siemens 745E310A Service manual

Π ΓΠ Ι ELECTRONICS

c 0 N T E N T S

745Ea

I

1. GENERAL .........................................

2. TECHNICAL DATA .......

2.1 - FREQUENCY RANGE ...........*......

2 . 2- TUBE COMPLEMENT

2.3 - SCALE GRADUATION

2.4 - RF INPUT ................*

2.5 - INTERMODULATION ..

2.6 - AUDIO OUTPUTS

2.7 - POWER SUPPLY ........

2.8 - DIMENSIONS AND WEIGHT

3. BASIC F U NCT I ON

3.1 --BANDS 1 AM) 2 ..........................*..............

3.2 -'BAUDS 3 AND 5 ....................*......*........... T

3.3 - BAM) 4 ..................................

3.4 ~ BANDS 6 TO 12 ................*

3 * 5 - BLOC DIAGRAM ......................... · .............

..........................*..........

.....................*

.......

.................................V ’ 3

......................................... b

* * * *

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

..........*.....

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

.......*..........................

......................*.....

..........*......*......

...........*.....

.·····.·

’

'

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

* *

...........

•......... 7

2

* J

6

**’ 6

7

.................................. 8

p

n
g

3.6 - FREQUENCY SCHEDULE ..............................*.....

. 4, FUNCTIONS OF THE SUBASSEMBLIES ....................... 10

4.1 - RF SECTION .........................................

4 . 2 - CALIBRATING OSCILLATOR ...................

4.3 - FIRST MIXER STAGE AND FIRST OSCILLATOR ..............

‘ ' 4.4 - DOUBLER * · · ...................

4.5 - INTERMEDIATE FREQUENCY 1, 2nd MIXER STAGE AMD

2nd OSCILLATOR ....................*....................

4.6 - INTERMEDIATE FREQUENCY 2, DEMODULATION, GENERATION

OF THE AUTOMATIC CONTROL VOLTAGE ...................

4.7

AUDIO STAGE, NOISE LIMITEH

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

...... 11

.........“** 11

*........* ’ 13

4.8 - AUDIO STAGE AND FINAL STAGE

4.9 - TUNING INDICATION ..................

·.··*

....*.. .. .

4,10- POWER SUPPLY UNIT ................. ...............

.

....

9

12

15

15

' .

SAIT

j£fe<frfl*0gA.|

ELECTRONICS

5 , .layout

6 . OPERATION ..........

6.1 - PROCEDURES PI LOR TO PLACING INTO OPERATION

6.2 - PLACING THE RECEIVER INTO OPERATION ..

7„ MAINTENANCE

7.1 - CLEANING, SERVICING, SUPERVISING

7-2 - CHECKING THE CRYSTAL OSCILLATOR ................... 22

7.3 - REMOVING THE FRONT P A N E L
7«4 - REPLACING PARTS

7.5 - ALIGNMENT

7.6 - ALIGNMENT OF FREQUENCIES FOR. TRACKING

7.7 - GUIDING VALUES FOR THE CORE POSITIONS,

7.8 - TROUBLE SHOOTING ... *

8 . COMPONENTS L I S T

...................................... 21

........................................... 36

..............*...............

......

....

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

......

............ 20

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

....................... 23

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

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

............................... 32

......

......

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

.......'----

1 6
18

18

21

24
25

30

31

' 8 .1 - INPUT SECTION (STAGE 1 TO 4 ) ......................

8.2 - FREQUENCY CONVERTER SECTION (STAGES 5, 6 and 7 )*· 43

8.3 - AMPLIFIER SECTION (STAGES 8 TO 1 4 ) ................ 46

8. 4 - POWER SUPPLY SECTION (STAGE 15')

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

36

51

Ι31Π ELECTRONICS

1 ϊ&ίάΜΜίΛ. 1

745 Ea

.1

ALL WAVE MARINE RECEIVER

745 Ea

1 - GENERAL

The superheterodyne all wave comnruni cat ions receiver is
of the highest grade and covers the frequency ranges 14 to 2 1 Kc/S^
and 85 Kc/s to 30,3 Mc/s in twelve bands ; in its shortwave banas it

operates with double frequency conversion. .The frequency bands are se
lected with pushbuttons. For incremental control of receiving frequen
cies above 15 Mc/s the second oscillator can be detuned by up to 100

Kc/s in ganged tuning with the circuits of the first intermediate fre

quency. Each 100 Kc/s scale division on the main scale can be checked
against a built-in crystal spectrum generator.

Temperature-compensated layout of the frequency-deter

mining stages, temperature-resistant materials and components and

impregnation of moisture-sensitive components makes the receiver wide
ly immune to climatic conditions and suitable even for deep-sea

navigation.

The receiver may be operated from AC or DC ship’s main

or from 24 volts storage battery.

It may be supplied either as a separate unit contained
in a robust metal cabinet for bench mounting or be incorporated in
the SAIT console as Main or Emergency receiver.

2 - TECHNICAL DATA

Types of reception :

A1

_ _ .

A2

Unmodulated telegraphy in all frequency bands

_______________

_

__________________________________________________________

Modulated telegraphy in the frequency bands between

170 and 30.300 Kc/s

A3-

Telephony in the frequency bands between

1 70 and 30.300 Kc/s

ELECTRONICS

fr eq ue ncy RANGE

Band 1

' 6

1 0

1 1

1 2

1 4 to

2

3

4

5

7

8

9

85 to

1 70 to

340 to

7 2 0 to

1 500 to

3100 to

6000 to

9 7 00 to

21 Kc/s (xx)

175 Kc/s
350 Kc/s

730 Kc/s

,1540 Kc/s

3100 Kc/s (x)

6300 Kc/s (x)

0,200 Kc/s (x)

15,200 Kc/s (x)

14,700 to 20,200 Kc/s (x)

1 9 , 700 to

25,200 Kc/s (x)

24,700 to 30,200 Kc/s (x)

The up to 100 Kc/s that can he set on the frequency interpolator

scale have to he· added to the frequency values read on the main
scale.

14 to 25 Kc/s optional,

TUBE COm^MENT

U.S.A.type

6BA6

6BE6

6 AL5

. 6AQ5

4 tubes

3 tubes

4 tubes

2 tubes

1 tube

European type

EF 93

EK 90

ECC 82 1 2AU7 ..

EAA 91

or EB 91

EL 90

I

a

i

I

a

■

1

*

ELECTRONICS

1 tube EM 34

1 stabilizer tube

(input protection)

2.3«- SCALE GRADUATION^

in band 1 with 1 -kc/s divisions

2 with 5-kc/s divisions
3 with 1 0 -kc/s divisions
4 with 10 -kc/s divisions
5 with 20-kc/s divisions

745Ea 3

6 CD 7

108 C1

< 1 00 kc/s per mra
< 1 kc/s per ram

ζ 1 .5 kc/s per mm

< 3 kc/s per mm
< 5 kc/s per mm

0B 2

■

■

■

in bands 6 to 1 2 with 1 00 -kc/s divisions

with incremental control

2.4'.- R.F._INPUT_

Bands 1 to 6

7 to 12

Receiver is operation

Warmup for full calibrating accuracy
Setting error in the hands 6 to 12

after calibrating the main tuning control
agains the 100-Kc/s spectrum 1 Kc/s

Frequency drift (measured during a 10—hour operating period after

2 hours of warmup) with mains voltage variations of + 5 1°

and 5 C temperature variation in the range + 10 C to + 40 C

in the bands 1 to 5

6 to 12

Parasitic oscillator voltage at the receiver input

high-impedance, unbalanced

7 5 , unbalanced

after about one minute

< 25 kc/s per mm

1 kc/s per mm

two hours

-3

+ 10

-4

(fundamental plus harmonics)

with termination into a dummy antenna

Bands 1 to 11
Bands 12 ‘

1 00 v
2 0 0 v

SAIT

ζ^άη β Η Ϊ Λ Λ.

Selectivity :

ELECTRONICS

9

I

w

i

Class-of-

Band

1 and 2

3 to 12

3 to 12 A 2/A3 narrow

3 to 12

Image frequency rejection ;

emission

A1

A1

A2/A3 wide

Attenuation

6 db for a

detuning of

f 1 (kc/s)

Band 1

Attenuation

46 db for a

detuning of

f2 (kc/s)

+ 0.3

± ° * 8

± 1
± 3.0

2 5 0 db

3

+ 1,6

± 3.1
+ 4 .4

± 7-0 1 0

7 0 db

60 db

Edge steepness

F = 40

,fn - f„

2 1

(db per kc/s)

30

.17

1 2

3

m

t

m

l

%

*

IF rejection at input :

Band 1

4

5

6 to 1 1 (1 2 )

2 5 0 db

3

4

.5

6 to 12

80 db

5 0 db

50 ( 40) db

7 0 db

80 db

60 db

60 db

5 0 db

m

SAIT

OkdutoicA.

ELECTRONICS

2.5.-_INTERMODULATION_

For an unmodulated useful signal of 100 μν
and an interfering signal of 10 mv with 50 J modulation,

20 kc/s away 1 0 %

Sensitivity and signal-to-noise ratio for 1 into 10 k£>(at audio output)

Band

1
2 to 4

6 to 12

4 and 5 A3
6 to 12

Class-of-

emission

A 1

A1
A1

A3

signal-t o-noi se

ratio (db)

1 0
1 0 < 2 .0

1 0

20

20

Input M F

(μν)

< 3.0

< 0, 6

< 40

< 1 0

Range of control for the pitch of the heat note = + 3000 c/s
Audio gain control manual

RF ^iin control automatic (AVC)or manual

Variation of the audio output voltage
With a change in RF input voltage

from 10 μν to 5 0 mv , < 4 dh
Charging time constant of the AVC system
With classes-of-emission A1 and A2/A3 0.1 sec
Discharge time constant of the AVC
With class-of-emission A1

With class-of-emission A2/A3

0. 5 to 1 sec

0. 1 sec

Noise limiting action continuously adjustable and disconnectable
Bandwidth of the audio amplifier

At the 3-db-down points

With respect to the 1 kc/s response
Distortion factor with 1. 5 μ audio output

300 to 5 000 c/s

<1C%

Unweighted noise at the loudspeaker

With full audio gain and minimum RF gain ·

Corresponding to a signal-to-noise ratio

< 90 mv

< 6 0 d b

S JJ] ELECTRONICS

2.6.- AUDIO OUTPOTS

Headphone terminal 1 rnw; 3^ - 500 Ω

745Ea 6

Internal on/off loudspeaker

Terminal for external loudspeaker

Line output

2.7·- POWER 5UEpiiY>.

^ Mains ! Via built-in power sypply unit,

may be adjusted. for 110 — 125 — 220 — 250 volts

operation at 40 60 c/s — Input power :

DC Mains ; Receiver fitted as independent unit

operation from DC Mains 110 — 220 volts
or 24 volts storage battery via vibrator, inverter
or rotary converter.

Receiver included in SAIT Console

! When the ship's mains is DC, the receiver is

powered by the Console’s Main Converter 110 volts
single phase output.

Permissible voltage variation of the power supply + 10 %

2.8.- DIMENSIONS_AND_WEIGHT

2 w / 5 Ω

0.6 w / 5 1Ω
1 mw / 600 Ω

about 100 VA.

Front panel (When the receiver is included in SAIT Console)

Width : 5 2 cm
Height :

In metal cabinet with shock absorbers (When fitted as independent Unit)

• Width :

Height :
Depth :

Weight :

30,4 cm.

55 cm
35»0 cm

3 8 cm

approx. 35 Kgs.

SAIT

£gactWtig4

3·- BASIC FUNCTION

Four different f u n c t i o n a l patterns can be distinguished; they are asso
ciated with the various bands as follows :

grams showing merely the subassemblies activated at the time, not

however switches and relays, are described hereafter.
i

ELECTRONICS

The receiver performs in different ways in the twelve "bands.

Functional pattern A with bands 1 and 2

B with bands 3 and 5
C with band 4
D with bands 6 to 12

The differences by reference to functional circuit dia

;3»1 .- BANDS 1_ AND 2

(See DWG 4-92 Fig. 2)

In the bands 1 and 2 only signals of class A1 are to be
received. The set operates with single frequency conversion. The fre
quency of the tunable first oscillator is 50 kc/s above the receiving
frequency. The intermediate frequency of 50 kc/s so generated in the
mixer stage is doubled in the following stage to give 100 kc/s, i.e.
raised to the frequency position of the following.IF amplifier.

