl

WEIGHT

ED

B

NC UHF Banana jacks Bel

l

ing Lee

197

mm

485 mm

245 mm

13

kg (28.6 Ibs)

Steel cabinet finished in grey enamel lacquer.

1

coaxial cable

UG-88/U BNC plugs.

type

(7

3/4

(19

(9

5/8 in.)

1.1

1/8

436;'s

in.)

(50

O),

code 017-004, with

ACCESSORIES

AVAl LABLE

1

battery plug, Belling

Crystal Oscillator, code 900-252.

1

set of dust covers (top plate and bottom plate)

for rack mounting, code 884-002

&

Lee,

L1436/P,

code 805-429.

Section

C.

Accessories

PLUG-IN CODE 900-252

General The Plug-in Crystal Oscillator Unit,

code 900-252,

in the frequency range 80 to achieve low residual plied without crystals.

The Crystal Oscillator Unit contains crystal-controlled oscillator followed by

a

doubler stage, and to four switch-selected crystals. The crystals are mounted inside the unit and can easily

ment

CRYSTAL

is

be

exchanged. Initial adjust-

is

made by means

OSCILLATOR UNIT,

preferably used with-

-

1000

MHz

FM.

It

is

sup-

a

it

has room for up

of

individual

Fig.

C1.

The Crystal Oscillator Unit,

code

900-252.

screw-driver adjustments on the front

.

panel The trimmers directly cover a tuning

range of 360

80

-

120

fixed capacitor must be added in parallel

with the trimmer.

MHz

-

1000

and

MHz.

250

In the ranges

-

360

MHz,

a

Specifications

Number of crystals:

sockets for up to

4

crystals.

Frequency of crystals:

lni tial conditions:

In order to achieve the highest possible sensitivity of the modulation meter, the frequency of the crystals must be as high as possible. Overtone crystals

-

100

having frequencies within the range 40 are recommended. The crystal frequency f termined by

f -2

f=

cr 2n

where f indicates the carrier frequency and n the odd harmonic of the crystal overtone-frequency.

The sensitivity specifications, item are based on the following combinations of carrier frequency, order of harmonic, and range of crystal

frequencies.

Carrier frequency

s

f

s

Order of harmonic

MHz

n

l

NPUT

Range of crystal

frequencies

MHz

is

cr

LEVEL,

f

cr

de-

Characteristics of the crystals:

Type:

Frequency: Frequency tolerance: Frequency tolerance over

operating temperature range:

Condition of resonance: Mode of operation: Max. drive level: Max. equivalent series

resistance:

250 - 600 MHz 600 - 1000 MHz

HC-25/U See above. 10 x

10

x

Series

5.

overtone

2

mW

at reference temperature 25

within 0-50'~

3

5

4060

-

0

C

l00MHz

I00

MHz

CHANGE

CAUSED BY THE CRYSTAL OSCILLATOR

lnput level: Frequency ranges: 250

Attenuation 0 dB

IN

SPECIFICATIONS OF AFM2

+

:

-

20 - 100 mV 30 - 100

600 MHz 600 - 1000 MHz

mV Attenuation 10 dB: Attenuation 20 dB Attenuation 30 dB: Attenuation 40 dB:

Max. safe

lnput level for FM and AM

measurements: 250

-

in~ut level: 10

600 MHz:

(60)* (200) (0.6) (2)

+

Basic sensitivity range, BSR

u

level of

ranges.

I

-

100 - 300 mV 100 - 300 mV

-

300 - 1000 mV 300 - 1000 mV

- 1 -

- 3 -

Values

V

Min. input level 1 RF attenuation inserted (dB)

3 V 1 -3V

1OV

in

parentheses are derived from minimum

BSR

and from lower

3-10V

limit

of*overlapping

I

600

-

1000 MHz:

Residual FM:

1

Min. input level

Less than 20 Hz FM (r.m.s.) at carrier - frequencies

to

up

1 . 0.1 % of fu

2. Minimum RF input level: See lnput Level.

3. The built-in band-pass filter (50 Hz or one of the deemphases (50

1002 MHz; typically 15 Hz (r.m.s.).

11

1

RF

attenuation inserted (dB)

deviation range

ps

is

to be added.

-

15 kHz)

or

75 ps)

is

to be used.

(

Residudl AM at

CWo

Less than 0.15% (r.

to 1000

Notes:

1

.

MHz.

0.1 % of full

AM

m.

s.) at carrier frequencies up

range must be added.

2.

Minimum

3.

The built-in band-pass filter (50

is

to be used.

RF

input level:

See Input Level.

Hz

-

15

kHz)

Section

D.

General Description

DESCRIPTION As can be seen on the

diagram shown in signals to the 50 are fed to a diode mixer via an input attenuator providing for 10, 20, 30, and 40 dB attenuation and thus accom-

RF

modating r.m.s. The mixer, which

highly linear, so that distortion of

and

amplitude-modulated signals

is

coupled to the local tuning oscillator.

RF

For

5 to 200 MHz, mixing

the fundnmental frequency of the local oscilla:or, whilst it takes place with the third and fifth harmonics in the range from 200 to 1002 MHz. sults in an mixer can also be coupled to an option-

al Crystal Oscillator Unit,

252, which can accommodate four crystals, thereby enabling measurements at four predetermined, fixed frequencies.

the signal from the mixer through an IF filter, which

linear band-pass filter with of

1400 kHz, a high degree of phase-

linearity being necessary in order to pass a multiplex stereo signal with min-

imum distortion. From the

to an buffer. At the same time, the

IF

signals from 3 mV to 10 V

input signals in the range from

IF

signal of 2 MHz. The

IF

filter, the

preamplifier which acts as a

simplified block-

Fig.

Dl

,

the

Cl

coaxial connector

is

balanced

is

realized with

code

is is

a

bandwidth

IF

signal

RF

input

avoided,

This

re-

900-

passed a phase-

is

fed

IF

pre-

amplifier provides for the

IF signal. gether with ideal coupling to the filter, keeps the noise level down to a minimum at all input levels.

The

IF

preamplifier diode attenuator whose biasing current can be controlled

LEVEL, accessible on the front panel of the Modulation Meter. Level control can be performed within a range of 40 dB. Alternatively, the driven by a voltage proportional to the

IF

level amplified in an AGC amplifier.

This

provides for automatic level control within 40 dB. Fine adjustment theless also possible by means of the

potentiometer

The

IF

signal from the then fed to an sists of two wideband amplifier stages. The

IF

amplifier brings the

the level required by the

The

amplified either through through a phase-compensator, according to the position of the

.

The band-pass filter has a band-

trol

width of

just as the use when measuring on weak signals from narrow-band equipment. The phase compensator leaves the initial bandwidth unchanged.

A25

This

LEVEL.

IF

1F

a

kHz and

IF

filter. It

ahplification of

amplification, to-

is

followed

by

the potentiometer

IF

attenuator can be

IF

attenuator

amplifier which can-

AM

signal

band-pass filter or

is

then passed

IF

BANDWIDTH con-

is

phase-linear

is

intended for

is

IF

signal to

detector.

by

never-

IF

a

is

A buffer amplifier separates filters, AM

detector and sists of a unity-gain amplifier with low output impedance and serves to suppress any influence from the is

available for external monitoring from

a coaxial connector on the front panel.

IF

The

is

fed both to the AM detector and to

the

IF

output amplifier. The AM detec-

tor

is

an amplifier with a mean-value

detector in the feedback loop which

also provides for the large amount of linearity required. The AM detector has

a

dc and an ac output. The first of these strument via the FUNCTION selector.

In the corresponding position of the FUNCTION selector, the meter indicates the value of the AM detector's

dc current

el. The second output of the AM detector below) via the selector FUNCTION.

As stated above, the buffer amplifier

output amplifier which provides for amplification so that the level required for driving a following limiter

The limiter transforms the a square wave, the zero crossing of

which

peak-to-peak value being compared with

variations in the mean value. Subsequent

limiting action takes place in the following limiter section. The resulting signal

is

detector section which consists of a

monostable multivi

amplifier. The signal from the last limiter section

is

vibrator which provides for pulses of constant width. The tivibrator are amplified in an output amplifier. The output

with a regulating loop consisting of a

peak detector and an amplifier. regulating loop keeps the value of the peak-to-peak voltage of the output am-

is

coupled to the AF section (described

is

fed via a buffer amplifier to the

used to trigger a monostable multi-

IF

output amplifier. It con-

IF

output which

signal from the buffer amplifier

coupled to the meter of the in-

-

in other words: the IF lev-

IF

signal from the

is

also fed to the

is

obtained.

IF

signal into

controlled by variations in the

IF

FM

brator and an output

pulses from the mul-

amp1 ifier

is

provided

This

pl ifier constant. Hence, as the amplitude and the width of the pulses are constant, the mean value of the signal will vary according to the number of pulses per second. The mean value

when the

sition IF CHECK for reading the value of the intermediate frequency. To ensure a

high degree of accuracy and an extreme-

ly low hum level, both the multivibrator

and the output amplifier are furnished

with their own regulated power supply.

From the AM or

is

fed to a low-pass filter via a relay controlled by the FUNCTION selector. The low-pass filter features the

gree of ing stereo information without any disturbing influence on

The low-pass filter two-section, uator which determines the metering ranges. providing for amplification signal to the level required by the next stages.

The AF amplifier phasis networks providing for the stan-

dard deemphases of 50, 75, and 750

and the non-standard deemphasis of dB/oct. The amplified AF signal can also be passed through one of four pass filters with frequencies of

75 and 200 kHz, or through a

pass filter with 3 dB points at 50 Hz and 15 applications.

These networks and filters are followed by an AF amplifier. from this amplifier front panel via the AF OUTPUT connector for distortion measurements or external monitoring. OUTPUT does not interfere with the me-

ter indication. The output voltage from the first AF amplifier other AF amplifier providing for the voltage necessary for the AF detector. The signal from the AF OUTPUT can either be dc-coupled or ac-coupled to

FUNCTION selector

FM

detector, the signal

phase-l inearity required for pass-

L/R

is

4

x 10 dB precision atten-

It

is

followed by an amplifier

is

followed

kHz,

ensuring a wide range of

is

utilized

is

in po-

high de-

separation.

followed

of

by

the

deem-

a

AF

pi,

6

low-

3,

15,

band-

The output signal

available on the

Loading of the AF

is

also fed to an-

q-

-

R

F

Input

XI1

R

F Local

Att.

t

Mixer

-

ROMAN FIGURES REFER TO

DIAGRAM NUMBER

*.N AUTO

TUYlYC

\

osc.

..,,,""""G

/

111

\

I

Em

/

"!t!!%!!!H

,,9.".

u

..O~.".

I

v

I

-

11

IF Frequency

"~*.!tEE

4s

I

1

I F

111

IF

Output

1

L

\r

VI

7,

VII

10

2"

\

Att.

XI1

-

Low Pass

Filter

\\

Vlll

\

'

-

\

_FM+

IF Check

/

"-

/

I..,~.

-8

VIIL

/

Fig.

Filters

Deem-

phases

/

I

$.YE!.!

Kl°C

m

Dl

. Block-diagram of

-

IF

Level

I

x

olF Check

I

the

\

1.

\

,,"El

.SZ.<G.

SLOW

lbl,

WG- ,C".,U

I

l__(.l.l,l.l,e*.

Em

Modulation

Meter,

\

I.

C*ICI

type

\

Y%"

zi::

AFM2.

IF

CHICI

Level

the AF OUTPUT connector by sliding

the switch.

tions according to the position of the switch MAN.-AUTO.

The AF detector gives the true peak value of any AF signal. Depending on the position of the FUNCTION selector, the positive or the negative modulation peak can be measured. The AF detector has

two time constants, thereby furnishing

two meter responses. The AF detector

pedance-matching network providing for

low output impedance to the meter.

CONTROLS, General

As can be seen in Fig. D2 and Modulation Meter, type

provided with the following controls,

meter, and terminals: Controls, Meter, and Front Plate Termin-

als (see Fig. D2)

Power Lamp and

The power switch monitored

RANGE Selector and Drum Scale (2) The selector RANGE

tion rotary switch. In the first six po-

sitions, the RANGE selector provides

for selection of the frequency ranges according to the table printed on the front plate of the instrument. (Note that the ranges frequency bands.) The next position a rest position. In the last position, the plug-in Crystal Oscillator Unit (if any)

is

monitored

ately above. TUNING Knob (3)

The knob TUNING provides for adjust-

ment of the local oscillator frequency

at

2

is

monitored by a cursor on the drum scale.

LEVEL Potentiometer (4) and MAN.

AUTO. Switch

by

is

connected. The selector

MHz from the signal frequency. It

is

followed

METER,

the lamp POWER.

E

by

AND

ON

switch (1)

OIV

is

and F .each cover two

the drum scale immedi-

by

TERMI

D4, the

AFM2,

a toggle switch

an eight-posi-

(5)

an im-

NALS

is

RANGE

-

When the switch MAN. -AUTO. position ter

instrument manually within a range of

min. 40 dB. When the switch MAN.-AUTO.

,position AUTO., the LEVEL potentiome-

ter automatical

i

nstrument. FUNCTION Selector The selector FUNCTION

position rotary switch. The position

LEVEL

nal

IF

level. When measuring, the positions

IF

ment to the exact carrier frequency. (See under "Meter" below) The percentage of amplitude modulation of AM signals can be measured by placing the

selector in position AM cording to the sign of the modulation peak to be measured. The frequency deviation of sured

FM

the modulation peak to be measured.

