RADIOMETER AFM2 Operating Instructions Manual

AFM2 MODULATION METER
,
1
DIGITALY REMASTERED
By

Artek Media

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MODULATION
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I
RADIOMETER
COPENHAGEN
n
:
BDE
0
U
I
Scans by ArtekMedia © 2008
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
Scans by ArtekMedia © 2008
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
Scans by ArtekMedia © 2008
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
Scans by ArtekMedia © 2008
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
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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
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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
is
is
to be
greater
0.5'
-1.5%
to
Less than typically
100
50
Hz
Hz
FM
(r.m.s.) up to
FM
(r.m.s.).
1002
MHz,
Notes:
Scans by ArtekMedia © 2008
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
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+
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
Scans by ArtekMedia © 2008
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
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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.)
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
Scans by ArtekMedia © 2008
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
Scans by ArtekMedia © 2008
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
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
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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
Scans by ArtekMedia © 2008
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
Scans by ArtekMedia © 2008
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
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
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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
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
is
utilized
is
in po-
high de-
separation.
followed
of
by
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-
Scans by ArtekMedia © 2008
-
R
F
Input
XI1
R
F Local
Att.
t
Mixer
-
ROMAN FIGURES REFER TO
DIAGRAM NUMBER
*.N AUTO
TUYlYC
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osc.
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u
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I
-
11
IF Frequency
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I
1
I F
111
IF
Output
1
L
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VI
7,
7,
VII
10
2"
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XI1
-
Low Pass
Filter
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-
\
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IF Check
/
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-8
VIIL
/
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Fig.
Filters
Deem-
phases
/
/
/
/
I
I
I
$.YE!.!
Kl°C
m
Dl
. Block-diagram of
-
-
IF
Level
I
x
olF Check
I
the
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1.
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,,"El
.SZ.<G.
SLOW
lbl,
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Em
Modulation
Meter,
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type
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zi::
AFM2.
IF
CHICI
Level
the AF OUTPUT connector by sliding
Scans by ArtekMedia © 2008
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
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
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
is
seven-
is
a five-
300kHz.
in
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.
Scans by ArtekMedia © 2008
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
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
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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
Scans by ArtekMedia © 2008
AFM2.
Section
Scans by ArtekMedia © 2008
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.
Scans by ArtekMedia © 2008
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
is
wanted, an
METER
3,
the modula-
is
the de-
is
to be measured.
approx. half of
-
MEASURING FREQUENCY DEVIATION
Scans by ArtekMedia © 2008
(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
I
I
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
kHz
Frequency Deviation
1300

Deviation

*300
kHz
Frequency
kHz
both peaks of modulation: a difference
Scans by ArtekMedia © 2008
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
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)
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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
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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
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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
is
Q308
at a
(if
Q310.
RI
B
I)
is
Q307.
signal to
BAND-
lM
IF
phase-
This
at
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asymmetry of the
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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
is
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
is
ference detector, CR601 and CR602, and
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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
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
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
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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
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
is
V)
used
Section
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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 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
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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
Scans by ArtekMedia © 2008
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)
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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
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
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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
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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)
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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
LEVEL
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
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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
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
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)
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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
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)
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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
200
kHz
and
check that
kHz
from the IF CHECK
AF AMPLIFIER
Scans by ArtekMedia © 2008
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)
Scans by ArtekMedia © 2008
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
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)
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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
Scans by ArtekMedia © 2008
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
Scans by ArtekMedia © 2008
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
be
AO.
1
F
~0.1%
%
strap
Fig.
A
G3.
AM
Detector
IF
Output
printed
+
Amp.
cct. board
POWER
Scans by ArtekMedia © 2008
SUPPLY
G
16
AF DET. AFAMI? FMDET.
Ill
-v
/
IF
FILTER
<
(NARROW)
Fig.
G5.
Fig.
Scans by ArtekMedia © 2008
G6.
Power
pup
P~Y
\scale
dru~n
Fig.
G7.
-long
Scans by ArtekMedia © 2008
cord
4
Short
cord
spring
Fig.