This IF signal passes trough the second half of a quadru
ple-tuned band filter. Subsequently the IF channel splits into a
narrowband and a wide-band branch. In the wi de-band branch the AVC
voltage is produced; in the narrow-band branch the A1 signal is ampli

fied once more and finally translated to the audio position with a
carrier differing but slighty from 100 kc/s. Audio stages with noise
limiter and a final stage amplify the audio signal (difference of
intermediate frequency and variable heterodyning frequency) to be
output level desired.

3.2«- BifflDS 3 AND 5
( See DWG 4-62 Fig. 3)

Also in these bands the receiver operates with single fre
quency, conversion, but the first oscillator frequency is now 100 kc/s
above the receiving frequency so that the 100-kc/s IF signal comes
about already in· the first mixer stage. It travels trough both halves

of the quadruple-tuned filter. Subsequently the signal passes the same

subassemblies as with bands 1 and 2. The narrow-band IF amplifier

branch (Dwg.4 .9 .1 ) heterodynes and demodulates the signal (anode bend

detection) in receiving signals of class A1, the upper wideband IF am

plifier branch supplying the AVC . voltage. In the reception of signals

SAIT

i of class A2/A3 the upper IF amplifier path effects the demodulation

(diode detection); in the lower IF amplifier path the AVC voltage

• is gained.

ELECTRONICS

745Ea "

' ' ' ~

: '8

3.3.- BAKD_4

(See DWG 4-6.2 Fig. 4 )

-In this hand the receiver operates with double frequency
conversion with the second oscillator set at a fixed frequency. The
first oscillator is of variable frequency and operates 1180 kc/s abo

ve the receiving frequency. The IF1~signal of 1180 kc/s so generated
in the first mixer stage is applied to the second mixer stage via a
double-tuned filter. The fixed-tuned second oscillator operates at
1280 kc/s that an IF signal of 100 kc/s comes about in the second

mixer stage. The quadruple-tuned filter and the stages following'in
the signal path equal those for bands 3 and 5 *

3.4·- BANDS 6 TO 12
(See DWG 4-6.2.Fig. 5 )

The receiver operates with double frequency conversion

also in these bands. If it is tuned with the main scale alone, the
electrical conditions are the same as described for band 4 ,

With the incremental tuning scale, however, (frequency

interpolator) the IF1 filter and the second oscillator can be ganged-

tuned trough up to 1 00 kc/s, their frequency difference always equal

ling the constant second intermediate frequency (see .also paragraph
4-3.6). Since the incremental tuning control does not affect the fre-*
quency of the first oscillator, the receiving frequency changes to

the same extent (but in opposite direction) as the first intermediate
frequency. The RF circuits need not be returned, for they are suffi- ··

ciently wideband.

The class-of-emission switch varies the couplings in

the quadruple-tuned filter of the IF2 amplifier and thus the band

width according to the three positions > ‘A1 ", "A2/A3 Narrow» and

«Α2/Α3 Wide”. The following circuitry again equals that for the

other groups of bands.

3*5«~ BLOCK DIAGRAM
" _ # The functional circuit diagram (Dwg.4 .9 .1 ) shows the

basic interconnection of the individual receiver stages and control
elements.

At the antenna input the protective measures against

overload of the input circuits are symbolized (neon lamp, protective
lamps, cut-off relay A)* The input signal^reaches the RF preselector

....

.....

SAIT

|£foett0Ric4·)

stage which is switched to the band desired at the time with twelve

pushbuttons. By pressing,.the callibrating key a signal of 100 kc/s or

a multiple thereof can be applied from the calibrating oscillator to

the control grid of the first tube. In this procedure the antenna, the
BFO and the incremental frequency control are automatically disconnec
ted.

first mixer stage via the doubler to the second half of the quadruple-
tuned filter (lP2),.or directly to the input of the quadruple-tuned
filter, or via IF1-filter and the second mixer stage with second os
cillator to the input of the quadruple-tuned filter. The operating con
dition of the relays B and C depends on the band selected with the

pushbuttons. The quadruple-tuned filter feeds into a narrow-band and a
wide-band IF stage. In class-of-emission A1 the narrow-band (lower)IF
path supplies the signal Voltage which is heterodyned with a frequen
cy of about 100 kc/s in the A1 -demodulator, while the AVC voltage comes
about at a diode behind the wide-band (upper) IF path. In class A2/A3
this diode supplies the demodulated signal, and the other diode which
is fed by the lower IF stage, derives the AVC voltage.

ELECTRONICS

Contacts of the relays B and C lead the signal from the

The AVC voltage controls the preselector stage, first
mixer stage, second mixer stage and last IF stage. The gain can also
be adjusted by hand with the control "RF Gain”.

A common switch for class-of-emission and bandwith con

nects the demodulator activated at the time to the volume control

which is followed by the audio section with noise limiter and final

stage.

3.6.- FREQUENCY SCHEDULE

Receiving
frequency

Band

1

2 8 5 to 175

3

in kc/s

14 to 2 1

170' to 350

Frequency of

1st oscillator

in kc/s

6 4 to 71

• 135 to 225

2 70 to 4 5 0

1st inter

mediate

frequency

in kc/s

(50 ) -

(5 0)

(10 0 ) -

Frequency

of 2nd
oscillator

in kc/s

-

4

5

34 0.to 730 1 520 . to 19 1 .0

- 7 20 to 1540

8 20 to 1 640

1 180

(10 0)

1 280

-

ΡΗΏ ELECTRONICS

745Ea 10

6

1 50 0 to 31 00

2 6 80 to 4 2 80

+ (0 to 100 )

7

3100 to 6 3 0 0

4 280 to 74 80

+ ( 0 to 10 0 )

8

6000 to 10,2 0 0

718 0 to 1 1 , 3 8 0

+ (O to 100)

9

9 700 to 15,20 0

1 0 ,8 8 0 to 1 6 , 380

+ ( 0 to 10 0 )

1 0

1 4 ,700 to 20 , 200

15 ,8 8 0 to 21 ,3 8 0

+ (0 to 10 0 )

1 9 ,7 0 0 to 25 , 200

1 1

20 , 880 to 26,380

+ (0 to 100)

12

24 , 7 00 to 30 , 200

25,880 to 31,380

+ (0 to. 1 0 0)

/

2 nd intermediate frequency : 100 kc/s for each band

1 180

~( 0 to 10 0 )

1 180

-(0 to 1 0 0 )

1 180

-(0 to 10 0 )

1 180

-( 0 to 1 0 0 )

1 180

-( 0 to 100 )

1180

~( 0 to 10 0)

1 180

-( 0 to 10 0 )

1 2 80

-( 0 to 1 0 0 )

1 280

-(0-to 1 0 0 )

1 2 80

-( 0 to 100)

128 0

-( 0 to 1 0 0 )

1

0 -* rocl· CO

1 2 80

-(0 to 100 .)

1 2 80

-( 0 to 1 0 0 )

0

0 O

3

Frequency doubling : for bands 1 and 2 only

A . - FUNCTIONS' OF THE SUBASSEMBLIES j

'4.1 - RESECTIO N

( See DWG.4.9.4, (stages 1 and . 3)

A neon stabilizer tube T101 (1 Ro?) is connected

across the antenna terminal of the device to prevent overvoltage

across the antenna coils.

The antenna lead passes via contact all.2 of relay

K-101. This relay is controlled via de keying line of the transmitter

of the same station for the time this transmitter operates, the an
tenna input of the all-wave receiver is connected to.-chassis ground.
Contact all.2 is also opened, when the calibrating key is depressed,
with simultaneous energization of the indicating lamp I-10V "Cal.· y

contact AI-1* The protective lamp 1-102 limits the current in the an
tenna coils and so protects the input circuit from overload due to

n e i g h b o r i n g transmitters of higher: power. The protective lamp 1-501
p e r f o r m s in addition the same function for the bands 1 to. 5·

SAIT

£fe<fa6RtCA·

for the first intermediate frequency (1^525 = C-530 with fo=1150 kc/s
and L-500 = C-500 with fo=1110 kc/s) are connected across the input;

in band 3 a 100-kc/s wavetrap (lr~52 6 = C—531 ) and in the bands 1 and 2
a 50~kc/s wavetrap (L-551 = C-56 3) are effective. The preselector sec
tion 1 C-102 of the main tuning capacitor and the control grid of the
preselector tube V103 (1 Ro1 ) are connected via the pushbutton assem%
to the preselector coil used at the time. To suppress parasitic reso

nances, the six tuning coils not used at the time are connected to

chassis ground. The anode lead of the preselector tube includes the
interstage circuit corresponding to the band chosen; via the pushbut
ton assembly it is connected to the second control grid of the first

mixer stage 3 V104 (Ro1 ) and the second section of the variable capa
citor. All turned circuits except the one admt e d at tie; time are connec
ted to ground via the pushbutton assembly.

ELECTRONICS

With operation in the bands 6 and 7 two wavetraps

4.2 - CALIBRATING OSCILLATOR^
(See Dwg. 4*9*4» stage 2)

The calibrating oscillator is energized via the con

tact E3 by pressing the calibrating button. Cathode, control grid and
screen grid of tube V101 (2 Ro1) function as a triode section that

produces; a crystal-controlled fundamental of 100 kc/s. The following

section screen grid - suppressor grid - anode amplifies this wave with
simultaneous shaping of its waveform in a way that its anode circuit

carries all harmonics required for calibration at frequencies up to
30 mc/s. Via capacitors C—106 and C—105 the calibrating wave passes to
the control grid of tube V101 (1 Rol); the output coupling is so pro
portioned that all harmonics appear with about the same amplitude at

tube V101 (1 Rol).

Independently of the beat-frequency oscillator V305b

(11 Ro2) whose anode voltage is disconnected when the calibrating but- · .
ton is pressed, the audible calibrating beat note comes about by hete

rodyning the IF2 wave with the 100-kc/s crystal wave. Via the variable
voltage divider R— 106, R-107 (for adjusting the volume of the calibra
ting notes) it is taken from the control grid of tube V103 (2 R*01) and
applied via C-109 to the last IP stage with tube V302

For accurate setting of the frequency to 100 kc/s or
a harmonic thereof, the beat note pitch must be zeroed with the main
tuning capacitor*

( 9 Rol).

For offsetting crystal tolerances, the crystal fre

quency can be slightly pulled with the trimmer C-106.

The contact E6 is independent of the calibrating

button and serves for energizing the calibrating oscillator if its

SAIT

QjfccfaORtCA·

frequency is to be checked without disconnecting the antenna (see par.

4-7.2).

ELECTRONICS

4.3.- FIRST MIXER STAGE AND FIRST OSCILLATOR^

(See Dwg 4*9-4- stages 3 and 4)

The first mixer stage with tube V104 (3 R0l)trane-

lates the receiving signal with the wave produced in the first oscil

lator tube V105a (I RoV). With the capacitor C-135 this oscillator to

ganged-tuhed together with the preselector circuit andinterstage 01

cui+ Depending on the band chosen, the frequency of the oscillator

^ ' i s above the receiving frequency by 50 , 100 or 1.180 kc/s or in

operation with frequency interpolator by some value between 11 8 0 a^d

1080 kc/s). (Paragraph 4.3-6). The need for producing in thefirst

=tage of conversion different intermediate frequencies depending on

the band used at the time is due to the wide over-all frequency range

of the all-wave receiver. In the bands 1 and 2 the first mixer stag

produces a difference frequency of 50 kc/s which aoes not coincide

with any receiving frequency. After doubling at

signal is applied directly to the IF2 section which is

100 kc/s. Since in the bands 1 and 2 only A1 reception is
such doubling of the sideband-to-carrier interval, i.e. of .he auda

signal frequency is inconsequential» .

In band 3 the signal is translated to the 100 kc/s

position in the first mixer stage so that no doubling is required.

This band is therefore suitable for A2/A3-signals as well.

In band 4 the receiver operates with double fre-

quency conversion. The first intermediate- frequency of 1l80to/B se

cures high image frequency rejection, and the second intermediate fre
quency of 1 00 to/s provides excellent rejection of interfering signals

at nearby frequencies.

In band 5 the signal is translated directly to tie

100-kc/s position, for an intermediate frequency of 1180 kc/s would
fall in the receiving range.