METER

'the selector position rotary switch. Each position corresponds to the fu

the meter, viz: AM

loo%,

METER

The switch

In position SLOW

meter response should not be used when measuring on signals with modulating frequencies higher than 160 Hz.

mod

fast.

IF

MAN.,

is

used to vary the sensitivity of the

is

used for fine-adjustment of the

ly adjusted sensitivity of the

the LEVEL potentiome-

(6)

is

a

is

used when searcfiing the sig-

(i.e., tuning) and monitoring the

CHECK are used to tune the instru-

+

or AM - ac-

FM

signals can be rhea-

by

placing the selector in position

+

or FM - according to the sign of

RANGE

FM3

Switch

>I60 Hz, the meter response

BANDWIDTH

Selector

METER

-

10

-30

(8)

METER

is

(9)

(7)

RANGE

l

I-scale range of

3

-

10 - 30

-

100

-

is

a sliding switch.

fmod >10 Hz, the

slow. This position

In

position FAST

is

seven-

is

a five-

300kHz.

in

-

is

The potentiometer LEVEL has two func-

The switch IF BAbIDWIDTH

is

a sliding

Fig.D2. Front plate of the Modulation Meter, type AFM2.

switch. It provides for switching from the band-pass filter to the phase-comparator and vice versa, width of k25 kHz to one of k400kHz.

AF

FlLTER/DEEMPHASIS Selector (1 0)

The selector AF a nine-position rotary switch. In the scales. first position

a

band-pass filter

used when measuring residual AM and

FM.

kHz

REO),

pass filters are switched in. They are used when measuring

AM

filters are used for modulation frequencies up to 3 kHz and 15 kHz, respective-

In the next four positions - 200

(L/R

STEREO), 75 kHz

15 kHz, and 3 kHz - four low-

modulation. The 3 kHz and 15 kHz

FI

-

50 Hz- 15 kHz (3 dB)

i

.

e

.,

from a band-

LTER/DEEMPHASIS

is

switched in. It

(A

f,

FM

deviation or

is

-

is

STE-

IY.

is

The 75 kHz filter tion frequencies up to 75 kHz and for measurements of The last filter - 200 kHz modulation frequencies up to 200 kHz and for measurements of stereo L/R separation (bandwidth: 10 Hz (0.1 dB)

-

350 kHz (3 dB)

The last four positions of the AF FILTER/ DEEMPHAS

emphases of 50

IS

selector introduce four de-

p,

used for modula-

FM

stereo deviation.

-

is

).

75p

(European and

used for

American standard for stereo work), 750

ps (narrow-band equipment) and a 6 dB/

oct (non-standard)

Meter

The meter of the Modulation Meter, type sion type. It

The upper scale

ing in the AM ranges from

0 to

or from viation, according to the positions of the FUNCTION selector and the RANGE selector. It with a LEVEL mark to permit setting of

IF

the

The middle scale (12) provides for read-

ing in the AM ranges from 0 to 3% or

0

to 30%, and in the 0 to 3 kHz, Oto30kHz, or 0 to 300 kHz deviation, according to the position

of the FUNCTION and

I

ec tors.

se

The lower scale (13) checking the frequency of the converted

signal. viation around the 2 MHz intermediate

frequency. An for exact tuning to the intermediate fre-

quency

AFM2,

loo%,

0

to

level.

It

.

is

of the taut-band suspen-

is

provided with three

(1

1)

provides for read-

0

to 10%

and in the

10

kHz or 0 to

is

graduated for k300 kHz de-

IF

CHECK mark provides

FM

ranges

100

kHz de-

also provided

FM

ranges from

METER

is

utilized when

RANGE

METER

lOdB lOdB 20dB

Fig. D3. Attenuation and sensitivity ranges.

FREQUENCY RANGE

15

-

200

MHz

ATTENUATION

0 dB 3-100mV 20-100mV 30-100mV

200 - 600

MHz

600 - 1000

MHz

AF

OUTPUT

Connector The AF

switch used for selection of the mode of coupling of the AF signal. With the switch in the left-hand position, the AF signal with

10

right-hand position, the AF

coupled (600 R). The AF signal of

EMF

(peak value) at full-scale deflec-

tion

is

delivered via a UHF connector.

RF

INPUT

The BNC connector

for connection of the measured on.

Input Attenuator The input attenuator

tenuator to adapt the Modulation Meter, type AFM2, to input levels from 3 mV to

10

V.

As

degree of attenuation to be selected depends on the input voltage range, and

the sensitivity of the instrument on the frequency range.

IF

OUTPUT

The UHF connector for connection of the 2 MHz

to, for example, external monitors. It delivers a 2 MHz

EMF

from a 50 ohms source at correct frequency tuning and full deflection on the meter.

Plug-in Unit Receptacle

The Modulation Meter, type

is

so designed that two optional

Switch and AF OUTPUT

(1

4)

OUTPLIT switch

is

ac-coupled (600 R in series

$).

With the switch in the

Connector

RF

(1

6)

is

(10

+

10 + 20 dB). It

can be seen in Fig. D3, the

is

a sliding

signal

is

(15)

INPUT provides

RF

signal to be

a three-step at-

is

(17)

IF

OUTPUT provides

IF

signal

IF

signal of 0.2 V

(1

8)

AFM2, dc supply be means of a Belling & Lee

lug-in

dc-

1

V

used

units, code 900-252, and External-Oscillator Amplifier, code 900-253, can be easily plugged in. CESSORIES.)

Rear Terminals (see Fig. D4)

IF

The terminal banana jacks (600 output voltage of flection to

IF

The terminal banana output voltage of

deflection to MOD. The terminal MOD.

of two banana a dc output voltage (meter current) of V

Line Voltage Indicator (4) The line voltage indicator shows the

line voltage to which the instrument switched: either to 65

(6) are loosened, the voltage indicator can be turned to the appropriate position. (For further details see SECTION

E

Battery The terminals BATTERY are of the Belling

&

nection of the instrument to an external

L1436P Plug supplied with the instrument.

i.e., Crystal Oscillator Unit,

(See SECTION C

LEVEL (DC)

FREQ. (DC)

iacks (600

LEVEL

(1)

IF

LEVEL

R) and delivers a dc

1

SET

LEVEL

(2)

IF

FREQ.

IF

CHECK mark.

(DC) (3)

consists of two

V

EMF

mark.

consists of two

R)

and delivers a dc

1

V

EMF

LEVEL

iacks (600 R) and delivers

EMF

at full-scale deflection.

11

0

V

or 220 V - 48

Hz.

When the two screws (5) and

-

OPERATING INSTRUCTIONS.)

-

AC-

at meter de-

at meter

(DC) consists

(7)

Lee L1436/5 type and provide for con-

is

1

Fig.D4. Rear terminals of the Modulation Meter, type

AFM2.

Section

Before connecting the instrument to the power line, make sure that the supply transformer and the line voltage indicator are set to the voltage of the power

l

ine.

To prepare the instrument for

220

V

line voltage operation, refer to

diagram XI and proceed as follows:

1)

If the instrument must be used at a

line voltage of

3

and 5 and lugs 4 and 6 on the sup-

ply transformer.

2)

If the

line voltage of

4

and 5 on the supply transformer.

Then loosen the screws on the voltage indicator and set the indicator to the

desired voltage.

MEASLIRI

instrument must be used at a

NG

11

0

V,

interconnect lugs

220

V,

interconnect lugs

AMPLITUDE MODULA-

110

E.

V

or

Operating Instructions

3)

Set the switch BANDWIDTH to

kHz when measuring on broad-band equipment, or to suring on narrow-band equipment.

4)

Set the switch

the modulation frequency of the signal

is

less than

160

FAST.

5) Set the switch

MA

N

.

6)

Set the drum scale to the desired frequency range selector.

7)

Set the selector FUNCTION to LEV-

EL.

8)

Set the tuning knob so that the cur-

sor on the drum scale indicates the signal frequency so as to obtain maximum meter deflection.

*2

rt400

*25

kHz when mea-

METER

Hz; otherwise set it to

MAN.

by

using the RANGE

MHz, and then tune

to SLOW if

-AUTO. to

Modulation Percentage of AM Signals

1)

Feed the signal to be measured to

RF

the that the max. applicable signal r.m.s., and that the input impedance

is

2)

ing to the instructions printed on the

front panel, or refer to Fig.

TION

INPUT connector. Bear in mind

50

R.

Use the RF input attenuator accord-

D

-

GENERAL DESCRIPTION.

D3

is

10

V

in SEC-

9)

Turn the selector FUNCTION to

CHECK.

10)

Make a fine adjustment with the

TUNING knob so that the meter reads

IF

CHECK.

11)

Set FUNCTION to LEVEL. When using MAN.-AUTO. in position MAN. readjust to the sary by means of the LEVEL potentiometer. When using MAN. -AUTO. in position AUTO., fine level-adjustment can

LEVEL mark, if neces-

IF

be accomplished by means of LEVEL.

It

is

recommended to use the AUTO. switch in position AUTO. when performing evitable level variations of the signal then are equalized.

12) In order to obtain

select the low-pass filter corresponding

to the modulation frequency of the

Modulation Frequency

50 kHz

15 kHz

AM

measurements, as the in-

the

MAN.

best accuracy,

-

sig-

El,

nal under test. See Fig.

SECTION

to der

"AM

13)

Turn FUNCTION to

depending on which peak of modulation

is

to be measured.

14)

Rotate the selector

until a proper deflection

15)

Read the modulation percentage. Check if the reading both peaks of modulation: a difference indicates distortion of the modulation envelope. See Fig. SECTION

"AM MODULATION Distortion".

Residual AM on

B

-

SPECIFICA'I'IONS un-

MODULATION Accuracy".

AM

METER

is

E2, and refer to

B

-

SPECIFICATIONS under

FM

Signals

and refer

+

or AM

RANGE

is

obtained.

the same for

-

,

20 Hz

c

-

10 Hz

5 MHz

Fig. percentage measurements.

Modulation Frequency

50 kHz

15 kHz

20 Hz

10 Hz

5 MHz

Fig.

percentage measurements.

-5%of reading + 1% of f.s.d.-

El

.

Accuracy of modulation

E2.

Distortion for modulation

-

-+

Carrier

300MHz 1002 MHz

300 MHz 1002 MHz

Frequency

Carrier Frequency

Proceed as described above. If resolu tion somewhat higher than that corresponding to the 3% AM range external meter, e. g., an electronic voltmeter, may be connected to the AF OUT-

PUT connector. The external meter will read

1

volt for full deflection of the in-

ternal meter, RANGE selector set to

tion percentage read on the voltmeter

is

0.003% per mV.

The minimum residual AM reading for a given deviation caused by the instrument itself can be estimated as follows:

1)

Apply

to LEVEL.

2)

Rotate the TUNING knob back and

forth so that the intermediate frequency

is

changed over the range 2 MHz - A f to 2 MHz viation of the frequency-modu lated sig-

nal whose residual AM (Check the frequency change with the

IF

CHECK scale.)

3) Read the

change in the LEVEL reading. The minimum residual AM

this percentage change.

i.e., with the

a

CW

signal and set FUNCTION

+

Af, where Af

peak-t~-~eak value of the

is

wanted, an

METER

3,

the modula-

is

the de-

is

to be measured.

approx. half of

-

MEASURING FREQUENCY DEVIATION

(FM

kHz)

FM

Frequency Deviation of

1)

Feed the signal to be measured to

RF

the that the and

2)

ing to the instructions printed on the front panel, or refer to Fig. D3 in SEC-

TION

3)

k400

equipment, or to suring on narrow-band equipment.

4)

the modulation frequency of the is to

5) Set the switch MAN.-AUTO. to

MA

INPUT

hax. applicable signal

thatthe input impedance

Use the

D

Set the switch

kHz

Set the switch

less than 160 Hz; otherwise set it

FAST.

1\1.

connector. Bear in mind

RF

input attenuator accord-

-

GENERAL

IF

when measuring on broadband

k25

METER

signals

is

10

is

50

R.

DESCRIPTION.

BANDWIDTH to

kHz

when mea-

to SLOW if

signal

V

E3,

signal under test. See Fig. to

SECTIOI\I

"FM MODULATION

der

13)

Turn

depending on which peak of modulation

is

to be measured.

14) Rotate the selector

until a proper deflection

15) Read the modulation deviation. Check if the reading

Modulation Frequency

200

kHz

125

kHz

75

kHz

53

kHz

15

kHz

----

---2%

B

-

SPECIFICATIONS un-

FUNCTION

15% of readinq + 1% of f.s.d.

7%of reading + l%of f.s.dr 4%of readinq + 1%of f.s.d.

---

---------

of

reading

+1%

to

FM

METER

is

of

t

and refer

-

Accuracy".

+

or

FM

RANGE

is

obtained.

the same for

I

-,

6)

Set the drum scale to the desired frequency range by using the RANGE selector.

7)

Set the selector

FU

NCTlON to LEV-

EL.

8)

Set the cursor on the drum scale indicates the signal frequency tune so as to obtain maximum meter deflection.

9)

Turn the selector FUNCTION to IF

CHECK.

10)

Make a fine adjustment with the

TUNING

52

knob so that the

MHz, and then

TUNING knob so that the meter reads

IF CHECK.

11)

Set the selector FUNCTION to

EL. When using

tion

MAN.,

When using MAN.-AUTO. in position AUTO., fine level-adjustment can be accomplished by means of LEVEL.