G9.
HI.
Scans by ArtekMedia © 2008
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
Scans by ArtekMedia © 2008
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
V
2%
63
V
1% 63
2%
63
V V
LAMPS
Designation Type
I
I
neon lamp, yellow,
110
V
TERMINALS
Code No.
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
iack, black
F-83G
Code No.
B.73
terminal strip, 26-pole terminal strip, 16-pole
J700
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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
mm
mm
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%
0.2%
kR
114
w
1/4
W
0.2% 1/4
W
metal film
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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,
Scans by ArtekMedia © 2008
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
.o,
d
d
0
m
0
rr)
rr)
C3
E
E
ddddddddddd
00 00
CO 00COCO
1111111111
oooooooo
.
.o
. .2 .
.o
.I!
.O
.o .o
.D
d
o
III
o o
MISCELLANEOUS
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Designation
Type
pointer knob pointer knob with wing
x
knob
x
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
Scans by ArtekMedia © 2008
.
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
pF
pF
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/+80%
-
20/+800/0 25
25
25
V
V
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
pF
pF
-2O/t800/a 25
+2%
%0.5 k0.25
100
pF
pF
V
v
NPO
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)
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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
3.2
3.2
TRANSISTORS
Type
transfstor transistor
2
N3906
BC149
Code
No.
4104
X
.indicates special
tramfstor
parts
BC147
mnufactud
by
Radiometer.
RESISTORS
Scans by ArtekMedia © 2008
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
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 metal film
106422 106-51 0 140428 H-1
R1313
R13 14
'
metal film metal film
HI0
Scans by ArtekMedia © 2008
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
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
Scans by ArtekMedia © 2008
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
V
Code
213-01 210-133 H3
213-01
No.
1
1
Shown in, Fig.
H3
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
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
V
1
H3
DIODES
Scans by ArtekMedia © 2008
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
Code
Code
No. Shown in
Fig.
No.
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
2N3906
BC
149
RESISTORS
Scans by ArtekMedia © 2008
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
0.3
W
W
W W
W
W
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 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
W
W
W
W
W
W
carbon film
2.2 kR 5% 0.3
W
carbon film
Scans by ArtekMedia © 2008
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
5%0.3
kR
5%
kR
5%
R
5%
R,
0.3
lin.
W
0.3
0.3
0.15
W
W
W
W
W
m
Code
No. Shown in
Fig.
PRINT BOARD IV - IF FILTER (NARROW), CODE 900-243
Scans by ArtekMedia © 2008
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
pH
pH
pH
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
Scans by ArtekMedia © 2008
Designation
Designation
Designation
terminal strip,
Type
transistor transistor 2N3904 transistor 2N3904
2N1711
15
pole
TRANSISTORS
RESISTORS
Value
Code No.
Code No. Shown in
Code No. Shown in
Sh~wn in Fig.
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
Scans by ArtekMedia © 2008
BOARD
V
-
AM
DETECTOR
CAPACITORS
.I
IF
OUTPUT
AMP,
CODE 900-244
Designation
polystyrene
ceramic
polystyrene
ceramic
ceramic
polystyrene
ceramic
ceramic
tantalum
ceramic
cerornic
ceramic ceramic
Value Accuracy and
max. voltage
Code
No.
Shown in Fig.
L
L
I
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
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% 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
V
V
V
1
2
V 213-017 H5
V
V
213-01 213-01 213-017 H5
243- 1 08
213-017 H5
243- 108 H5
1
1
H5
H5
H5
C528 polyester 10
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C
529 tantalum
20
pF
pF,
10% 63
6
V
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
in
Q504
Scans by ArtekMedia © 2008
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
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 film
carbon
Scans by ArtekMedia © 2008
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
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%
5%
0.3
0.3
W
W
carbon
Scans by ArtekMedia © 2008
carbon
carbon
carbon carbon carbon
film film film
potm, film film
100
3.3
12
1
kR,
1.8
8.2
kR
kn
kQ
kR
kR
5%
5%
0.3
5%
0.3'~
lin.