In the bands 6 to 12 the receiver operates as in

band 4 with double frequency conversion, but for incremental^detuning
the IP1 filter and the second oscillator can be simultaneously detu-
led by UP to 100 kc/s. Since the input circuits are sufficiently wide-

w ! they do not participate in this incremental tuning procedure.

In all bands the first oscillator operates in a

Hartley circuit with cathode feedback (anode grounded). The ^ i l l a -
“ ave is extracted in the cathode circuit ^.a pp li ca t io n to the

{f i r st - control grid of the first mixer tube.

SAIT

4.4 - 5O U B ™

(3 Ro1 ) includes the contacts c1 1 and I)1 of the relays K-201 and K-202,

In the contact positions c1!2, b ^ (bands 1 a,nd 2) the mixer tube

feeds into a 50-kc/s circuit (L-201/C-204). Via a 100-kc/s wave-trap

(L—203/C”205) and another 50~kc/s circuit (L-204/C-206) the signal
reaches the control grid of the doubler tube V201 (5 Ro1)which is
loaded by the second half of the 100-kc/s quadruple-tuned filter» This

tube receives the screen grid voltage via contact T 1 ,,.2 b of the push

button assembly 5 the tube receives its anode voltage via switch

iSW301a for 'bandwidth control „

sion produces an IF signal of 100 kc/s which via the relay contacts
c , b reaches the input of the quadruple-tuned'filter in stage 9 „
In these bands no anode current flows in the second mixer tube V202

( 6 Rc51), since the contact set e1 disconnects the screen grids from

their supply voltage. Also disconnected is the doubler stage V201

(5 R81 )· by T1 2b.

ELECTRONICS

( See Dwg.4.9,4 , stage 5)

The anod.e circuit of the first mixer tube V104

In the bands 3 and 5 the first frequency conver

>

In the bands 4 and 6 to 12 the variable double

tuned filter of the first intermediate frequency is in the anode lead

of the first mixer stage V104 (3 Rol).

4.5 - im m W Z A T E J ^ E Q jm m j L 2nd. mixer STAGE AND 2nd OSCILLATOR
(See Dwg34 e9«4«j stage 6 and 7 )

In the bands with single frequency conversion
these stages are inactivated.. In those bands with double frequency
conversion the double-tuned filter of the 1st IF (1180 kc/s or 1080

to 1180 kc/s) is connected via the contact c ~ ^ of relay K-201 to the
anode of the first mixer tube VI04 (3 Bol)„ The output of this filter

goes to the control grid of the second mixer tube V202 ( 6 Rol).
:0wg.4.9 .4 shows the condition "Interpolator 0nM . When the relays '
K-203, K- 2 0 4 now receive a pulse of current, the associated contacts

transfer and the fixed capacitors C-216 and C-219 are connected in

parallel to the filter coils L-205 and L-206. The double-tuned filter
is so fixed-tuned to 1180 kc/s. At the same time the contact d ^ 1 con
nects the oscillator coil L-209 to the trimmer ca.pacitor C--233* The

second oscillator now operates permanently at 1280 kc/sj i.e. the fre

quency intermolator is inactivated.

The relays K-203 and K-204 are energized either

via the contact E1 when the calibrating button is pressed pi* via the
pushbutton contacts T1 5 or T4b when any of the lower bands is
(Selected. The relays receive further a pulse of current by the momen-

SAIT

ELECTRONICS

,:745Ea

.;14

-

tary contact T 1 to T12 of the pushbutton system when a band is chan

ged, or via the control contact S11 with any minute shift of the main
tuning control.

With energization of relay K- 2 0 4 the contact set

d closes to act as a holding contact via the normally closed push
button contact SI2 on the frequency interpolator knob assembly. The
indicating lamp"Interpolator On” (l~10l) goes out.

'T3le second oscillator and the second mixer stage
are applied via c to the regulated operating voltage 450 v only, if
the relay K-201 is energized by pushing any of the buttons 4 and 6 to

4.6 - BJTERMpiATE PREQUENCY_2, DEMODULATION, GENERATION OF THE
AUTOMATIC CONTROL VOLTAGE.~

-------------.-----

( See Dwg.4 ,9.4., stages 8 , 9* 10, 11)

t The anode lead of the second mixer stage V202

(6 Ro1) goes to the input circuit of the quadruple-tuned 100-kc/s

filter, whose bandwith can be varied in three steps with the class-of-
emission switch SW302a/b/SW301 a , depending on the class-of-emission
selected. At the output of this filter two amplifier stages are ar

ranged with tubes V302 ( 9 Rol) (with L-307/L-308) and V301 ( 8 R'd1 )

(with L-309/L-310) of which the latter is narrower in bandwidth. In
class A1 it is used for amplifying the signal. In this setting the.
control grid of tube V301 (8 R o 1 ) is connected to the AVC voltage

lead via L-305 and switch S1b; the gain of tube V302 ( 9 Ro1 ) is not
controlled, however. The filter In the anode circuit of tube V302

(9 RBI) is of greater bandwidth and followed by the diode section V3 0j*

(10 Rc51) which in class-of-emission A1 produces the AVC wolt.age for

application to the AVC line via the switches SW304b and SW305,

In the position A2/A3 the switch SW301b discon

nects the AVC line from tube V301 (8 Ro 1). The primary of the IF2
filter after tube (RO1) is connected to the diode section V303b

(10 R02) at whose anode the AVC voltage is taken in class-of-emission
A2/A3. The signal is here amplified by tube V302 ( 9 Ro1 ) whose contrdL
grid is connected to the AVC line via R-307, SW304a. The tubes V101

(1 Ro1), V104 (3 Ro1) and V202 (6 R ’o'1) are connected to the AVC line
in all classes-of-emission.

In class-of-emission A1 the narrow-band branch is

thus used for amplification of the signal, and the wide-band branch
for deriving the AVC voltage; with the classes A2 and A3 conditions

are reverse.

In class-of-emission A1 the switch SW 303a which
connects the volume control R-323 to the demodulator active at the
time is applied to the anode of tube V305a (11 Rol). The control grid

of this -tube -which -operates -in.—the lower—bend-of...the.,-characteristic,

el e c t r o n ic s

■receives beside the input signal a 100-kc/s wave generated by,the bealr-
frequency oscillator (tube V305 (11 R82)). The capacitor C-342 can.vaiy
the frequency of this oscillation by i3kc/s.An additive'mixing os this

wave with the on/off keyed carrier results in an audio beat note whose'
pitch depends on the setting of capacitor C-342.

With the switch SW303b the BPO is disconnected

from its supply potential in the classes-of-emission A2/A3; it is also
disconnected with contact E4 whenever the calibrating button is pres

sed.

The RF and IF gain of the receiver can also be

controlled by hand. For this purpose the switch SW305 disconnects the

AVC line from the regulating diode and applies it to the wiper of the

potentiometer R-320 which is connected to a negative potential. A de
pression of the calibrating button connects with contact E2 the AVC
line always to the regulating diode, irrespective of the position of

SW305,

" 745Ea

1 5

(See Dwg.4-9-4? stages 10 and 12 ).

: After amplification in tube V3G4a (ίο Ro3) the

audio signal is applied in stage 12 to a double diode whose cathodes
are interconnected and applied to a variable negative bias. The diode

section V307a (12 R<51 ) becomes conducting only at voltages exceeding
a minimum depending on the cathode bias; negative peaks beyond a cer
tain value thus are.limited. On the other hand the diode section
V307b (12 Ro2) becomes conducting only at voltages not exceeding a
certain maximum; positive peaks beyond a certain value thus are limi

ted as well. The onset point of the limiting action can be adjusted '
with the aid of the potentiometer R-3 46 corresponding to the respec
tive receiving conditions. With ‘the switch SW306 the limiting action

can be disabled.

4*8 - AUDIO STAGE AND FINAL STAGE

(See Dwg.4 .9 ,4, stages 12, 13 and 14 ).

After the noise limiter the audio signal reaches
the second amplifier stage V304b (12 Ro3) and ultimately the final *
stage V308 (13 Ro1), The anode circuit of the final tube includes an
output transformer which besides the winding for the built-in loud

speaker has terminals for the connection of 6 0 0 Ω lines as well as

high—impedance outputs for a second loudspeaker and headphones· The
built-in loudspeaker can be silenced with the push-pull switch SW3 07
combined with the volume control R-323* -

ί4*9 ~ TUNING^INDICAT I ON

( See Dwg. 4 .9 ,4 , stage 11)

J J jjj ELECTRONICS

The control grid, of the tuning indicator tube
V306 (11 Ro3) (magic-eye tube) is connected to the AVC line. With re
connection of the receiver for manual control the indicating tube re
mains connected to the AVC line so that a tuning indication is possi

ble also with manual control,

4.10 - POWER SUPPLY JJNIT
(See Dwg.4*9*4°? stage 15)»

The power supply unit, stage 15» feeds the re

ceiver, The power transformer .can bereconnected for primary voltages

of 110, 125, 220, and 250 v. Operation from DC mains or storage bat
tery is possible via a vibrator inverter .or rotary converter. Its in
put circuit can be looped via two switch contacts in the receiver that
are ganged with the switch of the power transformer. The vibrator in
vert er (or rotary converter) is so also under control of the receiver

on/off switch.

The power transformer has three secondary windingp

The heater winding is so designed that apart from the 6.3-v tap for

the heater supply of the receiver tubes a voltage-of about 9*5 v is
available which·,supplies regulated 6 . 3 v for heating the two oscilla
tor tubes via the Thernewid resistor (resistance with negative tempe
rature coefficient) R-402 and ballast resistor R—401. From the
AC the DC supply voltage for the relay circuits is also derived via

a rectifier 403 and filter capacitor C-401.

A secondary winding (220 v AC) produces 230 v DC
for the anode and screen grid supply via a rectifier bridge 4 ^ a 11^ ·
filter network C—4 02/C—403? L—4 0 1.

A regulated voltage of 150 V is taken at the neon

stabilizer tube V401 (15 H81 ) for the anode supply of the oscillator
tubes and the screen grid supply of the mixer tubes. Via a rectifier
bridge 402 and filter chain C-404/C-405 , R-4 0 4 another secondary wind

ing (127 v AC) produces a voltage of 115 v for manual control and
noise limiting which is negative with respect to chassis ground.

9*5~v

5»~ LAYOUT

The all—wave receiver consists of five different

subassemblies mounted in a common frame of strong angle iron.

. 1* Input section ·.

2. Calibrating oscillator
3» Converter section

4. Amplifier section

5* Power supply unit·.

a
I

*

a

■

■

■

■

m

SAIT

EferiDwtieA-

views of the receiver slide-in chassis. The left of the slide-in chas

sis accomodates the input section which comprises the RF and oscillator
circuits with pushbutton assembly and three-section variable capacitor
for coarse tuning. The associated tubes ¥101 (1 Rol), ¥104 (3 Rol) and
Y105a/b (4 Rol/2) (RF prestage, first mixer stage, and first oscillatcr)

are arranged at the bottom of the chassis below the variable capacitor.

cillator is arranged which produces a 1 00-kc/s spectrinn with the aid
of a crystal and the oscillating and harmonic-generating stage ¥1 03

(2 Rol).

converter section'is arranged with doubler stage ¥201 (5R'dl)f second

mixer stage ¥202 ( 6 R'61j? second oscillator with buffer stage ¥203a/b

(7 Rol/2) as well as 3- three-section variable capacitor for the fre

quency interpolator.

ELECTRONICS

The annexed Figs„1 and 2 show top and "bottom

Behind the variable capacitor the calibrating os

At the right beside the variable capacitor the

a
a
a
a
a
a
a

All stages of the IF2 section (filters,amplifier

stages ¥301 ( 8 Ro1 ) and ¥302 (9 R<51), demodulator and AVC voltage diocfes

¥303a/b (10 Rol/2) as well as the additionally shielded BF0 ¥305a/b

( 11 Rol/2 ) are in the amplifier section in the righthand half of the
frame. This subassembly contains further the audio stages : Amplifier
¥304a (10 Ro3), noise limiter V307a/b (12 RB1/2), amplifier V304b

(12 R ’<53) and final stage ¥308 (13 R<51) with output transformer. The
indicating tube 6 (11 R<33) mounts above the amplifier section on

the front panel.

The power supply unit (annexed Fig.1) is arran
ged at the rear of the frame * It comprises the power transformer (rear
right) the filter choke (rear left) and in-between a neon stabilizer

tube, ballast resistor, filter capacitors and rectifiers. The layout

plan (annexed Fig. 4 ) shows the details of the setup.