12)

in order to obtain the best accura-

cy, select the low-pass filter corresponding to the modulation frequency of the

MAN.-AUTO.

readjust to the LEVEL mark.

LEV-

in posi-

20

Hz

10

Hz

')

Fig.

deviation measurements.

Modulation Frequency

200

kHz

125

kHz

75

kHz

53

kHz

Fig. deviation measurements.

4%of reading + l%of f.s.d.

7%of reading + 1%of f.s.d. +75

E3.

Accuracy of frequency

E4.

Distortion for frequency

*75

kHz

Frequency Deviation

1300

Deviation

*300

kHz

Frequency

kHz

both peaks of modulation: a difference

indicates distortion of the modulating

envelope. See Fig.

SECTION

"FM

B

-

MODULATION - Distortion".

E4, and refer to

SPECIFICATIONS under

Residual

Proceed as described immediately above. Because of the very effective limiter

stages in the

FM

quite low, viz. 50 Hz (r.m.s.) at 50% AM when the band-pass filter (50 Hz

15 kHz)

carrier frequency within 15

is

less than 25 Hz

less than 100 Hz

1

002 MHz, when measurements are performed in a room with an acoustical noise level lower than 60 dB (rel. 2

10-4 pbar) and the band-pass filter (50 emphases (50 ps or (See SECTION

If a resolution somewhat higher than that corresponding to the 3 kHz deviation range

meter can be connected to the AF OUT-

PUT

read internal meter,

switch set to thi: electronic voltmeter will be 3 Hz per

US1

IN UNIT, CODE 900-252

FM

on CW and AM sianals

FM

detector, the residual

caused

Hz

terminals. The external meter will

1

mV.

NG

by

amplitude modulation

is

used. The residual

FM

(r.m.s.) up to

-

15 kHz) or one of the de-

75

B

-

SPECIFICATIONS.)

is

wanted, an electronic volt-

volt for full deflection of the

i.e., with the

3,

the deviation read on

A CRYSTAL OSClLiATOR PLUG-

FM

at a

-

250 MHz

(r. m. s.), and

:IS)

is

used.

METER

is

-

Fig.

ES.

The arrows show screws and plate to unit

Crystal Oscillator Unit (see Fig. E5).

2) Supply the Crystal Oscillator Unit with Crystals. Bear in mind that the crystals must have the frequency f defined below:

where fs indicates the carrier frequency

and n the odd harmonic of the crystal

overtone frequency. The sensitivity spec-

ifications (see item

SECTION C

are based on the combinations shown

below of carrier frequency, order of harmonic, and range of crystal fre-

quencies.

3) Position the Crystal Oscillator Unit in the Modulation Meter and fasten the

two screws.

be

removed when a pl!-i.2-in

is

to be used.

is

f -2

f=

c

r 2n

S

-ACCESSORiES or Fig. E6)

MHz

INPUT LEVEL in

to be placed

C

r

1) Remove the two screws and the plate

covering the receptacle in which the

Carrier frequency

Order of harmonic

4)

Switch the

tion

G

RANGE

-

"CRYSTAL OSCILLATOR".

Range of

selector to posi-

-rystal freqbencies

5)

Tune the Modulation Meter to the

desired carrier frequency.

6)

Switch the function selector to IF

CHECK.

7)

Switch to the desired channel by means of the four-position selector.

8)

Insert a screwdriver in the hole corresponding to the selected channel, and adjust the corresponding trimmer until the meter indicates

the

Crystal Oscillator Unit

IF

CHECK.

9)

If

necessary, repeat steps

until all four channels are trimmed.

10)

'the Crystal Oscillator Unit, code

900-252,

Proceed as described above for

FM

measurements, but keep in mind that certain specifications of the Modulation Meter proper cannot apply, and refer to SECTION C under "Change in Specifications of AFM2 Caused by the Crystal Oscillator Unit", and see Fig.

is

now ready for use.

FREQUENCY RANGE

6

AM

to 9

or

E3.

Fig.

E6.

Attenuation and sensitivity ranges when the Crystal Oscil lator Unit,

code 900-252,

is

in use.

AT'TENUATION

0

dB

10

dB

20

dB

30

dB

40

dB

250 - 600

20 - 100 rnV 100 - 300 rnV 300 - 1000 rnV

1

3-1OV

MHz

-3V

6.00

-

1000

MHz

30 - 100 rnV

100 - 300 rnV

300 - 1000 mV

1

-3V

3-1OV

Section

F.

Technical Description

RF

l

NPUT CIRCUIT

RF

The connector on the front plate of the instrument, then passed through a resistive attenuator

20

which of the mixer and to adapt the Modula-

tion Meter to 3

mV to 10 V r.m.s.

All

numbered between 1300 and 1399. TUNER (See diagram No.

The local oscillator consists of (2103 in a common-base Hart ley same circuit configuration ranges. Only the tank circuit and LA) and the emitter capacitor CA are exchanged to obtain the different fundamental ranges from

Up to 200 MHz, the mixing takes place

with the fundamental frequency of the

local oscillator. Mixing with input signals which have a frequency higher than 200 MHz

or 5th harmonics of the local oscillator. The intermediate frequency

be used; however, only the lower sideband can be used at 5 MHz because the lower frequency limit of the local oscillator

input signal

dB, 30 dB or

is

inserted to avoid overloading

RF

components of the

is

accomplished with the 3rd

2

MHz, and both sidebands can be

is

fed to the BNC

(~rovidin~ for 10 dB,

40

dB attenuation)

signals in the range

RF

attenuator are

1)

coupl ing . The

is

used in all

(CC, CB,

7

to 200 MHz.

is

chosen to

RF

input signal

is

7

MHz.

With the selector

CRYSTAL OSCILLATOR, the local os-

cillator

lator providing for operation at a fixed

frequency, such as the Crystal Oscil-

lator Unit, code

The signal from the that from the local oscillator or the

Crystal Oscillator Unit are fed to the diodes balanced mixer and provide for good insulation between the input terminals and the local oscillator or the Crystal cillator Unit, and thereby reduce the

influence of stray radiation. The resulting 2 MHz signal via

The tuner lias its own current limiters, i.e.,

-12 Al l components of the tuner are num-

bered between 100 and 199.

IF

The output impedance of the mixer matched capacitively to that of the filter. In this fashion, variations of the output impedance of the mixer become uncritical. From frequency signal of a band-pass filter which mixing products.

type, and it has a bandwidth of

is

disconnected, and an oscil-

CRlOl to CR104 which form a

T102.

QlOl

for +12

v.

FILTER (See diaaram No. ll)

RANGE

900-252, may be used

RF

is

fed to the

V,

TI

02, the intermediate

2

It

is

in position

attenuator and

Os-

IF

filter

and Q102 for

is

IF

MHz passes through

reiects unwanted

of the phase-linear

*400

kHz

around the intermediate frequency.

A

high

degree of phase-linearity essary to achieve measurements on FM signals with minimum distortion, especial-

ly when the modulation frequency

All

components of the

bered between 200 and 299.

IF

PREAMPLIFIER

(See diaaram No.

The three-stage IF preamp1 ifier consists

Q301,

of the IF filter against load impedance variations from the same time, it provides for amplification before the signal

uator. Amplification alongside with an

glmost ideal connection to the results in a minimum amount of noise at all input levels. The ohmic part of the IF amplifier input

of

R304,

of

C306. The amplified

fed to the

The IF attenuator (see Fig. F1) consists of R311 and the four diodes R311 and the four diodes form divider with one fixed resistance and the variable resistance resulting from the combination Combining these four diodes ensures linear characteristic and thereby minimum distor-

tion. The resistance value resulting from the above combination depends on the biasing current of the four diodes.

biasing current tor of the current generator sition the base of termined by the reference voltage source

Q311.

thereby its collector current, by means of the potentiometer

EL)

accessible from the front of the instrument. biasing current of the diode complex

CR301 to CR304, and, therefore, in regulation of the sitivity of the

RF

input voltage can be adiusted

means of R345.

Q302, and

IF

and the reactive part by means

IF

attenuator via C308.

CR301

MAN.

The emitter current of Q310, and

This

-

is

of the MAN.-AUTO switch,

Q310

results in regulation of the

IF

level. Finally, the sen-

IF

attenuator at a given

IF

filter are num-

AND

Ill)

IF

ATTENUATOR

(2303.

attenuator. At the

is

fed to the

is

matched by means

IF

signal

CR310 to CR304.

CR302

drawn from the collec-

//

CR303 - CR304.

Q310.

is

at a potential de-

is

nec-

is

high.

It protects

IF

atten-

IF

filter

is

then

a voltage

This

In po-

is

control led

RIA

(LEV-

by

When the switch MAN.-AUTO. position

a voltage delivered fier. The AGC differential amplifier Q512 and Q513 followed by a unity-gain amplifier and Q309. The base of Q513

potential determined by the divider consisting of

R554. The base of Q512 receives a signal proportional to the

AM

any) Q308) of the unity-gain amplifier driv-

ing the exponential amplifier The emitter of Q310 provided by the voltage reference source (3311 . the emitter basis ;oltage of Q310, and thereby the biasing current of the

diodes

control led by the potentiometer

(LEVEL)

All components of the and

300 and 399.

IF

AMPLIFIER (See diagram No. ll

The signal from the then fed to the sists of the two stages 'The a voltage level higher than that required by the provides for compensation of the attenuation in the following band-pass filter or phase-compensator

All

numbered between 300 and 399. PHASE-COMPENSATOR AND

PASS

the amplified a phase-compensator or to a band-pass filter, according to the position of the

IF

BANDWIDTH switch. When the

BANDWIDTH

the phase-compensator

It provides for compensation of the error that arises in the phase error

AUTO.,

R1

detector. The difference signal

is

then fed to the input(base of

CR310 to CR304,

and by the AGC amplifier.

IF

attenuator are numbered between

Q304, Q305 and Q306,

IF

amplifier brings the

the base of

by

the AGC ampli-

amp1 ifier consists of a

B

(LEVEL),

IF

wideband amplifier

R552, R553, and

IF

level from the

is

at a voltage

is

in this case

IF

preamplifier

IF

attenuator

amplifier which con-

IF

AM

detector and thus

.

components of the IF amplifier are

FILTER

(See diaaram No.

IF

signal

is

in position rt400 kHz,

is

due to the theoretical

is

then fed to

is

switched in.

IF

filter.

is

in

Q310

is

Q308

at a

(if

Q310.

RI

B

I)

is

Q307.

signal to

BAND-

lM

IF

phase-

This

at

asymmetry of the

around the intermediate frequency. In

the position WIDTH switch, the band-pass filter switched on. It

IF

the but has a bandwidth of h25 kHz, and

is

signals from narrow-band equipment.

BUFFER AMPLIFIER (See diagram N0.V)

The signal from the phase-compensator or the band-pass filter fer amplifier which separates filter, detector, and output amplifier. It consists of a two-stage unity-gain amplifier

(Q501 and Q502) and serves to suppress

any influence from the signal from the buffer amplifier both to the output

filter concerning phase-linearity

intended for use when measuring on

AM

ampi ifier.

IF

filter characteristic

h25 kHz of the

is

of the same type as

is

IF

detector and to the IF

IF

fed to a buf-

output. The

BAND-

is

AM

is

fed

,

first low-pass filter section

C710 and C711 on diagram the network consisting of R539, and C530. R539 brate the AM detector.

Note: The low-pass filter and the following AF section are described below.

All

the components of the AM detector

are numbered from

IF

OUTPUT AMPLIFIER (See diagram

500 to 599.

(L701, L702,

VII),

R537, R538,

is

used to cali-

via

N0.W

The signal from the buffer amplifier also fed to the IF output amplifier which consists of the four stages Q505, and (3506, and which provides for amplification of the

level required by the following limiter

stages. The two diodes are used to protect the limiter input stage

high

against too

a voltage.

(2503, Q504,

IF

signal to the

CR502 and CR503

is

All

components of the Buffer amplifier

are numbered between 500 and 599.

AM DETECTOR (See diagram N0.V)

The signal from the buffer amplifier

fed to the a three-stage amplifier and Q509 with a mean-value detector

CR505 and CR506 in the feedback loop. The feedback ensures a good linearity.

A pair of output transistors, Q510 and

Q511, provides for two outputs. The signal on the collector of portional to the fed via R546 to the differential amplifi-

er which setting circuitry (described above), and, via R543 and plementary Q515, forming a dc output amplifier delivering voltage to the output. The signal from the collector of Q511 dicating meter which provides for check-

ing of the IF level.

The signal on the collector detected signal which

AM

detector. It consists of

Q507, Q508,

Q511

IF

level.

is

part of the automatic level

R555, to a pair of com-

emitter-fol lowers, Q514 and

is

also fed via R544 to the in-

This

IF

LEVEL

Q510

is

fed through a

is

pro-

signal

(DC)

is

the

All components of the fier are numbered between 500 and 599.

LIMITER Genera

The amplified of three limiters.

All components of the limiter stages are numbered from 600 to 699.

First limiter stage.