5%
5%0.3
0.3
0.3
W
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
film
82 kR
TAG
STRIPS
5%
0.3
W
Code
No.
Shown
Fig.
in
PRINT
Scans by ArtekMedia © 2008
BOARD
VI
-
LIMITER,
CAPACITORS
CODE
900-245
Designation
C608
ceramic
polystyrene tantalum tantalum ceramic
ceramic ceramic
tantalum
polystyrene ceramic
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
tantalum ceramic
22
10
470
10
47
10
22
nF
pF
pF
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
Scans by ArtekMedia © 2008
tantalum
10
pF
C628 tantalum
C630
C63
1
Designation
CR60
1
CR602
ceramic tantalum
Type
diode
diode diode BAX16 diode BAX16
diode
diode
Zener diode
diode
BAVI BAVI
BAVIO BAVI
BAVlO
0
0
0
1
N3497
10
pF'
2.2
nF
10
pF
DIODES
Code No.
Shown in
Fig.
diode
diode
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
Code
No,
No.
Shown in
Fig.
Shown in
Fig.
transistor transistor BC149 transistor transistor 2N3906 transistor 2N3906
BC149
BC149
transistor
Scans by ArtekMedia © 2008
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
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
W
W
W
W
W W
W
W
W
carbon film carbon film
5.6
68
kR
kR
carbon
Scans by ArtekMedia © 2008
carbon
carbon carbon carbon carbon
film film film film
film
film
68
10 10
kS2
1
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
W
W
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
0.3
0.3
0.3
0.3
W
W
W
W
W W
W
W
W
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 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
0.3
W
W
W
W
W
10 R 5% 0.3.W
6.8
kR
5%
0.3
6.8
kR
5% 0.3
W
W
carbon film
Scans by ArtekMedia © 2008
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
0.3
W
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
W
W
4.18 kR 1% ZZ
kR
kR
kR
kR
10%
1%
5%
5%
5% 0.3
5%
0.3
0.3
0.3
W
W
W
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
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
W
W
W
W
Code No. Shown in
Fig.
m
indicates special parts manufactured
by
Radiometer.
PRINT
Scans by ArtekMedia © 2008
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
nF
nF
pF
5%
-20/+80% 30 V 213-016
-20/+80% 30 V
-20/+80% I5
V
30
V
Cade
21
21
No.
1-239
3-016
213-016 267-000
Shown in
H7
H7
H7 H7
H7
\.
i
.
!
I
4
I
I
i
polyester
C715
Designation Type
CR70
1
CR702 CR703
CWO4
CR705 CR706
polystyrene
zener diode zener diode diode
diode
diode
diode
BZY88C3V3
BZY88C3V6 5082-281 5082-2 5082-2
8
8
BAXl6
1
1
1
1 1
4.7
nF
DIODES
5% 63
V
'
243-021
Code
No.
H7
Shown in
Fig.
H28
Scans by ArtekMedia © 2008
RELAYS
Designation
K700
~esi~nation
x L701 xL702,
L703
Designation
Type
gas relay
Type
choke, choke, choke,
47
Type
203 394
pH
pH
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
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
Scans by ArtekMedia © 2008
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
carbon film
carbon film
carbon film
filrn
R728 R729
carbon film
carbon film
R730
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R73
1
carbon film carbon film
82
1.8
kR
kR
5%
5%
0.3
0.3
W
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
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
kR
R
kR
kR
kR
kR,
I&,
5%
5%
1%
1%
1%
5%
0.3
0.3
1/4
1%
5%
W
l/4
W
1/4
0.3
0.3
0.10
W
1/8
W
W
W
W
W
m
106-433 106-568 140-380
140-379
1401.2
99
Code No, Shown in
H7 H7
H7
H7
H7
Fig.
PRINT
Scans by ArtekMedia © 2008
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,
choke,
choke,
BAV10
400 400
400
BZY88C6V8 BZY88C6V8
INDUCTORS
pH
pH
pH
by
Radiometer.
Code No. Shown in
Fig.