For DC the subassemblies a.re interconnected via
wires (cableforms) decoupled with lead-trough capacitors and for AC
via shielded cables. Apart from the power supply all subassemblies
have separate electrical shielding; after removal of the cableforms -
and shielding cables they can be taken down singly. It aiould be noted
that the input section requires realignment after any dismounting and
remounting, Sometimes need may even arise for a redrawn main scale.
For this reason the input section should never be dismounted outside
the factory, if, possible.

a
a

1

The main tuning capacitor is controlled with the

t i m i n g knob via bronze strip and gearing on the bay frame. With .knob

pulled outward the coarse drive is activated for sweeping the scale

range in 3^/4 revolutions. With the knob· pushed.(fine drive) such co
verage takes 15x33/4 = about 56 revolutions.

ρϋ Π ELECTRONICS

With the front panel all subassemblies in the frame
integrate to a slide-in chassis accomodated in a rugged dripwaterproof
metal cabinet and attached to the latter by four screws at the comers

of the front panel. When the receiver is fitted as independent unit,
shock · mounts are provided»

The receiver slide-in chassis can also be inserted

into a bay.

6 ,~ OPERATION

a). Equipping the slide-rin chassis

The receiver is mostly supplied with tubes inserted.
Insert into the correspondingly lettered holders electron tubes, sta
bilizer tubes, and the control crystal supplied as separate items.

For this purpose loosen the four red-ringed screws at the corners of

the front panel and withdraw the slide-in chassis in a forward direc
tion from the casing by the two handles*

745Ea

58 :

b) Setting the operating voltage'

The receiver leaves the factory adjusted for 220-v
AC mains. For operation from 110, 125 or 250 v AC supplies the mains
voltage adjuster should be shifted accordingly. It is accessible at

the rear of the slide-in chassis after withdrawing the latter from the
casing. The mains voltage value, for which the unit is set, appears in

a window at the rear of the cabinet.

If only DC mains are available in case of an indepen
dent fitting, a corresponding vibrator inverter or rotary converter
should be connected in tandem with the power lead of the receiver. The

mains and the vibrator inverter should be connected to the three-ter-
minal safety sockets at the rear of the receiver. In this way the vi

brator inverter input is also brought under control of the on/off

switch of the receiver.

For operation on DC mains the receiver incorporated
in SAIT Console is powered by the Console’s main converter.

c) Antenna and ground

Connect a reliable ground lead to the grounding ter

minal at the rear of the device. Connect the antenna via the coaxial
antenna jack to the device.

d) Headphone, loudspeaker, audio line*.

A geadphone ( < 2 k$) can be connected to the jack

pair on the front panel. .

- .. Two. additional jack pairs at the rear of the device

(serve for the optional connection of an external loudspeaker ( < 5 kO)

SAIT

ΐί&ώΐβΜ£&·

and a 600 -&line (audio power 1 row,)

nal loudspeakers each receives 0 .6 watts at most.

it may happen that it feeds considerable power into the receiving an
tenna. In such case connect the jack pair ’’K e y i n g Line” at the rear of
the receiver via a two-wire line to the corresponding jacks of the

transmitter. When its carrier appears, a relay closes the keying line

circuit and so energizes relay 1 Rel A in the receiver to disconnect

the antenna from the receiver input.

6.2 - PLACING t h e r e c e i v k r _i n t o o p e r a t i o n

ELECTRONICS

With simultaneous operation of the internal and exter

e) Keying line

If a transmitter is operated together with the receiver,

( See Dwg.4 .9 .5 )

a) Energization

Operate the power switch to " O n ” . Illumination of the
scale indicates the energized condition of the receiver; within about
one minute it is ready for operation. Its full frequency stability is
attained-'after about two hours of warmup.

b) Preparatory settings

With one of the twelve pushbuttons select the desired
band as a first step. Before tuning-in on the desired station, operate
the other controls as follows :

Operate the class-of-emission and bandwidth switch to "A1", "A2/A3"

”Narrow"or "A2/A3 Wide” corresponding to the desired class-of-emission.
Bring the control "RF Gain” to its zero position; this simultaneously
activates the automatic volume control (AVC). Operate the control for
the noise limiter to ’’O f f " . Turn on the loudspeaker by pushing the
audio control and set the latter for a medium volume*

c) Tuning in the bands 1 to 5

In these bands the frequency interpolator is inactive.

Tune the receiver with the control knob; in so doing set the scale in

dex directly to the desired frequency (control knob pulled : coarse

tuning; control knob pushed : fine tuning). Checking of the 100-kc/s

points aginst the built-in crystal spectrum is possible by pressing

the calibrating button; the red display ’’C a l i b r a t i o n ” becomes lighted
in such case. Set the main tuning control for zero beat. The deviation

between index and scale mark can so be determined and taken into ac

count in setting the desired frequency.

Check the tuning conditions against the * ’M a g i c-Efy· e - T u b ^ ’
In class-of-emission A1 set the control ”A1 Pitch" for the desired
pitch. To eliminate interfering noise the noise limiter can be acti

vated and set correspondingly.

Ε^ Π ELECTRONICS

■' 745Ea ■ ; r20 .·

| ^£M3Ew«t t cA{

d) Tuning in the bands 6 to 1 2

In all these bands the incremental fine scale with its

high reading accuracy can be used beside the main scale· This "Hetero

dyning frequency interpolator" is established by the tunable second
oscillator.

By reference to an example let us explain the setting

to a given frequency» A frequency 13,678 kc/s is assumed as desired.
Such setting requires only the following few operations :

- Press pushbutton 9 for the range 9700 to 15*300 kc/s.
Set the control "Tuning" in the coarse drive (knob pulled) to the

1 00-kc/s value of ths desired frequency, i.e. 13»600 kc/s·

- By pressing the pushbutton "Calibration" (red display "Calibration"
becomes lighted) and slow rotation of the knob "Tuning" in the fine
drive (knob pushed) make the beat note zero by reference to the crys
tal spectrum» The index of the incremental tuning scale may be in aay

position; it is of no influence onto the calibrating procedure.

Important i After releasing the pushbutton "Calibration” the index of

the main scale must no longer be shifted.

- By temporary pushing of the knob "Frequency Interpolator" (White dis
play "Frequency Interpolator" becomes lighted) activate the incremen

tal tuning action and set its control now for the tens and units,

(i.e. the figure· "78" in this case).

This leaves the receiver accurately tuned to the desi
red frequency 13,678 kc/s. The index of the interpolator scale need
not be set to "0" beforehand. The white display "Frequency Interpola

tor" indicates that any kilocycle value set on the fine scale has to
be added to the setting of the main scale in the bands 6 to \ 2 ,

Whenever a new frequency is being set, i.e. the knob .
"Tuning" is rotated or some other band selector button is pushed, the
"Frequency Interpolator" is automatically disconnected and the display
"Frequency Interpolator" becomes dark. The value just set on the in
cremental scale is new inconsequential.

q ) ■ Setting for, the olasses-~of—emission

(See Dwg.4*9-5)

The position without AVC, i.e. with activated control

"RF Gain" will be used, for instance, only if the received radio sig
nals show slow lading or noneat all* Stations whose signals hardly are
above the interfering noise can be better received with manual control,

for in case of automatic control large noise peaks, are liable to shut

down the receiver gain. \ '

By activating the control "Noise Limiting" su c h noise

peaks can be w i d e l y ..suppressed. This control must be so set that the

V

]

a

SAIT

ELECTRONICS

745Ea

_ . -1-* - ■

2V ·

a
a
a

a
a

a

useful signal is passed without distortion,

- Class-of-emission A1
Before -tuning in on an A1-station, "bring the index of the

control "A1 Pitch" to a vertical upward position, hence between the
two tapering arrow ends» With the main scale, and, if applicable, the
incremental scale, tune the receiver to the station in a way that the
frequency of the beat note becomes virtually zero (dead interval be
tween audible beats). Subsequently adjust the control "A1 Pitch" for

the desired pitch,

- Class-of-emission F1-Manual Morse
Operate the class-of-emission switch to "A1"*

Before the tuning procedure itself the index of the con

trol "A1 Pitch" must point upward. Adjust the RF gain with the control

"Gain RF",

With the aid of the main scale and, if need arises, incre

mental scale tune the receiver to the transmitting station in a way

that the lower of the two shifted carrier positions is associated with

zero be^at,

During reception adjust the pitch control or the incremen

tal scale in a way that, if possible, only the mark elements are audi
ble and the space elements are silent due to the zero beat method.

m

~ Classes—of—emission A2_and A3

Corresponding to the demanded bandwith'operate the class-

of—emission switch to "A2/A3 Narrow" or "A2/A3 Wide",

In these classes-of-emission the control "A1 Pitch" is in

effective,

• 7*~ MAINTENANCE

7.1 - CLEANING^ SERVICING,^SUPERVISING^ ‘ .
Since the all-wave receiver is built for rough conditions

of use, it needs servicing only at intervals of about 2 to 3 months
under normal climatic environment and in dry operating rooms. Equip
ment permanently used in vehicles or under adverse climatic conditions

•should be serviced about every four weeks. The intervals stated do not

for the indicating lamp "Frequency Interpolator" and the crystal oscil

lator (see paragraphs 4 *7 -1 „e and 4 -7 »2 )

Generally the following is required :
k) Cleaning the receiver inside and outside including servicing of the

surfaces, ' , ·.· ' i" . . ·-" .

lb) Servicing the.bearing points onrotating parts.

SAIT

c) Cleaning and servicing of exposed contacts (power switch and class-

d) Supervision of the operating voltage and tubes

e) Supervision of the indicating, scale, and protective lamps.
Important : Check the lamp lighting the display ''Frequency Interpola- ,

protected by paint against coming loose. For replacing lamps the hold

ers can be galled off the holding brackets in the direction of the

lamp exis.

personnel,· observing the demands applying for fine mechanical equip
ment. Permissible tools are dry washed lintfree cloths, clean brushes
with positively attached bristles, grease-free compreased air at a
precessure not exceeding 1 at (14 Ibsi) and satisfactory screwdrivers,

pliers and pincers.

ELECTRONICS

of emission switch)

(See table, Dwg.4*9·)

_ ^.or„ ^aily, possible. When the frequency interpolator

is activited, the display indicates by lighting that in
the short-wave bands 6 to 12 the numerical values of the
incremental scale, in kilocycles are to be added xo the
frequency getting of the main scalej satisfactory perfor
mances of this indicating lamp thus is of extreme impor

tance .
The indicating and scale lamps have screw bases and are

All work must be carried out with care by well (trained

Near coils including adjusting screws, variable capacitors,
trimmers, ans switch springs maximum care must, be exercised in order
to avoid mistune of frequency-determining parts.

Only a bare minimum of grease and oil should be used; as
a rule "too little" will be preferable to "too much". Use always only
best grease and oil free of resin and acid.

The tables in the annexed Fig.5 and Dwg,4*9-3 include all
necessary information for supervision of the tubes and .the operating
voltage and for the measurement of the gain per stage.

If a tube should show deviations of more than 10$ from the

Value stated, it must be checked in a tube tester; Should it pass that

test, check whether the circuitry around the respective tube has de

veloped a fault.

7*2- CHECKING_TSE_CRYSTAL_03CILLATOR

At regular intervals of about four weeks the frequency of

the crystal oscillator must be compared against a standard frequency.

For this purpose withdraw the slide—in chassis from the casing after

• loosening the four screws at the corners of the front panel, and pla
ce the chassis into operation again with antenna connected. (Caution :

Receiver is under operating voltage). Tune the receiver subsequently-

SAIT

t&dMMC A·

in band 3 to the station·Broitwioh I at 200 kc/s. Activate the crystal

spectrum generator with the pushbutton at the rear of the chassis.

ted from the crystal harmonics heterodyne to give a beat note. As a
first step set the main tuning control of the receiver approximately
to aero beat. The ordinarily small difference between the second har
monic of the crystal and the standard frequency of the transmitter is

evident from a beat note indicated by the magic-eye tube. Minimize the

beat frequency by varying the pulling trimmer on the crystal spectrum

generator (lettered ?'100-kc/s Cal.Freq.”) (minimum pulsation period
about 2 to 3 sec.)

the control MCal. Oscillator level'* inside the set. It must be checked
in particular in the shortwave bands with the highest numbers.

the casing and bolt it in position.