The first limiter stage consists of two emitter-coupled transistors, Q601 and Q602. Their working point by the current delivered dc current generator

IF

signal from the fed to the base of Q601, wh t 1st the base of Q602 a sufficient and Q602 are cut-off, and the output

voltage of the first limiter (at

a square-wave. The peak-to-peak value of this square-wave stant current generator Q607. The first

limiter circuit which holds the zero-crossing of the square-wave output voltage. The regulation circuit consists of a

STAGES

I

IF

signal

is

connected to ground. When

IF

level

is

provided with a regulation

IF

output ampli-

(See diagram No.

is

fed to a series

is

determined

by

the constant

Q607. The amplified

IF

output amplifier

is

reached, Q601

C605)

is

fixed by the can-

peak-dif-

VI)

is

ference detector, CR601 and CR602, and

a differential amplifier, Q603 and where any signal from the peak-difference detector

ponent of the square-wave. The output signal of the differential amplifier (if

any)

Q602 via the two emitter-fol lowers Q605 and

Subsequent l imiter stages

From fed to two subsequent limiter stages Q608-(2609 and Q610-Q6ll where it

is

again limited. The resulting signal

then fed to the

FM DETECTOR (See diagram No.VII) The

mu1 tivibrator and an output stage. The multivibrator consists of

Q702. It positive pulses from the last stage.

base of Q701 via

is

cut-off when no to its base whilst transistor Q702 conducts, and conversely.

is

compared with the dc com-

is

fed to the bases of Q601 and

Q606.

C605, the square-wave signal

FM

detector via Q612.

FM

detector consists of a monostable

(2701 and

is

triggered by the train of

I

imiter

This

train of pulses

C701. Transistor Q701

IF

is

signal

fed to the

is

Q604,

is

applied

is

then passed, via a low-pass filter consisting of C711, to the

low.

A positive voltage, varying proportionally to the modulating frequency, drawn from the collector of (2704 and, via R726 and

amplifier stage consisting of the double transistor Q709 and

The amplifier signal present on the

emitter of Q711

IF

FREQ.

part

is

fed via R736 to the meter when the selector FUNCTION position. R737 and R739 provide for fine adjustment of and gain.

The monostable

'

output own +10 supplies. 'they consist of Q615 and Q616 for +10 Q618, Q619 and Q620 for -10

(See diagram

All components of the

numbered between

stage are provided with their

L701, L702, C710 and

AF

section described be-

is

R727, fed to a unity-gain

Q710 and Q711.

is

fed via R734 to the

(DC) output, whilst the other

is

in

IF

CHECK

IF

CHECK position

mu1 tivibrator and the

V

and

-1

0 V regulated power

Q613, Q614,

V,

and Q617,

V.

VI)

FM

detector are

700 and 799.

multivibrator has a time-constant

The determined by and it delivers a square-wave signal across the output stage which consists of and two transistors of the output stage are determined by the constant dc current generator square-wave amplified in Q705 and turn drive the constant-current generator Q708 via Q707, thereby regulating

amplitude variations. As the width of the pulses and their amplitude are constant, the mean value of the output voltage of the output stage will vary according to the number of pulses per second of the square-wave, cording to the modulating frequency.

Frequency-modulation of the will cause a variation of the output voltage of the output stage.

R702. The positive pulses drive

Q704.

R707, R708 and C703,

Q703

The working points of the

Q708. The peak value of the

is

detected by CR704 and

(2706, which in

i

.

e., ac-

IF

signal

This

signal

AF AMPLIFIERS

(See diagram VI 11)

The signal from the AM detector to the second low-pass filter, consisting of

L801, L802, L803, L804, L805, C801,

C802, C803 and C804, when the selector

FUNCTION

AM. The signal from the

is

fed to the second low-pass filter

when the selector FUNCTION

of the positions

is

characterized by its good phase-

linearity and its almost flat frequency response, which are both required for passing a stereo signal with minimum

distortion. The filtered signal

the first section of a two-section resistive AF attenuator (see diagram and fed fo the first which consists of Q803.

I

AND

is

in one of the positions

FM.

Q801, (2802, and

I

FM

detector

is

The low-pass filter

is

then passed through

AF

AMPLIFIER,

is

in one

XII)

fed

The amplified signal at the collector of

Q803 of the

and fed to the second AF AMPLIFIER,

which consists of

Q806. amplification and for the low output pedance required for coupling to the subsequent low-pass filter

All components of the AF AMPLIFIERS

I

AF AMPLIFIERS The amplified signal from amplifier

fed to the low-pass filter, which con-

sists

C902, and which provides for limitation of the noise bandwidth in the AF section of the instrument without deterioration of the phase-linearity and response.

The filtered signal the third AF amplifier. amplifier, consisting of Q901 and

which

in when the

is

15

other positions of the selector. For filter characteristics, see SECTION emphasis networks and the are regular RC networks.

The following AF amplifiers IV and V, consist respectively of Q906, Q907, and Q9Q8, Q910, Q911 and

is

passed via the second section

AF

attenuator (see diagram XII)

04,

It

provides for the necessary

'3805 and

.

and

II

are numbered from 800 to 899.

Ill

-

V (See diagram

of L901, L902, L903, C901, and

frequency-

is

then passed through

It

is

a unity-gain

is

part of the active filter switched

FI LTER/DEEMPHASIS selector

in

position 3 kHz, 15 kHz and 50 Hz

kHz

(3

dB).

It

acts as a buffer in the

FILTER/DEEMPHASIS

B

-

SPECIFICATIONS. the de-

6

dB/oct filter

Q903, Q904, Q905,

im-

1X)

II

is

Q902,

-

Q912. They bring the signal up to the

level required by the AF detector.

is

The AF OUTPUT signal the emitter of AF

OUTPUT switch and via R920 and C911 when the AF OUTPUT switch

All the components of the AF amplifiers

111

-

V

are numbered from 900 to 999.

AF DETECTOR (See diagram X)

The signal from the emitter of fed to the AF detector which consists of

diodes

is

of modulation, whilst diode for detection of the positfve modulation peaks. Selection of the peak of modulation (positive or negative)

means of the FUNCTION selector in the positions AM or FM.

The detected signal

impedance converter so that fed to the and to the meter.

All the components of the AF detector

are numbered from BOWER SUPPLY (See diaaram

The power supply provides for the regu-

lated dc voltages (-12 V,

required by the different sections of the

instrument. (For -10 V and +10 V sup-

ply, see FM DETECTOR.)

All the components of the power supply

are numbered from 11

CRl 001 and CR1002. Diode CR1002

used for detection of the negative peaks

C907 via R920 when the

is

in position AC.

is

MOD.LEVEL (DC) output

1000 to 1099.

drawn from

in position DC,

(2912

CRl 001

is

done by

then fed to an

it

can be

XI)

0 V, +12

00 to 11 99.

is

V)

used

Section

G.

Maintenance

The following maintenance procedure found defective

factory.

instruments necessary to make these field

the required

TEST

The following

specifications and should possess the

Signal generators (referred to in the text

This

INSTRUMENTS REQUIRED

is

replaced by a new one delivered by Radiometer and prealigned at the

procedure reduces adjustments in the field to a minimum. However, the test

standard of performance of the

is

a

list

of preferred instruments. Any alternatives must have equivalent

is

same degree of accuracy.

based on the assumption that

adjustments must be of high quality to achieve

my

printed circuit

AFM2.

as

Sig-Gen.) to cover

5

-

1000

MHz,

50

R

impedance,

1

Hewlett Packard

1

Hewlett Packard

1

Hewlett Packard

AF

1

1 1 1

Oscillator, for example': Radiometer BKFIO, distortion

the text as

Oscilloscope, for example, Philips PM3231

DC

DVM (digital voltmeter), Hewlett Packard 3403A

AC

DVM, Hewlett Packard 3430A

AC

VTVM,

as

follows:

606B

(50 kHz-65 MHz)

608E

(1

0

MHz-480 MHz)

612A (450 MHz01230 MHz)

AF

Osc.)

Hewlett Packard 400E or equivalent

(I%,

<

0.01% (referred

with scales calibrated in rrns)

to

in

Miscellaneous

1

Resistor, 500

2

Resistors, 10

2

Resistors,

1

$2

0.1

kQ

f

0.1%, 0.25

MQ

*0.1%, 0.25

%,

0.25

W,

precision carbon film

W,

precision carbon film

W,

precision carbon film

Capacitor, 0.47

1

Hexagonal Key, 2.5

1

DISMANTLING

To remove the

Stand the instrument on its rear

a)

Remove the four hexagonal

b)

Carefully lift the instrument out of the case.

c)

PRELIMINARY

)rF

AFM2

(30 V wkg.

mm

(at least 75

from its case proceed as follows:

is

bolts

suitable)

mrn

in length)

panel.

located beside the carrying handles on the front panel.

Prepare the following

Refer to

a)

f

0.1

Prepare an attenuator

b)

REPLACEMENT AND REALIGNMENT PROCEDURE

TUNER printed circuit board

Fig.G4 shows the location of the TUNER and Fig.

1)

assembly.

Fig.Gl and connect two 1

%

resistor in parallel and connect the 0.47

item:

or

shown in Fig.

M2

*O.

G2

T%

from

OF

resistors in series. Connect a 500

pF

capacitor

two

10

kR

THE PRINTED CIRCUIT BOARDS

G5

shows a top view of the TUNER

as

shown.

h

0.1 % resistors.

R

To remove the

2)

(pry

UP).

TUNER

printed circuit rotor, first remove the cover plate of the TUNER

Remove the 7 screws retaining the circular printed rotor. Carefully pull the rotor out

3)

of the fixed contacts and then lift out. Replace the new rotor in the opposite sequence.

Check the orientation of the rotor and take extreme care not to damage the contacts

4)

5)

6)

7)

on the fixed printed circuit board. Before securing the the rotor does not foul the fixed printed circuit

centred and

To remove the fixed TUNER printed

Remove .the

Turn the TUNING knob fully counterclockwise.

Insert a

plate and loosen the set screw in the coupling of the variable capacitor.

Unsolder the care not to heat when

that

the contacts mesh correctly (no overlapping of the contacts).

circuit board, proceed

TUNER

2.5

mrn

10

damage the leods or the cable insulation. Do not use excessive

unsoldering these connections.

printed circuit rotor

hexagonal key through the hole in the bottom chassis support

leads

and

cables soldered to the printed circuit board, taking

as

board.

described in

7

retaining screws, check that

Check that

cis

3)

above.

it

follows:

is

properly

.

8)

9)

10)

11)

12)

13)

Remove the three screws securing the printed circuit board.

Using the blade of a screwdriver support, hold the coupling in place and carefully pull out the printed circuit

inserted

through the hole in the bottom chassis

board.

To replace the printed circuit board, proceed

Again using the blade of a screwdriver inserted through the hole in the bottom chassis support, guide the coupling into position over the variable capacitor shaft and mount the printed circuit

lnsert the three retaining screws, but

Mount the printed circuit rotor as described above in

boad

into place.

do

as

follows:

not tighten them

3).

at

this

point.

14)

15)

Secure the three retaining screws when both the rotor boarcls are orientated correctly.

Rotate the variable capacitor until fully meshed.

and

fixed printed circuit

16)

Tighten the screw in the coupling, using the

2.5

mm hexagonal key.

17)

18)

19)

20)

21)

Proceed to the electrical adiustments as follows:

Set the following controls:

RANGE switch to A

7

TUNING to

IF BANDWIDTH to &400 kHz MAN./AUTO switch to FUNCTION switch to LEVEL

LEVEL potentiometer fully clockwise.

Connect the Sig. Gen.

Set the Sig. Gen. to

Adjust the Sig. Gen. output until a suitable indication on the AFM

is

obtained.

MHz

MAN.

(HP606B)

9

MHz.

to the

RF

INPUT connector of

th

AFM2

METER

of the

22)

23)

24)

25)

'

26)

Using a trimming tool, adjust the oscillator coil for circular printed circuit rotor) for a

METER

is

Reset the Sig. Gen. to 10 MHz.

Reset the

Using a trimming tool, adjust the oscillufor trimming (located next to the oscillator coil for the

Because of interaction between these adiustments, it will

22) to respective TUNING settings without readjustment.

overshoots, turn the

obtained.

TUNING

METER.

25)

inclusive several times until the maximum deflection occurs at the

to 12

LEVEL

MHz.

maximum deflection on the

knob .anticlockwise until a suitable deflection

RANGE

capacitor

A)

for a maximum deflection on

A

(marked on the

METER.

to

RANGE

be

necessary to repeat

If

the

A

27)

Repeat range frequencies, choosing the Sig. Gen. necessary to cover the range in ).ion.

.17)

to 26) on the remaining ranges

B,

C,

D,

E

and

F

at

the appropriate

ques-

IF

FILTER (WIDE) and

IF

AMPLIFIER/IF ATTENUATOR printed circuit boards

These two printed circuit boards are matched at the factory and must a matched pair. No realignment adjustments are necessary.

-

the

IF

28)

29)

30)

.31)

32)

33)

To replace

Remove the cover plate by unscrewing

Unsolder the input and output cables to the printed circuit board, taking extreme care not

Using a fine-blcded angle screwdriver, unscrew the four screws securing the printed circuit boad to the housing.

Lift the printed circuit board out.

Replace in the opposite sequence, again taking extreme care when soldering the input and output cables.

FILTER (WIDE) proceed

to

damage the cables or the nearby componentsF by overheating.

as

thi

four screws

follows:

A

(two shown in Fig.G7).

be

replaced as

4

34)

When IF

board

at

the factory in pairs.

35)

36)

37)

IF

To change out the

C

by

it

can

The printed circuit board may then

when disengaging the multiconnector.

When replacing the board, first make sure that tion and then slide it into the guides.

gaging the multiconnector. Make sure that the board

FILTER (NARROW) printed circuit bod

FILTER (WIDE)

must also

loosening the two screws

be

lifted over the screws.

be

is

replaced, the IF AMP/ATTENUATOR printed circuit

changed out (or vice versa),

IF

AMP/ATTENUATOR

D

shown in

be

board,

Fig.

withdrawn.