Code No. Shown in
Fig.
choke,
Scans by ArtekMedia © 2008
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.
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%
5%
lin.
5%
1%
0.3
0.3
1/8
W
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
1
4.7
kS2
kR
kR
5% 0.3 5%0.3
5%
0.3
W
W
W
.:
carbon
Scans by ArtekMedia © 2008
carbon 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
0.3
0.3
0.3
W
0.3
W
W
W
W
carbon
carbon
carbon carbon carbon carbon
metal carbon metal
metal
film
film
film 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
0.3
0.3
0.5%
W
W
W
W
W
W
W
W
1/4
W
PRINT
Scans by ArtekMedia © 2008
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
Scans by ArtekMedia © 2008
INDUCTORS
Designation
x ~901 choke, 197 xL902 choke, 394 xL903 choke, 203
Designation Type
P900 terminal strip, 20
Designation Type
Type
pH
pH
pH
TERMINALS
pole
TRANSISTORS
Code No. Shown in
Fig.
Code
Code
No.
No.
Shown in Fig.
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
Scans by ArtekMedia © 2008
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%
5%
MR
5% 1/2 W
MR,
0.3
0.3
lin.
680 R 5% 0.3
kR
W
W
W
0.3
W
carbon film
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
W
W
R935
Scans by ArtekMedia © 2008
carbon
film
1.2
kR5%
0.3
W R936 R937 R938
carbon
metal
carbon
film
film
film
lWC2
270
kC2
100R
5%0.3
1%
1/4
5%0,3
W
W
W
PRINT
Scans by ArtekMedia © 2008
BOARD
X
-
AF
DbTECTQR,
CAPACITORS
CODE
900-249
Designation
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
transistor
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
Scans by ArtekMedia © 2008
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%
5%
5%
12
$60
Iin.
0.3
0.3
kC2
1/2
t2
W
W
W
0.3
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
selected
Code No.
Shown in
Fig.
R1014
R1015 R1016
metal
metal
carbon
film
film
film
PRINT BOARD
Scans by ArtekMedia © 2008
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%
10%
25
V
400
160
V
V
V
*5%
100h 400 10% 160
V
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
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
diode
I
N4002
I
N4002
B80C2000
diode
1
N4002
BAX16
Type
terminal strip,
BZY88CSV6
BZY88C6V8
TERMINALS
20
contacts
Code
3
50-409
6de
No.
No.
Shown
Fig.
HI1
Shown Fig.
in
'
in
PI
100
terminal strip,
20
contacts
TRANSISTORS
Scans by ArtekMedia © 2008
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%
5%
kS2
5%
kR
2%
kR
Q
5%
kn
kQ
kR
lin.
kR
0.3
0.3
W
0.3
W
5%
0.3
0.3
W
5% 0.3
112
w
5% 0.3
0.3
5%
0.3
5%
0.3
5% 0.3
5% 0.3
W
W
W
W
W
W
W
W
W
W
X
indicates special parts manufactured
by
Radiometer.
carbon film
Scans by ArtekMedia © 2008
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
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
W
W
CABLES
1.7
rn
W
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
Scans by ArtekMedia © 2008
Designation
Type
trimmer trimmer trimmer tr
i
mmer ceramic ceramic ceramic ceramic ceramic ceramic
ceramic ceramic
Val we
Code
No.
I
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
i
X
indicates special parts mgrlufactured
by
Radiometer.
TERMINALS
Scans by ArtekMedia © 2008
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
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
Scans by ArtekMedia © 2008
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.
No.
852-1 1 1
indicates
special
parts manufactured
by
Radiometer.
MODIFICATIONS FOR MODULATION
Scans by ArtekMedia © 2008
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%
5%
0.3
0.3
W
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
W
W
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
Scans by ArtekMedia © 2008
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%
5%
5%
5%
0.2
regular
type
0.3
W
W
Modulotion Meter, AFM2S6.
Code
21
Code
21
type
AFM2,
NO.
0-21
0
No,
1
-222 H3
Shown
Fig.
H3
in
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