ELECTRONICS

The 100-kc/s wave of the crystal and the IF wave genera

The, volume of the 100-kc/s beat notes can be varied with

After checking and aligning reinsert the chassis into

7.3 ~ REM° VING_T^_FR0NT_PANEL_
To gain access with repair work to those components that

are controlled from the front (e.g. potentiometers, pushbuttons, power

switch), the front panel must be removed.

After loosening their tops all controls can be pulled

off easily ; only in the case cf the knob driving the index of the ■

main scale it is requisite to proceed according to the following

instruction (Dwg,4’9«2> Fig* O

1- Place the receiver with front panel facing upward.
2- Turn the knob in a way that access is gained to one after the other

of the two grub screws (l) in the slot (2) of the ring. Loosen the

grub screws.
3- Grip and withdraw the slipped-on protective cover (3) with finger

nails or pocket knife.

4- Push the knob to the rear position.

5-· Screw out the tapered-head screw (4 )*

6- Pull off the knob slowly and gently from the driving axle. If it

should refuse to come off smoothly, open the grub screws about another

quarter turn.

After repair and reapplication of the front panel and
the other controls reassemble the main tuning control knob in the
following order : ■

1- Place the receiver with front panel facing upward*.
2- Slip the knob onto the driving axle

SAIT

3- Turn the knob in a way that the two grub screws (l) become accessi
ble one after the otherj tighten the screws.

4~ Push the knob to the rear position,
5— Screw the tapered-head screw (4 ) into the axle.
6— Slip the cover (3 ) onto the control.

7*4 ~ REPLACING PARTS

1. Notes on mounting work

served :

a- To avoid connecting- errdrs, it is advisable before taking down a de

fective part or larger structural unit, to draw a situation plan of
the wires and components that must be unsoldered.

ELECTRONICS

In replacing defective parts the following should be ob

b~ Screws loosened for repair must be tightened again firmly after re

pair and protected against coming loose.

c- If need arises for replacing parts, use if possible only original

parts and mount and. fix them in accurately the same position.

By reference to the annexed photographs in Fig.1 resistors and capa
citors can be easily located, and by reference to the annexed Fig.4
coils, switches, relays and lead—trough capacitors.

Replacing a coil or a trimmer in the pushbutton assembly

Unsolder the connections to the respective pushbutton

strip. After bending up the fastening tabs, take out the strip and

replace the coil or the trimmer. Proceed with care and avoid jamming.

3* Dismounting of the pushbutton assembly with variable oapacitor C~

102/0-132/0-135. "

a— Connect an RF generator of constant frequency to the receiver input

and tune the receiver. Set the frequency in a way that the grub

screws on the axle of the variable capacitor are accessible in this

■position of the index. Mark in a suitable manner the positions of
the variable capacitor and the index, and loosen the connection be
tween the variable capacitor and the gearing system.

V

In reassembling set the index, the gearing unit, and the variable
capacitor to the aforementioned frequency and tighten the.grub
screws. Using the 100-kc/s crystal spectrum check the agreement
between the· positions of variable capacitor and index.

b— Unsolder and take down the bracket with the antenna jacks and the

antenna relay K-101.

0? - -

SAIT

^edtWHteTj

e- Open the connections between crystal spectrum and. push out tor» assem

bly and taken down the box with the crystal spectrum generator.

d~ Unsolder the shielded line to the converter,

e~ Unsolder the cableform connections to the pushbutton assembly.

rf- Unscrew the clips of the power cable from the pushbutton assembly.

g- Loosen the seven fastening screws and take down the pushbutton as

sembly plus variable capacitor,

h- In reassembling proceed,in the reverse order.

4= Replacing the relays

place it (adjustments on relay contacts are permissible only according
to special instructions and with suitable tools and measuring facili

ties),

ELECTRONICS

• If a relay should fail or give poor performance, re

;7·5 ~ AlilGMENT

1 filter and narrow-band double-tuned filter T— ^OQ/

L-310 (IF2, 100 kc/s) ’ ” "

Preparation :
a- Unscrew both shielding baffles from the pushbutton assembly (T3 to

T12). Unsolder the capacitor'C-130.(250 μ μ ΐ ) from the pushbutton
assembly. Connect the signal generator via the capacitor C-130 to
grid 3 of ¥104 (3 R<51). Disconnect the first oscillator by unsolde
ring the anode resistor R-122 from the lead-trough capacitor C-139·.

After the alignment restore the device to the original condition.

b- As a detector in the aligning procedure connect the RF tube voltme-

" t e r via 0,5 μ μΐ to the soldering-lug 5 of L-310.

c- Set the receiver to band 3 or 5,

I

Measuring instruments required :

Frequency meter from 1 to 2 mc/s

Signal generator from 10 kc/s to 30 mc/s (Zj= 60 Ω)

RF tube voltmeter 0«5 to 2 v

DC tube voltmeter 1 to 5 v.

d- Open the RF gain control (R-320) all the way.

e~ Set the signal generator accurately to 100 kc/s (check with fre-

quency meter or 100—kc/s crystal) and during the aligning procedure'*.

SAIT

Alignment procedure :

switch align the filters without additional damping several times in

. succession for maximum detector voltage (L-309, L-310, L-310, k~301,

L-302, L-304, L-305).
2, Double-tuned filter 1QSpl/l0Sp2 (100 kc/s)»'

preparation 1

a- Proceed as under 1*1; 1*3» 1-4» 1*5*
b- Connect the RF tube voltmeter via .5 μμί* to soldering lug 5 of

c— Prepare a damping network (1000 μμί with 5^0 Ω in parallel).

ELECTRONICS

always readjust for a detector voltage of 0,1 v.

In the position "A2/A3 Narrow” of the class-of-emission

L-308 as a detector in the aligning procedure,

Alignment procedure :

Operate the class-of-emission switch to position ”A 2 / A 3

Narrow” ; damp down L*~307 (terminals 2 and 1) and adjust L—308 for

maximum detector indication (core below the chassis)

L- . 3 07 for maximum deflection (core above the chassis).

3* Beat-frequency oscillator (BFQ for class A 1 )
Preparation . . ■
a- Proceed as under 4-7*5 “ c and cl·.

b~ Turn the control ”A1 Pitch” on its axle until the index at the

left stop points towards the end of the left-hand arrow; screw the
knob in position and turn the pitch control subsequently to the
mid-position between the arrows.

c- Set the signal generator accurately to 100 kc/s (check with fre

quency meter or 100-kc/s crystal).

Alignment procedure ; .

BF0 with L-311 for aero beat in headphone or loudspeaker.

>

• Subsequently damp down L—308 (terminals 5 and 6) and aligi

In position ”A1 ” of the class-of-emission switch align the

Gheck ϊ The pitch at the counterclockwise stop shall about equal that

at the clockwise stop.

4 . Filter L-201 /L-204 (50 kc/s); >-203 (1Q0 kc/sj

An alignment is only possible after the alignment under 1.

M ELECTRONICS

'Preparation

a- proceed as under 4·7·5~ 1ai ^ an<^ d··

b~ Operate the class-of-emission switch to position "A2/A3 Narrow",

c- Set the receiver to hand 1 or 2.
d- In aligning always adjust the signal generator with an input signal

of 5 0 kc/s (100 kc/s) for a detector voltage of 0.1 v.

Alignment procedure :

a,™ At 50 kc/s align L-201 and L-204 for maxim-on detector voltage.
b- At 100 kc/s align L-203 for minimum detector voltage.

Shuttle several times between the procedures (a) and (b)* until no
further aligning with L-201, L-204, L-203 is possible,

f.745Sa ·

: 271

5. Second oscillator 1280 kc/s (1280 to, f l 8 akc/s)
Effect the alignment only after a warmup of about two

hours. In aligning do not remove, the shielding plate or else detuning
will oc,cur.

Preparation

a- Connect the frequency meter via about 5 to anode of the tube

V202 (6 R<51) (soldering-lug 2 of L-301).

b- Set the receiver to band 6 (or 7 to 12).

Alignment procedure

Turn on the frequency interpolator (second oscillator
tunable).
a- With the index in position 100 kc/s adjust L-209 for: the oscillator

frequency 1180 kc/s.

b- With the index in position 0 kc/s adjust the trimmer C-232 to the

oscillator frequency 1280 kc/s.

Shuttle between the procedures (a) and (b) until no further alignment

with L-209 and C-232 is possible.

c- Turn off the frequency interpolator (second oscillator is fixed).

The index position is inconsequential. With the trimmer C-233
adjust to the oscillator frequency 128 0 kc/s.

6. Variable intermediate frequency (.1.1.80 to 1080 kc/s) and fixed inter-
... mediate frequency (1180 kc/sj ·

An alignment is only possible if the IF2 filters and the

.second oscillator.are aligned. In the aligning procedure do not remove

g j y ELECTRONICS

1 Efo ritwu eA.|

'the shielding plate or else detuning will occur.

Preparation ;

a— Proceed as under 4»7»5 ~ 1a » ^ a31^ · &·
b— Set the receiver for band 6 (or 7 12).
c— In the aligning procedure always adjust the 1080~kc/s or 1180-kc/s

input signal for a detector voltage of 0.1 v. .

Alignment procedure : '

Activate the frequency interpolator (IF1 variable).

a- In the position "100 kc/fe” of the index and with a signal generator

frequency of 1080 kc/s adjust L-2 0 5 and L-206 for maximum detector-
voltage.

b- In the position "0 kc/s” of the index and for a signal generator

frequency of 11 8 Ό kc/s adjust C-215 and C-218 for .maximum detector
voltage.

Shuttle several times between the procedures (a) and (b) above, until
an alignment of L^205, L-206, C-215 and C-218 is no longer possible.

c- Turn off the frequency interpolator (IF1 fixed)· index position ar

bitrary.

At the signal generator frequency 1180 kc/s adjust C-216 and C—219

several times in succession for maximum detector voltage.

7- First heterodying oscillator · /

Align only after a warmup of about two hours.

Preparation :

a- Screw the shielding plate firmly in position. Check the tube shield

ing cap for firm seat.

b- No backlash is permissible between the driving axle and the varia

ble capacitor. Check the take-up of the gears and the firm seat of

the fastening screws on the axle·

c~ Check the adjustment of the index. ’W h e n the plates of the variable -

capacitor are enmeshed 1 5 °, the index must be on the second marking

line from the upper right-hand scale edge. A 15"“d.egree gauge is

supplied with a replacement capacitor. At the right-hand and left-

hand stops of the gearing unit the index must be equally away from

. the end division in each case.

Alignment procedure ;

Begin with band 12, subsequently check band 11, etc ·,

i

>

m

m

m

m

SAIT

to 1 or align them, as the case may be* Align the oscillator at the ‘

right-hand end of the scale with the trimmer C 5·«·> &t the left-hand

end of the scale with coil h 5··. in a way that the scale calibration

holds ac curat e3.y (check against the built-in 100—kc/s calibrating

oscillator).

Caution : Beware from aligning to the image frequency in the bands 9

a- Check with a frequency meter whether the oscillator frequency is

b- Set the index to the input frequency. Set the signal generator to

ELECTRONICS

to 12* Check with method (a) or (b).

the sum of input frequency plus first intermediate frequency.

the image frequency, i.e. the input frequency plus two times the
intermediate frequency and connect it to the receiver input. Upon,
application of a sufficiently high input voltage it must be possi
ble to receive the image frequency; if such is not the case, the

oscillator is misaligned (input frequency less intermediate fre
quency). In such case turn out the trimming core and effect a
realignment.

m

8, Iff wavetraps

-Preparation j
a— Set the RF gain control R—320 for —3 v at the AVC line. Measure

with DC tube voltmeter, connecting ”+” to chassis ground and

to the white wire at the lead-through capacitor C-243 (lead-in to
the shielding box, variable IF)*

b- Tuning indication with DC tube voltmeter; connecting M+,f to chas

sis ground and n to R—331 ( 51 ^ kQ, at the right-hand rear, viewed
from the front panel, below the chassis in the corner; clamp the
lead to the point where brown and green wires leave).'

c- In the bands 1 to 6 connect the signal generator to the input via

the CCIR dummy antenna (Dwg.4*9-2, Fig. 6).

In the bands 7 to 12 connect the signal generator via 15 Ω resistor
to input (Dwg*4«9*2, Fig. 7)·

Alignment procedure :

In band 2 set the receiver to 90 kc/s and the signal

generator to 50 kc/s. Align the coil L-551 for minimum voltage indi

cation. .· .