Same

resistance will

as

these two boads are matched

first remove the retaining bar

G7

and sliding the bar until

it

Some

is

resistance will

located in the correct ,posi-

be

felt when en-

is

pressed fully in.

be

felt

38)

No recrltgnment

M.

adjustments

are necessary when replacing this printed circuit

-

G6

AM DETECTOR

39)

40)

41)

42)

Connect the DC DVM to the IF

Turn the LEVEL potenttometer counterclockwise.

Adjust pdentiometer R558 (see Fig.G6)

Disconnect the DC DVM.

-I.

IF AMPLIFIER printed circuit

43) Set the FUNCTION switch

44)

45)

46)

Set the METER RANGE switch to

Set the

FILTER/DEEMPHASIS switch to 50 Hz-15

Check that the MAN./AUTO switch

to

LEVEL

LEVEL.

3

and

is

board

@C)

still

jacks.

until

the DC DVM indicates 0

IF BANDWIDTH to

the

kHz.

set

to

MAN.

1

*400

.

V

t2.

kHz.

mV.

47)

Remove the cover of the TUNER

Fig. G5.

48)

49)

50)

Connect the output of the Sig.

to

2

Set the Sig. Gen.

AFM2 deflects to the LEVEL

the

Note the

outpvt level on the Sig. Gen. and then reduce this output by

MHz

k1 kHx

(20 dB).

51)

Set the

MAN./AUTO switch to AUTO.

52) Set the LEVEL potentiometer to 5.

53)

Adjust

to the LEVEL

the

potentiometer R553, shown in Fig,G6. until the METER again deflects

mmk.

(pry

up) and unsolder the cable

Gen, to the cable.

and

adjust

mark.

the output until the METER on

W2,

shown

10

in

times

,

54)

Disconnect the plate.

Set

55)

the MAN./AUTO switch to MAN. and the IF BANDWIDTH to

Sig.

Gen.

and

reconnect the cable

W2.

Replace the TUNER cover

20

kHz.

56)

Connect an oscilloscope to terminals

J500/5

and

J500/6 (0

V).

,..

57)

58)

59)

60)

61)

62)

63)

Connect the Sig. Gen. to the

Set the RANGE to scale

Set the

Adjust the output of the Sig. Gen. until the the

Adjust the oscilloscope and check that the display shows a sine waveform.

Turn the mencement of

Ad just potentiometer

form are symmetrical with respect to the x-axis,

LEVEL

potentiometer to about half way.

mark.

potentiometer clockwise until the display just shows the com-

"flats"

A.

on the peaks of the display.

R514,

RF

INPUT socket and set the frequency to

shown in Fig.

METER

G6,

until the "flats" on the

on the AFM2 deflects to

2

sine

MHz.

wave-

Set

IF

64)

65)

66)

t

67)

68)

Set Sig. Gen. to

output level should

Carefully unsolder the cable

Connect the prepared assembly shown

Connect point Connect point B to tag Connect point C to the centre conductor of cable

Withdraw the short circuit across the capacitor

.

BANDWIDTH to

A

to tag 8 on

AF

AMPLIFIER

12

be

*4400

MHz

about

16

kHz.

with an

30

mV.

W16

J700

on

J800.

1-11

printed circuit board and connect a temporary

C805.

AM

modulation of

from terminal

in

Ftg.G1

(See

J800/16.

cn

Fig.

I

kHz

at

about

(AF

AMPLIFIER

follows:

W16.

H8

for location.) Replace the

30%.

1-11,)

The

board

69)

Withdraw the

Roceed

back into the

AM

as

follows:

AFM.

DET.

printed circuit

board

and refer to Figs.G3

and

H5.

Temporarily disconnect strap A on tag block

TB501.

70)

71)

72)

73)

74)

75)

Tempororfly connect straps C and Replace the

Set FILTER/DEEMPHASIS to

Set METER

Set

MAN./AUTO

Connect the DC

Set

the FUNCTION switch to

METER

the

Set the FUNCTION switch to

METER

RANGE

on

on the

board

the

AFM2

back into circuit.

3

kHz.

switch to 100.

switch to AUTO.

DVM

between the points A and

LEVEL

AFM2

deflects to the

IF

D.

B,

shown

and adjust .the

LEVEL

CHECK and adjust the TUNING knob until the

IF

CHECK mark,

LEVEL

mark.

in

Fig.GI.

potentiometer until

.

76)

77)

78)

79)

80)

81)

Set the shown in Fig.G6,until the ferred to

Connect the

Now connect the attenuator shown in Fig.G2

connecting point D to the centre conductor and point

Connect the AC

Set the MAN./AUTO switch to

the

Now note the voltage indicated on the

as

to

AC

U2,

VTVM

FUNCTION

as

Ul

.

AC

VTVM

indicates the same value as was noted in

mitsh

to

+AM

DC

to the

between points E and F.

and odjurt the trirnmr potentiometer R539,

DVM

AF

OUTPUT

MAN

indicates

and adjust the LEVEL potentiometer until

93.9

connector and note the value obtained.

to the

DC DVM.

This

mV. This value will

AF

OUTWT

F

to the outer screen.

77)

above.

value will

connector,

be

referred

be

rc-

If

83)

U2-U1

R539

is greater than 94.9

untfl the value

indicated

by

a value x (i.e. U2-U1

by

the

DC

DVM

L:

=.93.9 rnV-

94.9

x.

+x),

readjust

84)

Repeat 83) until

U2-U1

r

94.9 mV.

85)

86)

87)

IMlTER printed

L

88)

89)

Disconnect the DC DVM and the

AF OUTPUT socket.

the cable W16 to tag 16 on 5800.

Replace the strap A and disconnect the the AM DETECTOR printed circuit

Disconnect the short circuit across C805 board.

Connect the DC DVM between tags

Using

AC

WVM. Remove the attenuator from the

Unsolder the assembly from J700/8-J800/16 and resolder

strap C and D (shown in Fig.G3) on

krd.

on

the AF AMPLIFIER printed

circuit

a

trimming tool, adjust potentiometer R660, shown. in Fig.G7, until the

'board

15

(0

V)

and 16 on 5600 (LIMITER).

circuit

90)

*

91)

92)

93)

94)

95)

4-1

DC DVM indicates

.Disconnect the

Set

the FUNCTION switch to LEVEL.

Set the

Set

Locate the FM Detector printed circuit

METER

the

IF

the FILTER/bEEMPHASIS switch

DC

RANGE

BANDWIDTH to *400 kHz and the MAN./AUTO switch to MAN.

0 V- dc 10.5%.

DVM.

switch to 3.

to

50

Hz

-

15

kHz

and the RANGE to

board and unsolder the centre conductor

A.

of cable W9

96)

Solder the assembly shown in Fig. point

at

B

to tag 8 of

tag

5

on

S700.

5700.

GI,

as

follows: Point A to tag' 5 of

Point C on the assembly

is

not used in this check.

JN)O

and

97)

Connect the

DC

DVM

between tag 8 of

.I700

and point H of the assembly.

98)

99)

100) Reset the FUNCTION to

101)

102)

Connect the

Set FUNCTION to IF

TER

indicates the IF CHECK mark. Reset FUNCTION to

LEVEL

Using a trimming tool,

the

Disconnect the DC of cable

pot. until the

DC

Sig. Gen. to the RF

METER

DVM

indicates 955 mV.

DVM

W9.

CHECK

INPUT

and

tune the

indicates the level mark.

and mt the

AFM

(about

frequency

8

MHz)

LEVEL

to

i0

MHz.

until the

and diust the

ME-

-FM.

djust the potentiometer R708, shown in Fig.G6, until

and

resistance assembly. Reconnect the inner conductor

IF

CHECK realignment adiustments

103)

104) Set the

105)

106)

107) Reset the FUNCTION switch to IF CHECK.

108) Using a trimming tool, adjust the potentiometer

Set the Sig. Gen. to

LEVEL

Set

the FUNCTION switch to

Adjust the output level of the Sig. Gen. until the mark on the scale.

the

METER

potentiometer to position 10.

deflects to the IF

2

MHz.

LEVEL.

CHECK

mark.

METER

R737, shown in Fig.G7, until

deflects to the

LEVEL

109)

1

10)

Vary the the deflection on the mark,

Disconnect the

t

10

2

MHz

kHz.

setting of the Sig. Gen. by + and

Sig.

METER

en.

corresponds to + and

-

200

kHz

and

check that

kHz

from the IF CHECK

AF AMPLIFIER

1-11

prlnted circuit board

--

11

112)

113)

114)

115) Connect the

116)

-

117)

118)

Withdraw the AF AMPLIFIER Ill-V printed circvit board.

1)

Unsolder the centre conductor of cable W15 from tag 15 of

Set

the FILTER/DEEMPHASIS to 6 dB/oct.

Set the METER RANGE to

Using

the

DC

Replace the AF AMPLIFIER Ill-V printed circuit board, and resolder

Adjust the AF AMPLIFIER Ill-V printed circuit board

J800.

3.

DC

DVM between the tags 2 and

a

trimming tool, adjust the potentiometer R803, shown in Fig.G6, until

DVM indicates 0 V * 10 mV.

3

(0

V) of

5800.

4

W15

as

set out in 120) to 131)

in place,

below.

119)

AF AMPLIFIER Ill-V minted circuit board

120)

121)

122)

123)

124)

Adjust the AF DETECTOR printed circuit board as

Set

FUNCTION

Set

METER

a

Using METER on the AFM2 indicates zero.

Set the METER RANGE to 30.

Set the

trimming tool, adjust potentiometer R929, shown in Fig.G6, until the

FILTER/bEEMPHASIS switch to 200

to +AM.

RANGE to 100.

kHz.

set

out

in

132) to

134)

below.

125)

126) Connect the AC DVM between tags 15 and

Connect the AF Osc. between the frequency to 1

kHz.

tags 4 and

6

(0

18

V)

on 5700

(0

V) dn J8004(AF

(FM

DET.) and set

AM

1-11).

127)

Adjust the output of the AF Qsc. until the AC DVM indicates 20

mV rms.

128)

129)

130)

131)

AF DETECTOR printed circuit

132)

133)

Disconnect the AC DVM and reconnect it to the AF OUTPUT connector.

Using a trimming tool,

'AC DVM indicates 0.672 V (rrns value).

Using a trimming tool, the

METER

Disconnect the AF Osc. and the

Set the FUNCTION switch to

Set the

on

the

METER

RANGE

AFM2

ad

just potentiometer R909, shown in Fig.

adjust the potentiometer R923, shown in Fig.G4, until

indicates 30.

AC

DVM.

boad

G4,

until the

-AM.

to 100.

134)

POWER

135)

RF

136) No realignment

Using a trimming tool,

METER

SUPPLY printed circuit

No realignment is necessary after replacing the POWER SUPPLY printed circuit

board.

ATTENUATOR printed circuit

board.

on the

AFM

is

ad

just potentiometer R1002, shown in Fig.G7, until the

indicates zero.

board

necessary after replacing the

RF

ATTENUATOR printed circuit

137)

138)

139)

To replace

Remove the TUNER cover plate

Remove the cover of the

the

RF

ATTENUATOR printed circuit board, proceed

(pry

up).

ottenuator

by

unscrewing the two securlng screws.

as

follows:

140)

at

Unsolder the input cable

the connector. (To give further access to the attenuator and the RF INPUT con-

the RF

INPUT

connector and loosen the nut securing

141)

142)

METER

nector, moved by unscrewing its side frame and

Unsolder the cable from the attenuator inside the TUNER

the screening tube between the

Remove the screw located to the right-hand side of the attenuator pushbuttons

and

Note:

-

check that the pushbuttons do not foul the front panel.

it

is recommended that the left-hand side frame of the chassis be re-

6

mounting screws,

2

on the rear frame.)

TUNER

lift

the attenuator assembly out of the chassis.

When replacing the attenuator assembly, secure the screws carefully and

2

on the front panel,

and the attenuator.

2

and withdraw

4

on the

it

from

If

143)

144) With. models of serial numbers above

REPLACEMENT OF

Refer to Figs.

Two cords are used, a long and a short. The long cord couples the cursor to the drive

wheel. The short cord couples the

the meter has been changed out,

printed circuits in models with serial numbers up to 173610:

AF AMPLIFIER

AF

AMPLIFIER Ill-V

AF

DETECTOR

after replacement of the meter.

G8

1-11

THE

SCALE CORDS

and

G9.

TUNING

it

will

be

necessary to realign the following

this,

no realignment adjustment is necessary

knob shaft to the drive wheel.

To facilitate replacement, remove first the scale drum. This

screws at each side of the scale window. Take care not to scratch the window, which

is

retained in place by the screws securing the scale drum. After replacement of the

is

done by unscrewing the

'

cords, remount the scale drum

that

Check

the scale exposed in the window corresponds

and

window, taking care not to scratch the window.

to

the

RANGE

settlng.

Ustng a hexegonal key, loosen the Turn tho that the capacitor in wer the llttle trimmtng miark to the left of the scale and tighten the screws securing the

TUNING

drive wheel.

knob until the cursor

the

TUNER

two

screws securing the drive wheel to the shaft.

is

in its extreme left-hand position. Check

is

fully meshed. Set the reference line

on

the cursor

ca.30

mm

1

MR

500

R

1

ca.

c--

MR

10

-

mm

0.47

ca.50

ca. 30

mm

-

C

pF

B

mrn-

D

-

ca.