In band 3 set the receiver to 180 kc/s and the signal
generator to 100 kc/s. Align the coil Ir-526 for minimum voltage i n d i 
cation. In band 6 set the receiver to 1.52 mc/s (coarse scale).

I a- Activate the frequency interpolator and set it to +70Jcc/s (i-e*

^ _.-]·}-jo kc/s); set the signal .generator to 1110 kc/s. Align the

m y ELECTRONICS

coil for minimum voltage' indication.

b~ Activate the frequency intrpolatoi* and set it to +30 kc/s; operate

the signal generator to 1150 kc/s. Align the' coil L--525 for mini

mum detector voltage,

9 - Input circuits and interstage circuits
Preparation :
a~ Proceed as under 8a? 8b, 8c, The lids of the pushbutton assembly

must be closed,

b~* In the bands 6 to 12 activate at each aligning point the frequency

intermolator and set thp index to:the mid-position (+5 0 kc/s).

7.6 - ALIGNMENT OF FREQUENCIES FOR TRACKING

Inductive alignment with

Band

1

2 9 0 ?0 kc/sd

3

4

5
6

7
8

9

10

coarse scale setting and

input- frequency

; 14*5 kc/s

176,0 kc/s

362,0 kc/s

745,0 kc/s

1.5 8 mc/s

3.25 mc/s 6 .Ο5 mc/s

6.2 me/s

10*0 mc/s

15 -0 mc/s

Capacitive alignment with
coarse scale setting and

input frequency

20.5 kc/s

16 5 r0 kc/s

335-0 kc/s

685 .Ο kc/s

1450.0 kc/s

3.02 mc/s

9.8 mc/s

14«7 mc/s

19 -9 roc/s

11 20.0 mc/s

12 2 5* 0 mc/s

Caution : In aligning the input and interstage circuits a correct

core position is of primary importance. The following table
gives guiding values for the . core position in millimeters

24.7 mc/s

2 9* 7 mc/s

SAIT

£fcd*a»ttcA.

7*7 - GUIDING VALUES FOR THE CORE POSITIONS

ELECTRONICS

above the coil body (+} or down in the coil body (-).

Band

1

2

3

4

5

6

7 ;

>

8 ;

9

1 0

1 1 L-5 2 2 1+2

Input circuit Interstage circuit

L-502i +2 L-528 1 - 7

"" ' . 1 t

L- 5 041 -8.5

L- 5 06 f - 1 5
L-508M 6

L-510l-i6.5

L-5l2|-5

, L—5^4}+3*5

L-5161-1.5

■..

I

L-518i+3

L—520 ! *+2.5

i

!

I

I .......

.

....

L-530 | - 7 .5
L-532* , -6

.

L-534 1 -16 L-555 j -4.5
L-536 1 -5
L-538 1 -6

........

L-5 4 O ! -4

L-542 | -6

L-544 ! -1
L-546 1 - 1 . 5 L-561 1 -3
L-5 4 8 1 -2

j

,1 .

""1 ..>

First oscillatcr

\

.

...

.

L-552 1 -3

L-553 1 -3

L-554 1 -3

L-556 1 -2. 5

L-557 1 »3-5

L-558 1 -4

L-559 ' -2.5
ir-560 1 -1 .1 .

L-562 | -3-

t .

I

i

1

1 2 "

.........

Alignment :

'stage circuits for maximum voltage reading at the prescribed alignment

of frequencies in the corresponding band; a capacitive adjustment
should be the last in each case of alignment. The order in which the

-bands are aligned is inconsequential. After alignment secure the coil
pores and trimmers'against rotation.

L-524J-1.

With the coils and the trimmers align the input and inter-

L-550 1 -4

-----------

1

-------------------

L-563 '| -1 .5

Fault

Receiver remains dead
despite application of
power

No reception in any
band

Probable cause

Fuse blown

a. Ballast resistor defec

tive, oscillator recei
ves no heating coltage

b. Relay K.101 fails to

restore

c. Tube V.105a (4 Ro1) is

defective

d. Lamp 1-102 is defective

Tracking down and

detecting the fault
Check voltage adjuster anc

fuse

a. Check-ballast resistor

for continuity

b. Check K.101

c. Check tube V.105a

(4 R01)

d. Check 1-102

Fault elimination

Set the correct mains

voltage and insert

fuses.

a. Replace the unit, if

defective

b* Replace the unit, if

defective; clean the
contacts of the cali
brating pushbutton

o. Replace the unit, if

defective

d. Replace the unit,

if defective

—J

cx>

I

w

I o

i tel
IM
,1

H

Q

m
Γ"
m

O
Ή

*5

o
z

δ

</>

In the bands 6 to 12
rotation of the main
tuning control activa
tes and inactivates
the frequency inter
polator temporarily

Frequency interpolator

fails to be automati
cally inactivated with

turning of the main
tuning control

Control contact on the
axle of the frequency
interpolator fails

Take-along switch on the

main driving exle fails

By-pass control contact

Remove front panel and

check switching contacts

Clean the contact and
adjust it properly

Clean the switching con
tacts and replace the
lead-in Litz wire, if

need arises

«7 0 0

m m m m m

Reoeption in the "bands 6

to 12, hut pressing and
turning of the frequency
interpolator knob fails

to change the frequency

.incrementally. The lamp

frequency interpolator

"On” remains dark

In all bands-and classes-

of-emission settings re
ception is weak and dis
torted; limiter fails to

operate.

No calibrating heats are

audible when the calibrat
ing button is pressed

The relays K«203 and K,20|
fail

Limiter blocks because of
defective electrolytic

capacitor 0*356

a.Incorrect setting of

the output coupling fror

the crystal spectrum

b.Calibrating crystal

defective

c.Tube V103 (2 Ro1 d e f ec

tive

a.The lead-trough capa

citors C.224 &n<i C.225

' must"'be at +10V. with

respect to chassis

.ground. If such is not

the case, one or both
capacitors have a fault
to chassis ground

b.Check the momentary

contact T6-12 in the
pushbutton assembly for
proper performance

The voltage across capaci

tor C.356 be 40 V.

a.Check whether heterody

ning beats are lacking
in the higher bands

b.Check whether calibrat

c. Check tube V103(2 R*<51)

only

ing beats are lacking
in all bands

a.Replace the capacitors

C.224 and C.225, de
fective

T

b.Readjust the momentary

contact

- Replace the defective
components C.35^ an(3·
R.345·

a.Turn the setting poten

tiometer at the rear of
the crystal spectrum ge

nerator for maximum

volume of the calibrat
ing beat notes

b.Replace the calibrating

crystal

c.Replace tube V103(2R<51)

ELE CT RO NIC S I 745Ea

u>
OJ

In class of emission A1
on/off-keyed carriers
cannot "be made audible
with the pitch control

Bands 1 and 2 show poor

sensitivity

Bands 1 to 5 show poor

sensivity

Stage 11, BFO fails

a.Relay K.202 fails

b .Tube V..201 (5 Ro1) de

fective

I 5^1 defective

a «Measure the supply volt

ages of ¥,305a(l1 Ro1)
and V 3I5*> (11 RB2)

b.Check K 201

a.Check the contacts b-^

and b^wit h actuation
of the band pushbuttons

b.Check tube ¥.201 (5 Rol'

Disassemble I 59^ an<i

check for DC continuity

a,If the anode voltage is

missing repair switch
SW 303b

b eReplace K»201 if defec

tive

a. Replace relay K.202

b. Replace tube V»20l(5R*dl

Interrupted: Replace I

501

in

1

>
H

I

m

r-

m

Ο

-4

Ο

ζ
ο

No reception in the hands

1 and 2j the other hands

are in order

Equipment output remains

dead hut magie-eye tube
operates

<■,

a. Relay K.202 fails to

be energized

b. Gontact fault on relay

K; 201

a. In class A1:tube ¥.3053

(11 R<32) defective

b. In class of emission

A2/A3 : tube V.303b

(10 R<52) defective

a.Energize relay K.202

via a t'est cord from
C .230.If this eliminates

the fault it is due to
the pushbuttons 1 and 2
of the assembly

b.Check the contact sets

of relay K.201 for con
tinuity

a,Receiver operates in

classes A2/A3 · ·

b.Receiver operates in

class A1

a. clean contact slide

and look for proper
adjustment

b. Replace relay K.202

or K.201

a. Replace tube V.305b

(11 RS2)

b. Replace V.303b(l0 R82)

ECT R O N IC S I 745®a

Class-of-emission switch
at A1/A3. Equipment output
remains dead, magic-eye

tube does not operate,
but lights*

Switch S.305 on poten

tiometer R.320 defective

Receiver operates only

with manual control

%

Replace potentiometer

R,320

ui

ELECTRONICS

8,- COMPONENTS LIST

8.1 - INPUT SECTION (STAGES 1-2- 3 AND 4 )
(1) References on diagram 4°9*4'

(2) References marked on components.

' '745Ea

References

/ Λ \ / ^ \

0 ) (2)

STAGE 1_

C 500 1 C34

c 501
e 502

c 503
c 504
c 505

C 2

c 3
c 4

0 5

c 506 c 6

C 507

C 7 .

c 508 C 8

c 509
c 510

C 9

C10

c 511 C11
c 512 012

C 5 1 3

C 514
c 515
c 516

C13

C14
C15

C16

c 517 C17
c 518

c 519
c 520

c 521
c 522

c 523
c 524

C18
C19
C20 Plastic

C21

C22

C23

C24

c 525 C25
c 526

c 527

C 528

C26
C27

C28

Descripti on

Plastic

Air Dielectric

;V

Foil Capa-

citor
Trimmer

It It
if
II
It

11 tl

If

11 ; t!

*» >
1! ,

It
It

Plastic Foil

citor

Ceramic Capacitor

tt
II If

it
II

It

Foil Capa— IQOOpF +2,5$ 125V.

citor

tt !l
If
11

It

II
It 11
tl
II

Value Remarks

170 pF
25'PF

tl

16 pF

It

It

It

II

It II
It
It tt
It

It

16 pF

If

16 pF

tl

16 pF

tf

16 pF

II

25 pF

if

25 PF

25 pF

t;

25 PP
25 pF·

tt

25 pF

Capa- 70 pF +2,5$ 125V,

15 pF Sirutit 10

II

tl
It
tt

tt
It

II

. >·

tt
II II

15 pF Rd D 50 2.51°

50 pF Konstit 100 $

50 pF Rd D 20 7$

50 pF Rd D 20 2$
20 pF Rd D 20 2$

II

700 pF +2.51o 125V. ;

It

200 pF +2.5$ 125V.

If

140 pF +2.5$ 125V.

II

It

80 pF +2.5$ 125V.

ft

20 pF +1 pF '125V0

ft ‘ II t i 

tl

ll 11 it

25 pF +2.5?° ' "

82753/25EV alvo(l)

82753/16m alvo(V)

11 II II
tl If II
If tt II
If II tl · ..

82753/25EV alvo(l)

ft II It
II It It
II It 11
II II It

II It tl

DN 70/ 2. 5/125B310

Sad I5/O .4/ 7OOB37I '
Stettner (2 )

Rd 50/2/250-2x16

B 3714.

Stettner 25OV. (2 )

it tt
It tt

DN 1000/2.5/125B

3101 ·

DN 700/2.5/125B

3101

DN 200/2*5/125B

3101

DN 140/2.5/125B

3101

DN 80/2.5/125B.

3101

DN 20/ 1 /125B3101

II It tt
If It ft

DN 25/ 2.5/I 25B3101

CTH ELECTRONICS

l&SedtoKieA-l

•745Ea

|,3T ;

C 5 2 9 '

c 5 3 0 1
c 5 31 1

c 532·,

C 533,

C29

1

C30
G31
C32

C33

«

C 101 1
O

C39

OJ

O

040

I

C 103*

C41

1

G 1 0 4 1 1C43

R 1 01 1 W 1

L 500 t
L 501-,

L 502,

L28
L1

L2
L 503 , L3
L 504 I

L 505 i

L 5 0 6 i
L 507

L 508

L 509

|l 5 10

L 511
L 5 1 2

L4

.'L5

L6
L7

L8

L9
L10
L11
L12

L 513

L 514
L 515 L15

L 516

L 517
L 518

i LI 8

L 519 i L19
L 520 i L20

L 521

L 522
L 523
L 524
L 525

L 526

L 101
I 101

I 102

1 L21

t L22
' L23
! L24
1 L25

1

1 L26

1

1 L27

1 LA1

, LA2

Elastic Foil Capa- 2

citor

ΤΙ π 11

1» 1» '1 c

I

Ueramic Capacitor
Plastic Foil Capa

citor

Soldering Lead-

trough capacitor

3 Gang Variable Ca

pacitor

Plastic Foil Capa

citor

Metallized-Paper

Capacitor

Carbon-film Resistox

.Antenna Coil I
Preselector Coil I

Antenna Coil II

Preselector Coil II
Antenna Coil III

Preselector Coil III

Antenna Coil.IV
Preselector Coil IV
Antenna Coil V
Preselector Coil V

Antenna Coil VI
Preselector Coil VI

Antenna Coil VII

LI 3

Preselector Coil VI.