30

mrn

*

all resistors to

Fig.

GI

.

10

kR

'

7

Fig.

E

G2.

10

ca.

kR

'*

10

mm

resistors to

ca. 30

mm-m

be

AO.

1

F

~0.1%

%

strap

Fig.

A

G3.

AM

Detector

IF

Output

printed

+

Amp.

cct. board

POWER

SUPPLY

G

16

AF DET. AFAMI? FMDET.

Ill

-v

/

IF

FILTER

<

(NARROW)

Fig.

G5.

Fig.

G6.

Power

pup

P~Y

\scale

dru~n

Fig.

G7.

-long

cord

4

Short

cord

spring

Fig.

G9.

HI.

Section

In the following parts

this code, a list of the different types of parts and their corresponding group code pre-

is

fix

Standard resistors 100- to Precision resistors 140- to 152Non-l inear resistors

UHF

Carbon potentiometers Wire-wound potentiometers Mica capacitors

Ceramic capacitors

Paper capacitors

listed belowr

resistors

list

a group code prefix nuniber

16&

H.

Parts

139-

List

is

used. To facilitate the use of

Meta I-paper capacitors Plastic capacitors Electrolytic capacitors

Variable capacitors

Special tubes

Rectifiers

Diodes

Transistors Integrated circuits Lamps, batteries, fuses Switches Coils, coil material and transformers

As

we are continually improving our instruments, it

you

parts, that

include the following information*

400- to

500-

to

700-

486-

580-

to

785-

is

important, when ordering spare

The code number and description of 'the part The circuit reference from the wiring diagram The complete type designation of your instrument The serial number of your instrument.

Please note that the position of any part can easily be found by referring to the last column of the parts

list.

This

indicates on which figure the part can be located.

MAIN PARTS

LIST

CAPACITORS

Designation Type Value Accuracy and

C1

C2

C3

C4

C5

electrol ytic

polystyrene 50 nF 1% 63 pol ystrene polystyrene 407 polystyene 3 nF

2.2

1

nF

!IF

pF

'

max. voltage

100

V

2%

63

V

1% 63

2%

63

V V

LAMPS

Designation Type

I

neon lamp, yellow,

110

V

TERMINALS

Code No.

Designation Type

coaxial bushing coaxial' bushing UG-657/U coaxial bushing. phone jack, non-insulated phone jack, red phone jack, black phone jack, red phone phone iack, red phone 3-pole socket terminal strip, 20 pole terminal strip, 15-pole

UG-657/U

UH

iack, black

F-83G

Code No.

B.73

terminal strip, 26-pole terminal strip, 16-pole

J700

termfnal strip, 15-pole

J800A

J800B

3900

JlOOO

J1200 terminal strip, 13-pole

Designation , Type

terminal strip, 1Olgole terminal strtp, 5-pole

terminal strip, 20-pole termfnal

ferroxcube tube, 15 ferroxcube tube, 15

ferroxcube tube, 15 mm ferroxcube tube, 15 ferroxcube tube, 15 mm ferroxcube tube, 15

strip,

15-pole

mm

Code

No.

ferroxcube tube, 15 ferroxcube tube, 15 mm

Designation

meter with scale, 450

Designation Type Value

R

1

R2 R3

Type

pA

tandem potm.

wire-wound 110

metal film 4.95

mm

METERS

RESISTORS

A:

250

B:

500 R lin.

n

kR

2%

kR

pa.

exp,

crt

25'~

0.2% 1/4

W

10%

Code No.

482-

1

54

Code

No.

R4 R5 R6

metal metal film 1 metal film 3.16

film

550n

kQ

0.2%

kR

114

w

1/4

W

0.2% 1/4

W

metal film

carbon film carbon film metal film metal film metal film

Designation

metal metal film metal film metal film metal film metal film metal film metal film metal film

Type

film

SWITCHES

Code No.

s

1

S2

S3

S4

x

S5

x

S6

x

57

S8

xS1300

X

indicate? special parts manufactured by Radiometer.

slide switch slide switch slide switch slide switch switch, switch, "FUNCTION" switch, "DEEMPHASIS"

POWER

switch,

"RANGE"

switch, 2-pole

"RF l NPUT

Attenuator"

Q,

a

X

...............................

.

0000000

~~000000~0000000000DU00000~

~~8uuuuouou8~0000~Q00QQQQou

XXXXXXXXXX XXXXXXXXXXXXXXXXXxX

0

0-

V

9999999999999999999999999999999

3

88880000000000080000000080000

~~~oooooo88oo88ooSooo888886888

111

.

CO00COCO0000 CO

000000000 0 0

.

o~oooo.ooo~ooooooooo~~~~~~~~

1

. .

.o

.

2

.O

.o

.E

..o

.o

.

.o

.

.o

.o,

d

0

m

0

rr)

C3

E

ddddddddddd

00 00

CO 00COCO

1111111111

oooooooo

.

.o

. .2 .

.o

.I!

.O

.o .o

.D

d

o

III

o o

MISCELLANEOUS

Designation

Type

pointer knob pointer knob with wing

x

knob

x

cap for knob

x

cap for knob

x

cap for knob

x

rubber foot

x

scale

x

scale

x

scale

x

scale

x

scale

knob

N30

N40,

A

B

C

D

E

N20

with .crank knob

N14/2A N14/2B N16/2A

Code . No.

x

scale

,

x

scale

x

sprocket drive chain

x

sprocket wheel

x

sprocket wheel

x

sprocket wheel

scale cords

x

pinion

x

pinion

x

pinion

x

pinion

x

pawl pinion

x

pawl pinion

x

bevel pinion

F

G

\

x

indicates special parts mc~nufactured

by

Radiometer.

PRINT

.

RF

BOARD

ATTENUATOR,

I

'-

TUNER,

CODE 970-188_

CAPACITORS

CODE

970-149/970-151

-

Designotion

ClOl

C102 C1@

C104 C105

xC106

C107 C108

L

,

C109 CllO

Clll C112 C113

Type

electrolytic tantal um

ceramic ceramic

ceramic variable ceramic trimmer

ceramic trimmer

ceramic trimmer ceramic

Value

250

pF

10

pF

47

pF

4,7

nF

4-7

nF

2.2

nF

0.5 - 3

1

nF

0.5

-

3

1

nF

0.5

-

3

470

pF

Accuracy and max. voltage Fig.

25

V

15

V

&20% 25 V 21 3-01

-

20/+80% 40 V 213-010

-

20/+80% 40

V

-20/+80%25V ,213-012

-20/+80%

-

20/+800/0 25

25

V

Code

260-042

267-000

213-010 285-5 1 3

286-206 213-013

286-206 213-013 286-206 2 13-0 14

No.

9

Shown in

L

C114. C115

C116

Designation

trimmer ceramic

trimmer ceramic trimmer ceramic ceramic

ceramic

tantalum ceramic ceramic cemmic

Type

diode

HP5082-2812

0.5 - 3 220

pf

0.5 - 3

47

pF

0.5 - 3

47

pF

2.2

pF

1.5

pF

10

pF

1

pF,

1

PF

1

PF

DIODES

(matched)

pF

-2O/t800/a 25

+2%

%0.5 k0.25

100

pF

V

v

NPO

-20 + 50% 15/18 +0.25 i0.25 t0.25

pF pF pF

V

286-206 213-018

286-206

Code

No.

i

indicates special parts manufactured by Radiometer.

diode

HP5082-2812

(matched)

CR103 diode 5082-281 2 (matched)

CRI

04

diode 5082-281 2 (matched)

FILTERS

Designation Type

FLlOl filter

'B

8513-A-C1

FL102 filter B 8513-A-C1

Designation Type

LlOl choke, 47 L102 choke, 47

xL103

oscillator coil

pH pH

oscillator coil oscillator coil oscillator coil osci

l

lator coil

Code No.

INDUCTORS

Code No.

Designation

QlOl QlO2

l

lator coil

osci ferrite tube, 15

mm

ferrite tube, 1.2/3.5 x 3.2 ferrite tube, ferrite tube, choke, 47

1.2/3.5x

1.2/3.5

pH

ferrite tube, 7

ferrite tube, ferrite tube,

mm

1.2/3.5 x 3.2

1.2/3.5

w

x

3.2

TRANSISTORS

Type

transfstor transistor

2

N3906

BC149

Code

No.

4104

X

.indicates special

tramfstor

parts

BC147

mnufactud

by

Radiometer.

RESISTORS

Designation

RlOl

R102

R103

R104

R105

R

106 R107 R

108 R109

RllO

Rlll

R112 R113

carbon film carbon film carbon film carbon film carbon film carbon film

carbon carbon film carbon

carbon carbon film

metal film

#film

,film

fil'in

Value

Code

No. Shown in

106-310

106-247

106-4 10 106-456 106-310

1

06- 247

104-4

10

1

06-468

106-433

106-310 106-AlO 140-355 140-355

Fig.

R114 R115 R1300 R1301

R

1

302 R1303 R1304 R1305 R1306 R1307 R1308

R

1309

R1310

R1311 R1312

carbon film carbon film

metal film

metal film metal film metal film

metal film

metal film metal film metal film metal film

metal film metal film metal film

106422 106-51 0 140428 H-1

R1313

R13 14

'

metal film metal film

HI0

TRANSFORMERS

Designatibn

x

TlOl

x

TI02

x

TI03

X

indicates special

-

Designation

'

Type

transformer transformer transformer

parts

PRINT

polystyrene polystyrene polystyrene

manufactured by Rodiometer.

BOARD

It - IF

FILTER (WIDE), CODE

CAPACITORS

Value

Accuracy and

max.

voltage

900-241

Code

No.

5029-A4 5 1 65-A4

1085A4

Code No.

.,

Shown in Fig.

C208 C209 C2 10 C211 C212

C2 13

'

Designation Type

polystyrene polystyrene po

I

yst yre ne polystyrene polystyrene polystyrene polystyrene

polystyrene polyst yrene polystyrene

174

pF

1715

pF

1295

pF

1856

pF

189

pF

407

pF

INDUCTORS

1%

63

l%63 1%63 1%63 1%63 1% 63

V

V V

V

243- 1 12

H2

243- 102 H2 243- 1 00 H2 243- 103 H2 243- 1 14 H2 243- 116

Code No.

H2

Shown in Fig.

xL201

x

L202

x

L203

x

L204

x

L205

x

L206

x

L207

X

:,J?,,r,,

,-al:rl

choke, choke, choke, choke, choke, choke,

choke,

M-+C

1.05 pH

10.15 pH

3.86 pH

6.69 pH

3.86 pH

3.09 pH

15.12 pH

mmnm

lCmch

nrarl

hv

Rnrltnmntrar

PRINT

BOARD

Ill

-

IF

AMP

CAPACITORS

+

ATTENUATOR,

CODE

900-242

Designation Type

.polyester

ceramic ceramic ceramic ceramic trimmer ceramic ceramic ceramic ceramic ceramic

,

L

C3 13

C3

14

C3 15

ceramic ceramic

ceramic

Value Accuracy and

max. voltage

22

nF

3.3

22 nF

pF

-20/+8Q% 40

,

*0.5

-

pF

20/+80% 40

V

Code

213-01 210-133 H3

213-01

No.

1

Shown in, Fig.

H3

.

\.

C3

16

C3

17

C3 18

ceramic ceramic

ceramic ceramic ceramic ceramic ceramic ceramic ceramic. ceramic polyester ceramic

ceramic

0.1 10

22

pF

nF

-20/+80% 12

*

5%

V

213-017 H3 210-210 H3

-20/+80% 40 V 213-01

-20/+50% 40

-

20/+80% 40 V

V

-20/+80% 40 V

-20/+80% 12

V

5%

-20/+80% 30

-20/+80% 12 10% 160

-20/+80% 40

5%

selected

V V

V

1

H3

DIODES

Designation Type

CR30

1 CR302 CR303 CR304

Designation

'

P300

Designation Type

diode diode diode

diode

BAY74 BAY74 BAY74 BAY74

Type

terminal strip,

TERMINALS

20

pole

TRANSISTORS

Code

No. Shown in

Fig.

No.

Shown in

Fig.

Shown

Fig.

in

.

Q30

1

Q302 Q303

(2304

Q305 Q306 Q307

4308 Q309 Q310

Q311

transistor transistor transistor

transistor

transistor transistor transistor transistor transistor transistor transistor

BFY90

2N3904

2N3906

BFY90

2N3906 2N3904 2N3906

BC149

2N3906

BC

149

RESISTORS

Deslgnatiom

Type Value

carbon film, factory-selected metal film carbon film carbon him carbon potm carbon film carbon film carbon film

carbon film carbon film

carbon film carbon film carbon film

45.7R 0.5% 1/4 47

R

5%

390 R 5% 0.3

1

kQ, lin.

680 R 5%0.3

100 R 12 R 5%0.3

5%

0.3

W

W W

W

Code

No.

Shown in

Fig.

carbon film

carbon film carbon film carbon film

carbon film

1.5 kR'5% 0.3

3.9

kR 5% 0,3 22 0 5% 0.3 270 R 5% 6.3

150 R 5% 0.3

82

R 5% 0.3

2.2

kR

5%

0.3

100

R

5%

0.3

3.3

kR

5% 0.3

8.2

kR

5%

0.3

100 R 5% 0.3 100

R

5%

0.3

W W

W

W W

W

carbon film

2.2 kR 5% 0.3

W

carbon film

cqrbon film carbon film carbon film carbon film carbon film carbon film carbon film

carbon film

R339 R340 R34

1 R342 R343

R344

R345

Designation

WOO

carbon carbon film carbon film carbon film carbon film carbon film

carbon film corbon

Type

coaxial cable,

film

potm.

68

R

100 R 5% 0.3

1.5kR

3.3

1.5

68

470

CABLES

50

R,

RG196/U,

5%0.3

kR

5%

kR

5%

R

5%

R,

0.3

lin.

W

0.3

0.15

W

m

Code

No. Shown in

Fig.

PRINT BOARD IV - IF FILTER (NARROW), CODE 900-243

Designation

polystyrene polystyrene polystyrene polystyrene ceramic

polystyrene

polystyrene polystyrene polystyrene polystyrene polystyrene

CAPACITORS Value

..

Accuracy and

max.

voltage

Code

No,

Shown Fig.

in

\.

\

k

I

L.

<

L

ceramic ceramic

Designation Type

C R40

1

diode BAX16

Designation Type

x

L40 1 L402 inductor,

inductor, 5.82

6.95

L403 inductor, 0.53

x

L404 inductor,

x

L405 inductor, 0.53

0.53

pH

DIODES

INDUCTORS

Code

No.

Code No.

4575-A4

Shown

in

Fig.

..Shown in

Fig.

H4

x

L

L406 inductor, 1.22

indicates special parts manufactured by Radiometer.

\

pH

TERMINALS

Designation

terminal strip,

Type

transistor transistor 2N3904 transistor 2N3904

2N1711

15

pole

TRANSISTORS

RESISTORS

Value

Code No.

Code No. Shown in

Sh~wn in Fig.

Fig.

metal film metal film metal film carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film metal film

CABLES

Designation

W400

coaxial cable

SO

f2,

RG196/U

Code No.

Shown in Fig.

PRINT

BOARD

V

-

AM

DETECTOR

CAPACITORS

.I

IF

OUTPUT

AMP,

CODE 900-244

Designation

polystyrene

ceramic

polystyrene

ceramic

polystyrene

ceramic

tantalum

ceramic

cerornic

ceramic ceramic

Value Accuracy and

max. voltage

Code

No.

Shown in Fig.

L

I

1

!

i

1

.C517

C518 C519 C520 C52

1 C522 C523

C524 C525

C526 C527

tantalum tantal um polystyrene ceramic ceromic ceramic ceramic ceramic ceramic

polystyrene

ceramic ceramic polystyrene

100 pF 5% 125

4.7

82

22

0.1

2.2

300

0.1

0.1 300

nF pF nF nF

pF

nF

pF

pF pF pF

-20/+50% 40 V

5%

-20/+80% 40

-20/+80% 12

-20/+80% 25 V 2'13-012 H5 10% 63

-20/+80%

-20/+80% 12 10% 63

V

243-037 H5 213-010 H5 2 10-282 H5

V

1

2

V 213-017 H5

V

213-01 213-01 213-017 H5

243- 1 08

213-017 H5

243- 108 H5

1

H5

C528 polyester 10

C

529 tantalum

20

pF

pF,

10% 63

6

V

C530

C53

1

tantal urn polystyrene

Designation Type

CR501 CR502

zener diode

diode 1 N916

CR503 diode 1 N916 C

R504 CR505 CR506

Designation

zener diode BZY88CN5 diode H D5004 diode HD5004

Type

68 2433

DIODES

BZY88C9V

INDUCTORS

1

pF

nF

16

1%

V

63

V

Code No, Shown

Fig.

in

Code No. Shown in

Fig.

L50

1

L502 choke, L503

choke,

RF

47

pH

47

pH

miniature choke, 10 pH

TERMINALS

Designation Type

P500 terminal strip, 20-pole

TRANSISTORS

Designation Type

Q50 1 transistor 2 N3904 Q502 transistor 2N3906

Q503 transistor 2N3904

Code No, Shown

Fig.

Code

No.

Shown Fig.

in

Q504

transistor 2N3W

QS5 transistor

QSO6

Q507

Q508 transistor

(2509

(3510

Q5ll Q512

Q514

Q515

Designation

transistor 2N3906 transistor 2N3W

transistor 2N3906 transistor 2N3904 fransistor transistor TD transistor 2N5087 transistor

Type

2N;(3W

2N3906

12

1,

,.

BC149

RESISTORS

Value

Code

No.

Shown in

Fig.

carbon film

carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film

carbon film

carbon film carbon film carbon pot.

carbon film

carbon

film

carbon carbon carbon carbon carbon carbon carbon carbon carbon

carbon carbon carbon carbon carbon carbon

film film film film film

film

film film film film

film

carbon carbon carbon metal

carbon carbon carbon

carbon

carbon carbon carbon carbon carbon carbon carbon

film film film

film

potm. film

film

film film film film film film film

film

10 kR,

5.6

kR

1.2

kC2

lin.

5%

0.3

W

carbon

carbon carbon carbon

film film film

potm, film film

100

3.3

12

1

kR,

1.8

8.2

kR

kn

kQ

kR

5%

0.3

5%

0.3'~

lin.

5%

5%0.3

0.3

W

w

W

carbon carbon carbon

metal film

carbon

metal film

metal

carbon film

metal film

Designation Type

TB501

tag strip, +pole

film film

potm.

film

82 kR

TAG

STRIPS

5%

0.3

W

Code

No.

Shown

Fig.

in

PRINT

BOARD

VI

-

LIMITER,

CAPACITORS

CODE

900-245

Designation

C608

ceramic

polystyrene tantalum tantalum ceramic

ceramic ceramic

tantalum

polystyrene ceramic

ceramic

Value

10

pF

Accuracy and

max.

15

voltage

V

Code

No.

Shown

Fig.

267-000 H6

in

C620

1

C62 C622 C623 C624 (2625 C626

cerpmic ceramic ceramic ceramic

ceramic ceramic ceramic

tantal um ceramic

tantalum ceramic

22

10

470

10

47

10

22

nF

pF

nF

pF

nF

-20/+80% 15

V

-20/+80%

15

V

-20/+80%

15

V

40

25

30

-20/+80% 40

V

213-01

1

H6

267-000 H6

V 213-014 H6

267-00 H6

V

213-016 H6 267-000 H6

V

2 13-01

1

H6

C627

tantalum

10

pF

C628 tantalum

C630

C63

1

Designation

CR60

1

CR602

ceramic tantalum

Type

diode

diode diode BAX16 diode BAX16

diode

Zener diode

diode

BAVI BAVI

BAVIO BAVI

BAVlO

0

1

N3497

10

pF'

2.2

nF

10

pF

DIODES

Code No.

Shown in

Fig.

diode

Designation Type

P600

P60l terminal strip

Designation Type

terminal strip,

transistor transistor 2N3906 transistor

BAVlO BAVlO BAVlO

2N3906

BC149

TERM1

10

pole

TRANSISTORS

NALS

Code

No,

No.

Shown in

Fig.

Shown in

Fig.

transistor transistor BC149 transistor transistor 2N3906 transistor 2N3906

BC149

transistor

2N3906

Designation

transistor transistor transistor transistor transistor transistor BC149

transistor transistor BC149 transistor transistor transistor

2N3906 2N3906 2N3906 2N3906 2N3904

T

D

100

2N3906 2N3906 2N3906

RESISTORS

Value

Code

No.,

Shown

Fig.

in

carbon

carbon film

carbon carbon film carbon film carbon carbon film

carbon film carbon film carbon film carbon film carbon carbon film

carbon film carbon film

film

potm.

330

R

5%

0.3

470 Q 5%0,3

330

R

5%

0.3

150

R

5%

0.3

3.9

kR

5%

0.3

1.8

kS2

5%0.3 180 R 5%0.3 18 R 5% 0.3

33

kR

5% 0.3

56

kR

5%.0,3

56

kR

5%0.3

10

kn,

lin.

8.2

kR

5%

0.3

3.3

kR

5% 0.3

27

kR

W

W W

W

carbon film carbon film

5.6

68

kR

carbon

carbon carbon carbon carbon

film film film film

film

68

10 10

kS2

1

kR

6.8

kR

5%

kR

5% 0.3 W

kR

5%

5% 0.3

5%

kR

5%0.3

0.3

0.3 W

0.3

W

carbon carbon carbon carbon carbon carbon carbon carbon

carbon carbon carbon carbon carbon

carbon carbon

potm. film film film film film film film

film

potm.

film film film film film

1

kR,

lin.

560

R

5% 0.3

2.2

kR

5% 0.3

1.5

kR

5%

390

R

5%

47

R

5% 0.3

1

kR

5%

1.8

kR

5%0.3

560

D 5%

kR,

lin.

6.8

kR

5%0.3

2.2

kQ

5% 0.3

1.5

kR

5% 0.3

390 R 5%

47

R

5% 0.3

0.3

W

W W

W

carbon carbon carbon carbon carbon

carbon carbon carbon carbon carbon carbon carbon

film

film film film film film

film

film film film film

1

kR

5% 0.3

W

1.8kR 5%0.3W