L14

Antenna Coil VIII
Preselector Coil VCI.

L16

Antenna Coil IX

L17

Preselector Coil IX
Antenna Coil X

Preselector Coil X
Antenna Coil XI .

Preselector Coil XI
Antenna Coil XII *
Preselector Coil XI
Wavetrap coil

1130 kc/s ■ ■

Wavetrap coil ,

100 kc/s

Heater choke

Pilot lamp
Protective lamp

!5 pF +2.5$ 125V.

60 pF +2.5i -125V. )

)0 pF + 2.5$ 125V.

Sirutit 10

5 pF

00 pF +2 ,5% 500V

'2500/35OV.

250 pF 1 Paket

250 pF/2.5i 500V.

jiF 200 V»

0.1

56Ο KQ 10fo 0.5».

Funk bv empf/115

»1

t!

IT

tt

fl

11

t!

It

It

SI

it

m ” U2

” " U3

» . " U4

n t» U5

tt tt XJ6

tt It υγ

n « U8

tt tt U9

tt n · xj^jc

tt it U11

• h tt XJ1S

I

tl

tt

tt It tt XJ3<

It I» u i

” « U4<

7V 0.3-A. ;

40V 10/Elektromobi

m 25/2 .5/1 25B3 1 Q

n 160/2 .5/1252310.1
BN90/2 .5/ 12 5 B3101

Sad 5/0.4/700B3757

BN 1 00/2 .5/500B3101

Buko 2500/350B

3705

C002 BC/3x250E

Valvo

EN/250/2.5/500B

3101

6 ko mpd 843

.aaB26l 1

SBT Vitrohm (3)

J

9

/ _ \

0sram( 4 ) ^ * 3341

Osram' 634OBA 20d 1

SAIT ELECTRONICS

I 501
K 10 1 Re1A
V 101

V 102

STAGE 2

c 105
c 106
c 10 7

c 10 8

G 109
C 110

G 111

C 112

G 113 cio
c 10 0

R 102 R 1
R 103

R 104
R 105
R 106

R 107

v 103 T 1

XTAL

101

LA3

T1 Input tube
R2

C J
C 2

C 3

C 5
C 6

C 7 Plastic Foil Capa
C 8

c 9

C11

R 2
R 3

R 4
R 5

R 6

Q 1

Protective lamp 260/220¥ 10 /7

Antenna Relay

Protective neon gap

Ceramic Capacitor

It _ II
tl If

Plastic Foil Capa

citor

Ceramic Capacitor,

citor

Tubular Trimmer
Soldering Lead-tro^

Capacitor

• I II II
tl - II II

Carbon ^Film Resistoi

ft / If It
11 ' II 11

11 11 tt
π II 11

Setting Potentiometei
Calibrating Oscil

lator Tube

Control Crystal

Trls.15 1 y
EF 93/ 6BA6

10 8 ci/ob 2

Sad 1 pF +0.4pF Βϋ±
Sad 0.5 pF/20^ Elit

8000 pF +20fo 250V.

80 pF/2»5$ /500 V,
40 pF Rd D 20 2/o

50 pF/2 .5 / 1 2 5 V.

VK 122 ME

C3/60 VK 64023

. 2500 pF 350 V,

II If 11

II II II

1 .2ΚΏ 1 ($ 0 .5 w

68 ΚΏ 10$ 0 .5 w

100 KQ .1 Ofo 0.5 W

68 ΚΩ 10$ 0.5 W

390 ΚΩ 10$ 0.5 W

10 m lin 0,2 W

EF 93/6BA6

100 kc/s

Osram BZM E 14
PBV 650l8/74d
Siemens

11

B 3711
B 3711 700 V.

SKR 16/8000D

3000 St(2)

EN 80/2.5/500

B3101

Stettner 250 V (2 )

DN 50/2.5/125VB

3101

Valvo:. (1 )

Duko 2500/350B3705

n 11 η
11 11 11

SBT Vitrohm (3 )

11 rt it

tl t« If

Vitrohm (3 )

tt 11

LN 100 Ruwido (6)
Siemens

itel BV 673 R 8

STAG

E 3

G 534

" 535
3 536

c 537
C 538

c 539
c 540

c 541
C 5 42 c 9
0 543

c 54 4
c 545

G 546

C 1

C 2

C 3 16 pF

C 4

c 5

C 6
C 7

C 8

C10
C11
C12

C13

Air-dielectric

Trimmer

II II
II ft
Π 11
II ft

It 11

II II

Plastic Foil Capa-

• citor

25 pF

16 pF

16 pF
16 pF

1 6 pF
25 PF

25 pF

25 pF
25 pF

25 pF
25 PF

90 pF +2.5% 125 V. DBF 90/2 .5/ 1 25VB ·

32753/25E Valvo (1;
32753/16E Valvo (1)

I! 11 II

It 11 11
II II II
Mil Η II

8275 3 /25E Valvo (1 ;

II It 11
11 11 II
11 tl II
π n tt
11 11 II

3101 ;·

SAIT

I j

745Ea 39

C 547 ! C 14.

»

C 548 I C15

G 549 1 C16

c 550

c 551

G 552

C 553 , C20

C 554 I C21
c 555 i C22

C 556 1 C23

G 557 1 C24
C 558 *'C25

C 559 ‘ C26
C 560 1 C27

C 562 1 C29

c 115 | 031

C 116 I 032
C 117 i 033

G 118 i C34

G 17

C18

C19

561 ! C28

114 ‘ 030

' I

1

I

119 1 035

120 ' 036

121 1 C37

12 2 1 C38

123 ‘ C39

1 24 } 040

C 125 j 041

12 6

, 042

127 1 C43

C 128 1 C44

1

c 129 I C45

C 13 0 * C46

. I

C 13 1 1 047

C 132 j C 48

Ceramic Capacitor

Plastic Foil Capa-

. citor

tl II

Metallized Paper

Capacitor

Ceramic Capacitor

Matellized Paper

Capacitor
Gsramc Capacitor
Ceramic Soldering

lead-trough Capa

citor

!! H *'

Ceramic Capacitor

Metallized Paper

Capacitor

tt »i >t

Platic Foil Capacitor

3 gang variable

• - Capacitor .

15 pF Sirutit

20 pF + 2.5fo SKR 12

50 pF + 0.4pF R£

Konstit
50 pF +2fo 1)20 Rd2fo
40 pF +2f D20 Rd21
20 pF +2fo D20 Rd2$

1000pF +2.5$ Ί25 V.

Sad 15 /0 .4/700B

3717

Sad 20/ 2 .5/70 0

D50 Stettner (2 )

50/0.4/500 B 3714

250V,Stettner (2 )

DN1000/2.5/125B

3101

700 pF +2.5$ 125 V.
200 pF + 2 .5% 125 V.

140 pF +2.5$ 125 V.

' 80 pF +2,5$ 125 V.

20 pF + 1' pF 125V.

25 pF +2.5$ 125 V. BN25/2.5/125B3101

0.1 μΡ 250V.Sicatrq?

Sad 160 pF 500 V.

Sihatit

D.1 μF250V.Sicatrop

3000 pF +20fo 25 Ο V.

2500 pF 350 V.

3000 pF 20fo 250 V.

3.1 μΡ 200V.6 kompd

II tt tt

250 pF 2 .5$ 125 V.

40 pF 2.5fo 125 V.
(2nd.Capsection

(contained in C102

DM700/2 o / l 2533501
DN200/2.5/'25B3O1

M l 40/2.5/1 25B3D1
DN80/2.5/125B3101

DN20/i/i25B3101

0.1/250V.B2530

Sad 160/500B3721

0.1/250V.B2530

SKR l6/8000pF/D3®

B 3705

SKR 16/8000 D300O

843 aa B 2611

m 250/2 .5/1 25 B

3101

D N 4 0 /2 .5 /125B 3 1 0 1
V a lv o ( 1 )

(2)

T45Eai

'40

I S I t U K K I V I

0 563 I 049 ■?

O

r>i"

(1. A \

C50 s

i

062

C64

C65

<-*1 r- > /*·

( * ‘*s V' ■ ! ■'

R 1 | G

R 3 1

j

R 4 !

R 5
R 6
R 7

R 8
R 9

RIO

IR1 2

HI 3
K16

R17
R18

R 4

R14
R15

L 1 Ai

. L 2

c 133 I

0 138 I

0

c ' 141 !

U ^ q. *

c 13/j 1

R 503 !

R 108 1R 2 I

R 109

R 110

r i n

R 112

R Vi 3
R 114

Ft 115

R 116
R. 117

R 118
R 119

R 120
R 121

R 124
R 126

R 127

L 527
L 528

14 0 pF +2 ,5$ 500 V.

citor

2f?00 pF 350 V.

t

·■· PF ilxrrrhi.t 10

I 0 1 }iF200V . Kortvpd

or

i} X - L U 1

tt

!(
I!

<· ·: jjYj

1 '">(.) ΚΩ
12 ΚΏ

1 ΚΩ

56Ο ΚΩ

220 KQ

12 KQ

56Ο ΚΩ

100 ΚΩ
100 KQ

22 KQ
12 ΚΩ

12 KQ
1 ΚΩ

100 KQ
100 ΚΩ

24 ΚΩ

24 KQ

Funk b v em f« 115U15

O/o O.S

ICfc

10%

0*

1
10$
10$
20$
10$
10$
10$

10$

10$

10$

10$

10$

10$

r~

0, j

0 ,5

0 .5

1

o„5
o»5

0 .5

0 ,5
0 ,5

0*5

0 ,5

0 = 5

0 .5

1. 0

1.0

DN 14 0/2 .5/500B

B 3705

Sad 5/0 ,4 /7 0 0 2 3 7 17

843 aa B 2011
SBT Vitrchin (3)

w

w

ABT

w '

SBT

¥

w
w
w
w

w

W

w
w

w
w

w
w
w
w

11

tt

:ABT

SBT

tl

tl
1!

If

*?

tl

5!

It

11

ft

3101

L 529
L 530

L 531
L 53?

L 533
L .534

L 535

L 536
L 537

L 538 I.L12

I* 539
L 540

L 541

L -542

1 L 3 A:
I L 4

i L·; 5 i

i L 6

1 L 7 i

, L 8

1 L 9 ^

. I
1 LI 0

}

1 L11 A

, L13 A

1 L14

1 L15 A

1 L16

X

ode Coil)

Grid Ceil)

e Coil)

Grid Coil)

.node Coil)

Grid Coil)

node Coil)

Grid Coil)

.node Goil)

Grid Coil)

I I

III

IV

VI

VII

» VIII

« f! TJ16

ft . H U 1 7

Μ H U18

H " "" U 19

V

« π U20

•II It 0 2 1

ti »< U22

L

SAIT

I

I
I
I

1

1

L 543
L 54 4

L 54 5
L 546

L 547

L 548

L 549

L 550
L 551

L 10 2
V 10 4

STAGE 4

L 1 7

L18

L I 9
L2 0

L2 1
L22

L23
L24

L25

L26

T 1

Anode Coil)Interm.