12

kR

5% 0.3

1

kR

5%

47

R 5% 0.3 W

kR

5% 0.3 W

1

68

R

5%

10

kQ

5% 0.3

10 R 5% 0.3

0.3

W

10 R 5% 0.3.W

6.8

kR

5%

0.3

6.8

kR

5% 0.3

W

carbon film

6.8

kQ

5% 0.3

W

carbon film carbon film carbon film carbon film carbon film carbon film carbon film wire-wound trimmer wire-wound carbon film carbon film

carbon

carbon film wire-wound

film

100 kR 5%

4.7

kQ

5%

0.3

W

1.5kR 5%0.3W 680 R 5% 0.3

1.8

kR

5% 0.3 W

27

kR

5%0.3

18 kR 5% 0.3

W

4.18 kR 1% ZZ

kR

10%

1%

5%

5% 0.3

5%

0.3

W

500

2.46

6.8

100 kR

4.7

47

10 kR 0.1%

Designation

W600

wire-wound

carbon

metal film carbon film carbon film

carbon film carbon

coaxial cable,

pot.

film

10

221

10R 5%0.3

560 R 5%0.3

22

560

CABLES

50 SI,

R196/U,

kR 0.1%

kR,

lin.

kR

1% 0.1

R 5%

R

0.3

5%

0.3

0.14

W

Code No. Shown in

Fig.

m

indicates special parts manufactured

by

Radiometer.

PRINT

BOARD

VII

-

FM

DETECTOR, CODE

900-246

Designation

C704 C705 C706

ceramic ceramic ceramic ceramic ceramic tantalum tantalum ceramic tantalum polystyrene polystyrene electrolytic polyester

Value Accuracy and

max. voltage Fig.

39

47

47 47

10

pF

nF

pF

5%

-20/+80% 30 V 213-016

-20/+80% 30 V

-20/+80% I5

V

30

V

Cade

21

No.

1-239

3-016

213-016 267-000

Shown in

H7

H7 H7

H7

\.

i

.

!

I

4

I

i

polyester

C715

Designation Type

CR70

1

CR702 CR703

CWO4

CR705 CR706

polystyrene

zener diode zener diode diode

diode

BZY88C3V3

BZY88C3V6 5082-281 5082-2 5082-2

8

BAXl6

1

1 1

4.7

nF

DIODES

5% 63

V

'

243-021

Code

No.

H7

Shown in

Fig.

H28

RELAYS

Designation

K700

~esi~nation

x L701 xL702,

L703

Designation

Type

gas relay

Type

choke, choke, choke,

47

Type

203 394

pH

IN

DUCT

ORS

TERMINALS

Code

Code No.

Code No. Shown in

No.

Showsl in Fig.

Shown in Fig.

Fig.

P700

Designation

terminal strip,

transistor transistor transistor transistor transistor transistor transistor transistor

transistor

2N3W

2N3904

2

N3904

2N3251

2N325

2N3906

BC149

TD100

21

pole

TRANSISTORS

Code No. Shown in

Fig.

1

indicates special parts manufactured

transistor transistor

2N3906

BC149

by

Radiometer,

RESISTORS

Designation

W01 R702

W03 R704 R705 R706 R707 R708

R709

R710 R711 R712

Type

carbon film carbon film

metal film

carbon film

metal film carbon film metal film trimmer

wire-wound

carbon film carbon film carbon film carbon film

potm.

Value

Code No.

Shawn in

Fig.

R713 R714

R715

R7 16

R717

R718

R7

19

R720

R72

R722

R723

R724

R725

R726

R727

1

metal film carbon film carbon film carbon film

metal filrn

metal carbon film carbon film carbon film

carbon film carbon film

carbon film

filrn

R728 R729

carbon film

R730

R73

1

carbon film carbon film

82

1.8

kR

5%

0.3

W

106-582 106-418

H7 H7

R732 W33

R734

R735

R736 R737

R738

R739

R740

R74

1

Designation

W701

carbon film carbon film metal film metal

metal

cermet carbon film cermet potm. metal film

carbon film

Type

coaxial cable,

film

potm.

50

3.3

68

kR

2.25 822

7.5

1

kR

2.7

2.2

57.6

3.3

CABLES

$2,

RG196/U,

kR

R

kR

kR,

I&,

5%

1%

5%

0.3

1/4

1%

5%

W

l/4

W

1/4

0.3

0.10

W

1/8

W

m

106-433 106-568 140-380

140-379

1401.2

99

Code No, Shown in

H7 H7

H7

Fig.

PRINT

BOARD

Vlll

-

AF

AMPLIFIER

CAPACITORS

I

+

11,

CODE

900-247

Designation Type

polystyrene polystyrene polystyrene

ystyene

pol electrolytic polystyrene ceramic polystyrene

ceramic tantalum ceramic

C812

C8

13

polystyrene ceramic

Value Accuracy and Code No. Shown in

54.5

82

pF

nF

max.

l%63

5%

voltage Fig.

V

DIODES

Designation Type

CR80

1

CR802

CR803

Designation

I

t

(

i

x

L801

x

L802,

x

L803

indicates special parts manufactured

diode

zener diode zener diode

Type

choke,

BAV10

400 400

400

BZY88C6V8 BZY88C6V8

INDUCTORS

pH

by

Radiometer.

Code No. Shown in

Fig.

Code No. Shown in

Fig.

choke,

400

pH

choke,

Designation Type

P800

Designation Type

Q80

1

Q802 Q803 Q804

terminal strip,

transistor transistor transistor

transistor TDl

1

10

pH

TD121

BC149

2N3906

21

TERMINALS

20-pole

TRANSISTORS

Code

Code No. Shown in

No. Shown in

Fig.

Q805 Q806

.

transistor transistor

BC 149 BC149

RESISTORS

Designation Type Value

metal film carbon film carbon potm

carbon film

metal film carbon film carbon film carbon film

.

550

i2

680 R 5% 0.3 100

3.9

MR

3.16kQ

.47

kR

22

kS2

330 R 5% 0.3

0.2%

kR,

5%

lin.

5%

1%

0.3

1/8

W

1/2

W

1/4W

W W

W

Code No. Shown in

Fig.

indicates special parts manufactured by Radiometer.

carbon film

carbon film carbon film

1

4.7

kS2

kR

5% 0.3 5%0.3

5%

0.3

W

.:

carbon

carbon carbon

film film

film

film film

180 R 5%

82

R

5%

2.2

kR

5%

560

R

5%

1

kR

5%

0.3

W

0.3

W

carbon

carbon carbon carbon carbon

metal carbon metal

metal

film

film film film film

film

strap

39kR 5%0.3

56

k8

5%

0.3

6.8

kR

5%

0.3

12

kR

5%

0.3

470 R 5%

6.8

kR

500

R

5.6

kR

12.6

ca.

0

5%

1% 1/4

5%

kR

R

0.3

0.5%

W

1/4

W

PRINT

BOARD IX

'-

AF'AMPLIFIER

CAPACITORS

Ill

-

V,

CODE

900-248

Designation Type

polystyene

polystyrene

polystyrene selected

tantalum electrolytic ceramic polystyrene tantalum tantalum polyester

1

yester

po

ceramic

Value Accuracy and Code

max. voltage

No.

Shown in

Fig.

ceramic ceramic tantal um

tantalum

Designation Type

CR90

1

CR902

C

R903 diode 1 N916

CR90.Q

diode BAX16 zener diode BZY88C6V2

diode IN916

DIODES

Code No. Shown in

Fig.

H35

INDUCTORS

Designation

x ~901 choke, 197 xL902 choke, 394 xL903 choke, 203

Designation Type

P900 terminal strip, 20

Designation Type

Type

pH

TERMINALS

pole

TRANSISTORS

Code No. Shown in

Fig.

Code

No.

Shown in Fig.

transistor transistor 2N3906

'transistor BC149

transistor BC149 transistor BC149 transistor 2N3906 transistor BC149 transistor BC149 transistor BC149

transistor, BC149

transistor 2N3906 transistor BC149

BC149

RESISTORS

Designation

R901 metal film 500

indicates special parts manufactured by Radiometer.

Type

Value

Q

1%

1/4

W

Code No.

140-397

Shown in Fig.

carbon film

carbon film carbon film carbon film carbon film carbon film metal film carbon potm. carbon film carbon film carbon film

carbon film carbon film carbon film carbon film

500

27

kR

S2,

5% 0.3

Iin.

W

carbon film carbon film

metal film metal film

metal film carbon film carbon potm.

metal film

carbon film, sel ec ted

carbon film carbon film

carbon film

carbon potm.

carbon film

10

kR,

lin.

approx.

470 kR

120 kR

5.6

0.5

5.6

5%

MR

5% 1/2 W

MR,

0.3

lin.

680 R 5% 0.3

kR

W

0.3

W

carbon film

carbon' film

carbon film

530 R

39 kR

1

kR

12

kR

5%

0.3

5%

0.3

5%0.3W

5%

0.3

W

R935

carbon

film

1.2

kR5%

0.3

W R936 R937 R938

carbon

metal

carbon

film

lWC2

270

kC2

100R

5%0.3

1%

1/4

5%0,3

W

PRINT

BOARD

X

-

AF

DbTECTQR,

CAPACITORS

CODE

900-249

Designation

CRlOOl CR1002 CR 1003

polyester po 1 yester polyester polyester

ceramic ceramic

diode diode BAV10 diode

WVlO

I

N4002

68

nF

68

nF

0.47

pF

0.47

pF

1

nF

0.1

pF

DIODES

Accuracy

max.

voltage Fig.

and

Code No.

Code

No. Shown in

Shown

Fig.

in,

CR1004

CR

1

005

Designation Type

Pl

000

Designation Type

QlOOl

Q

1002

Q

1

003

diode I Zener

terminal strip,

transistor

N4002

diode

2N930

2N3906

8C149

~2~86~5~6

TERMINALS

15

p~le

TRANSISTORS

.

Code No. Shown

Fig.

Code

No;

Shown in Fig.

in

H39

RESISTORS

Designation

Rl

001

R 1 002

R

1

003

R

1

004

R 1 005

R

1

006

R

1

007 R1008 R1009

RlOlO

RlOll

R1012 R1013

Type

carbon carbon carbon carbon

carbon carbon carbon carbon carbon carbon carbon carbon

film

potm.

film film film film film film

film

film film film

metal film

Value

18MR $%@W

0.5

MS2,

5.6

MZZ

470

kQ

180 kQ

approx. opprox,

5%

12

$60

Iin.

0.3

kC2

1/2

t2

W

0.3

1.2kS2 5%0.3W 120kR 5% 0.3

W

1.8kQ 5%0.3W 10

kR

5% 0,3 W

1.5

kR

5%

0.3

W

W, W,

selected

Code No.

Shown in

Fig.

R1014

R1015 R1016

metal

carbon

film

PRINT BOARD

XI

-

POWER

CAPACITORS

SUPPLY,

CODE

900-250

Designation . Type

CllOl C1102 C1103 C1104 C1105 C1 106 C1107 C1108 C1109 ClllO

electrolytic ceramic ceramic

polyester polyester

polyester

electrolytic ceramic polyester polyester

Value

1000

pF

0.1

pF

15

pF

1

PF

33

nF

0.22

yF

1000

pF

33

pF

2.2

nF

0.22

pF

DIODES AND

Accura~y

max. voltage

25

V

30

V

&5%

10% 160

10%

25

V

400

160

V

*5%

100h 400 10% 160

V

RECTIFIERS

and

Code

26 1 -029 HI

No.

Shown

Fig.

1

213-009 HI 1 210-215 HI 1

24 1 -004

240-533

24

1 -002

261 -029

HI HI HI

HI

1 1

1

2 10-233 HI 1

240-422 HI 1 24 1 -002 HI1

in

Designation

CRllOl CR1102 CR1103 CRllOll CR1105 CR1106 CR1107

Designation

JllOO

Type

di ode

diode

rectifier

zener diode zener

diode

I

N4002

I

N4002

B80C2000

diode

1

N4002

BAX16

Type

terminal strip,

BZY88CSV6

BZY88C6V8

TERMINALS

20

contacts

Code

3

50-409

6de

No.

Shown

Fig.

HI1

Shown Fig.

in

'

in

PI

100

terminal strip,

20

contacts

TRANSISTORS

Designation

QllOO QllOl (21102 Q1103 Q1104

,

'

Q1105 Q1106

Designation

RllOl

Type

transistor transistor transistor transistor

transistor transistor

transistor

Type

cqrbon potm.

2N2905A

BC149 BC149

2N3906

2N2905A

BDY92 BDY92

with insulated mounting with insvlated mounting

RESISTORS

Value

1

MR,

lin.

Code

No.

360-062

Code

No.

Shown in Fig.

Hll

Shown in Fig.

R1102

xR1103

R1104 R1105 R1106 R1107 R1108 R1109

RlllO

Rllll

R1112 R1113 R1114

R1115

R1116

carbon film

w

ire-wound carbon film carbon film carbon film

carbon film carbon film wire-wound carbon film carbon film

carbon film carbon film carbon film carbon potm. carbon film

1

MR

6.8 12

68

2.7

82

2.7

2

1.2 150

2.7

5.6

2.2

1

kR,

2.7

$2

R

Q

n

5%

$2

5% 2.5

5%

kS2

5%

kR

2%

kR

Q

5%

kn

kQ

kR

lin.

kR

0.3

W

0.3

W

5%

0.3

W

5% 0.3

112

w

5% 0.3

0.3

5%

0.3

5%

0.3

5% 0.3

W

X

indicates special parts manufactured

by

Radiometer.

carbon film

1.2

kQ

5% 1/2

W

Designation

W1101

carbon wire-wound carbon film carbon carbon film carbon film carbon metal film metal film carbon film carbon film

Type

power line with plug,

film

potm.

film

1.2kR 5%0.3 W

8.2

R

5%

2.5

W

330

Q

5%

0.3

W

1

MR, lin.

2.7

MR

5%

1/2

loon

4.7

4.4

2.2

4.7 kR

5% 0.3

kR

5%

0.3

kS2

0.5% 1/4 W

kR

0.5% 1/4

kS2

5%

0.3

5%

0.3

w

W

CABLES

1.7

rn

W

Code

6

15-005

No.

Shown

Fig.

HI

1

in

W1102

Designutlon

Tll

01 transformer

shielded cable,

Type

0.5

TBS593

m

TRANSFORMER

Code

No.

770-593

X

indicates special parts manufactured by Radiometer.

CAPACITORS

Designation

Type

trimmer trimmer trimmer tr

i

mmer ceramic ceramic ceramic ceramic ceramic ceramic

ceramic ceramic

Val we

Code

No.

I

k.

i

Designation

xL1201

L

1202 ferrite

L1203 ferrite

L1204

Type

coil

ferrite

tube, tube,

tube, 7

15

15 mm

mm

INDUCTORS

mm

Code

No.

Shown in

Fig.

i

X

indicates special parts mgrlufactured

by

Radiometer.

TERMINALS

Designation

.

PI200

Designation

Q1201 transistor BF173 Q1202 transistor BFW30 Q1203 transistor BFW30

Type

terminal strip, 13

Type

pole

TRANSISTORS

RESISTORS

Code

805-639

No.

H

12

We

360-095 ~12

No.

Shown Fig.

in

Designation

Type

carbon film carbon film carbon film carbon film carbon carbon film carbon film carbon film cermet potm,

film

Type

Value

SWITCHES

We

No.

Code

Shown in

Fig.

No. Shown in

Fig.

$1201 switch

"CHANNEL"

H45

CABLES.

Designation

Wl201

Designation

Type

coaxial

Type

crystal holder

x

.pointer knob

cable,

1

10

(HC

R

MISCELLANEOUS

25/lJ)

6de

Code

8

1

6-201

No.

852-1 1 1

indicates

special

parts manufactured

by

Radiometer.

MODIFICATIONS FOR MODULATION

The

coa~ial bushing J1, code 800-108, of the Modulation Meter, type AFM2,

METER,

TYPE

AFM2$3

is

re-

placed

by

the coaxial bushing J1, code 800-203,

in

the Modulqtion Meter, type

AFM2S3.

.

,-

--

-

--

MODIFICATIONS FOR MODULATION

-

.-

.

---

--

-

METER.

---

TYPE AFM255

The following components are removed from the regular Modulation Meter, type AFM2, and replaced

Designation Type

as

follows in the Modulation Meter, type AFM2S5.

Value

polystyrene carbon film carbon film

700

pF

330 R

1 kQ

5%

0.3

W

Code No.

Shown

Fig.

H9

in

metal film metal film

metal

film

corbon potm. corbon potm. metal film

Designation Type

C908 polystyrene C918 ceramic R912 carbon film

R917 carbon film R919 metal film R920 metal film

36.1

kR

1%

850 n 1% 114

2.04

kSZ

1%

1/4

10

kQ, lin.

kR,

10

50 kR

lin.

1%

114

Value

pF 5% 125 V

150

0.5

pF

5%

1.2 kR 5% 0.3

680 R 0.5

75

kQ 1% 0.2

600 R

1%

W

0.2

1/4

w

W

5%

W

Code No.

W

R923 carbon potm. R924 metal film R939 carbon film

25 kR

100

kR

kQ

330

lin.

1%

5%

0.2

W

'

MODIFICATIONS FOR MODULATION

METER.

TYPE

AFM2S6

The following components are removed from the and replaced

Designation

C317

R320

Designation

C317

R320

as

follows in

Type

ceramic carbon film

Type

ceramic carbon film

the

Modulalion Meter,

(APM?)

Va

Iue

10

pF

150

R

Value

22

pF

56

R

5%

0.2

regular

type

0.3

W

Modulotion Meter, AFM2S6.

Code

21

Code

21

type

AFM2,

NO.

0-21

0

No,

1

-222 H3

Shown

Fig.

H3

in

RADIOMETER AFM2 Operating Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Artek Media

www.artekmedia.com

Deviation

AM DETECTOR

SCALE CORDS