Grid Coil)CirouitI2

Anode Coil)

Grid Coil)

.Anode Coil)

Grid Coil)

Anode Coil)

Grid Coil)
100 Kc/s Wave trap

50 Kc/s

Heater choke

1st .Mixer Tube

X

XI

XII

Funk bv empf,115U23

" " U24

.1 M U25

II M U2 6

ti 11 · U 14

• 11 » U39

EK 90/6 ΒΕβ

■745Ea

Siemens

.41

1

*

«
<

«

a

■
i

Λ

c 565

c 1

566 C 2

56 7

C 568

c 569 C 5

c 570

c 571

0 572

0 5 73
C 5 74
c 5 75

3 576

3 5 7 7 C 1 3

3 57 8
3 579

3 580

3 581
3 582
3 56 3
^ 584

3 585

3 586

3 58 7

5 588

3 589
3 590

3 591
^ 592

3 593

C 3

C -4

C '6
C 7

C 8

c 9

C 10

C 11
C 1 2

C 14
C 15

016

C 1 7

C 18

C 19

C20
C21

C22

C23
C24
C25

C26

C27
C28

C29

Air Dielectric’Trimar 25 pi1

Plastic Foil Capa

citor

Ceramic Capacitor

If tt

25 PF ·

tt
I!
!t

16 pF
25 PF '

n
It
tl
tt
tt

16 pF

440pF+2.5$ 125 ¥.
637PF " "

603pF »' M DN603/ "

1 71 pF "

2645pF '» "
490pF ” "
986pF " n .
615PF n "

570pF " "

184pF " "

125pF " "

71 pF " "

500pF " M

10 pF+ 21pF 125 V.

15 pF+ 21pF 125 V. D N 15 /V 1 2 5B 3101

25pF+0.4pF Sirutit
15pF+ " "

82753/25E Valvo(l;

It tt Π

tt tt It
It tt tt

827 5 3/1 6E "
827 5 3/25 E "

ti n tt

tt tl tt
It tl ft
tt It tt
It ft It

82753/ 1 6s Valvo (1)

DN440/2.5/125B3D1

DM637/ " "

DN1 71 / " 1f
DN2645/” ”

DN490/ " "
DN986 " "

DN615 " · "
DN570 " ”

DN1 84 ” "
DN125 " " ·

DN71,2/” "
DH490 11 "
DN10/1/125B 3101

Sad 25/0.4/700Β37^ί
Sad 15/ " ■ 11

m

745Sa

42

3 594 |

σ 595 !
G 596 j

G 597 i
C 59 8 1

c 599 «

C30 G

C31

C32
033

C34
C35

\

G 600 J036
G 601 1 037
C 602 5
G 603 1

G 604 !

G 605 ,
C 606 j

038

039

C40
C41

042

G 607 |C43

0 608

G 609

G 610
C 611

044

045
G46

047

C 6 12 1 C48

C 613

0 6 14

G 615
c 616

C49
C50

051
C52

c 6 17 | 053

G 618

; 054

eramic Capacitor

. II

tt
tt
tt

It
?t
It

It

3lastic Foil Capa

citor

Ii

II
!!
t!

tl :
tt
t!
11

tt
tl

tl

• II
;n

' tt

1!
II

It

tt

Ceramic

H ”

(i *!

It n
It tt
tl , ' ■<

II Ί
tt *t
tt it

ti tt ;
tt f

It t!
tt tt

tt tt
tt 51
it It

tl it
I) tl

?! »*

Oapacit or

25pP +0.5pP Rd/D45

;νμ ι ι / j. ~

>0pF +2i TM/D2Q

20 pF

100 pF

30 pF

50 pF

40 pF
30 pF

25 pF

20 pF + 1 pF 125V

16 pF + 1 pF 125V

10 pF + 1 pF 125V
25 pF +2 .5P? 125V

15 pF + 0 .4 S iruttt

250V Stettner (2 )

Ed 65/2/250

3x20 B 3714

250V Stettner (2 )

II Μ

it tr

DN1000/2·5/1 253

3101

DN 500/ " " "

ON 360/ "
DN 140/ "

I)N 120/ "
DN 100/ 11
DN 80/ "

DN' 50/ ”

40/ "

BN

30/ "

m

DN

25/ "

20/l/l25 B3101

ON

16/1/125 "

DN

IO/1 / 1 2 5 ”

DN
DN

25/2 .5/” "

It H

tl f!

It tt

5* It
U M

t? It

Ii t!

S1 ?t

15/0.4/700

10 Sad B3717

c 6 19 105 5
C 620

C 621
G 622

C 135

10 5 6

j 057

\ 058

1
1 C59

1

C 136 1 C60

j

c 137
c 139

C 14 2

C 143

R 121
R 122

R 123

R 506

! C61 ·
! C63

! G66

i

*

i vo (
J R 1

1 R 2
1 R 3

‘Η 5

R 507 , R 6

Plastic

Ceramic

3 Gang Variable

Foil Capacib.

u

Capacitor

t* t!

Capacitor

Soldering Lead-

trough Capacitor

II
p

1? η

M · ·

Metallized Paper

Capacitor

tt

Carbon

tl
II

II

II

1! II

film resist0

It K
It tt

It »

II »

12 pF +1 pF 125 V.
10 pF +1 pF 125 V.

15 pF +0.4P?

Sirutit Sad

Ivd. Gap section

contained in C102

0.01 pF 200 V

22 ΚΩ 1Crf o 0 ,5 W.
470 Ω " n

20 ΚΩ " ' "
220 Q " ' "

2.2ΚΏ " 51

DN 12/1/125 B3101
DN 10/1 / 1 2 5 B3V01

I5/O.4/7OO B 3717

B 3705

II

ti

6 kompd843 aaB26l1

tr »!

SBT Vitrohm (3 )

tl

II t«

tl tl

tl

tt 11

■

■

SAIT

££mIw 0c4,|

R 125

■745Ea

R 7 Carbon film resistoi 20 KQ 10% 0.5W . SBT Vitrohm ( 3)

43

■

3JJH

*
m

*
*

■

L 552
L 553
L 554
L 555
L 556
L 557

L 558 L 7

L 559
L 560

L 561

L 56 2

L 563

L 103

V105a

V105h

8.2 - FREQUENCY CONVERTER SECTION (STAGES 5 -· 6 AND 7 )

L 1
L 2
L 3
L 4
L 5

L 6

.L 8

L 9

L10

1 . 1 1 " 11 XI

L12

L13

T1 )
T2 )

(f) References on diagram 4*9-4
(2) References marked, on components.

Osc, Coil I

tl 11 H

11 " III

' " " IV

n it y

11 V I If II I I U32

tl 1! V II

» VIII
" IX

" " X

" ' ” XII

Heater choke

1 st. Os0 .Tube SCC8 2 /12 AU7

F m k "bv.enipf .115W

Η 1! If U28

II II II U29

II 11 If U 3 0

II It 11 U31

” " U33
π if t. g34

II t l t l U 3 5

If 1 1 I f ■ U 3 6

π ti 11 XJ37

II u ( I U 3 0

11 it ft U39

Siemens

■
M

i

■

|jw

H

References

(1) (2)

STAGE 5

C 201 ! C 1

C

202 •C 2

C

203

C

204

C

205

C 206 C 66

207

c

c. 20 8 C 10

c
c 2 1 0 C1 2
c

C'3

c 4

C 5

7

8

c 9

209 C11

2 1 1 C 1 3

Description

Ceramic Soldering

lead-t rough.

capacitor

II II I» !»

Paper Capacitor

Plastic Foil Capa

citor

II II II

11 fi ii

Paper Capacitor-

Ceramic Soldering

Lead-trough

capacitor

id.
id.
id.

Value

2500 p F 350 V .

11 it

0 .0 1 μΡ 250 V .

1 0 00pF+2. jf o 125 V .

IOO O O p F+2 ,5^ 125 V .

1000PP+ 2.5 ^ 125 v .

0 .1 μ ί 25 0 V ,

2500 p F 350 V .

2500 p F '35 0 V.

Remarks

Diiko2500/350B375

Kf 310/2 Roeder-

stein ( 5)

DN1000/2.5/125B

3101

DN10000/ " " "
DN1000/ " » ”

I<F 410/2 Roeder-

stein ( 5)

Duko 2 3®/ 3 50B3705

It I I If II

It i ! . I I · II

It II If II

■745Ea

44

R 201 R 1 C

R 202 R 2
R 203 R 3

R 204 R 4

L 201 L 1

L 202 L 2 C
L 203 L 3 j
L 204 L 4

K 201 . ReIC

K 202 Re1B

V 201 T 1

STAGE 6

G 2 1 2 C l

G 213 0 2

C 214 0 3
C 2 15 0 4

G 2 1 6 C 5

G 217 0 6
C 218 C 7

c 2 19 0 8

C 220 C 9

C 221 010

C 222 011

G 223 012

G 22 4 0 12

C 225' 0 14

C 226 C15
C 221 016

C 228 C17

G 229 018
c 230 0 19

arbon Film Resistor 1 Ki

tt tt tt tt

tt tt It 829

tt tt tt 6 8

st .Circuit )50Kc/s

z' O

Funk by ernpf 115M1

JoipLing Cdl)filter

00 Kc/s Wavetrap "

2nd.Circuit 50 Kc/s H

_ filter ~ ·,

_i? — Rea. ay -1

It <* '

50 Kc/s IF-tube , EK

i

Plastic Foil Capa- 20

citor

paper Capacitor 0.

rGang variable Capa- jl s

Citor 0

Air Dlelectr .Trammer 2

It tt tt

3 Gang Variable 2n

Capacitor cc

Air Meleotr .Tsmrner

11 tt Π

Plastic Foil Capa- 2C

citor

Paper Capacitor 0

Plastic Foil Capa— 5

citor

Paper Capacitor 0

Ceramic Soldering 2

.Lead-trough Capa

citor

,, t t ’ tl ”

U 1! · »t '«

Plastic Foil Capa- ϋ

citor

Ceramic Soldering

Lead-trough

Capacitor

„ t l tt tt

„ tt « 11

η π
it η

It t!

If !!

I5iy

>5 pF

tl

SBT Vitrohm (3)

π.

115 M2

r»5M3

PBv 65018/74*3-

tl

tt tt

Siemens

D N 20/1/125B3101

K f 310/2 Roeder-

stein (5)

\Talvo (1)

32753/25E Valvo(l)

DN 20/1/125 B 3101

if 310/2 Roeder-

stein (5 )

DN 50/l/l25 B 3101

if 310/2 Roeder-

stein (5)

>iko2500/350B3705

3N 50/2.5/125B3101

3uko2500/350B3705

SAIT

lEfcetnwaeAj

745Ea

45

R 205 R. 1
R 206

R

207
R 208
R 209

R 2
R 3

R 4

R 5

. 7

L 2058 L 1
L

206 L 2

L

20 7

L

208

K

203

K

204
V 202

L 3
L 4

RdE
RSD

Rc5172nd. Mixer Tube

STAGE

C

231,

c 232·

G
C

C

c 1 3 Gang Variable

C 2

c 3

233

C 4

234

c 5

235

C 236 C 6
C

237

C 7

C 238 c 8

c

239

c

240

c

241

G

24 2

C

243

C

244

C

245

C

247

C

248

C 9
C10

C11

C14
G15

C16
C17

C19
C20

Carbon Film Resistor

m

ft tf " tl

11 t ! ft

ft tl . Tl

1 ΜΩ + 10J& 0.5 W. SBT Vitrohm (3)
150Ω " "

27KQ » »

6.8ΚΩ 11 ·'.· "

27ΚΩ »' "

6

Anode Coil)variable Funk by empf 115M4

Grid Coil )lF-filter " " . " 115M5

Coupling Coil

*! tf

Relay

f. ft if

tl tt ft If

Trls 15 ly TBv 650l8/74d

Relay Tris 1 5iy /

EK 9 0 /6 BE 6 Siemens

is contained in C

Capacitor 3rd.Cap.

Air Dielectric Trim

25 PF 82753/25E Valvo(1)

214

mer

11 I t It

Ceramic Capacitor.
Plastic Foil Capa

tt ft tf fi it

50 pF 2$ 250 V. RdD20/st ettner (2)
500 pF +2.5$ 125V.

citor

tl ft tl

tt ft fl

Ceramic Soldering-

500 pF +2.5$ 125V.

100 pF. + 2.5fo 1 2 5 V.
2500 pF 350 V. Duko 2500/350

Lead-trough Capacit.

It It n

Plastic Coil Capacii
Paper Capacitor

Ceramic Soldering

It ft ff ft It

5 pF + 1 pF 500 V.

0.1 μΡ 250 V.

2500 pF 350 V. Duko 25ΟΟ/35Ο

Lead—trough Capacit.

If If 11
tf tf ft
tt tt it

1

Paper Capacitor
Ceramic Capacitor

tt tt
ft Tl

1600 pF 250 V.

0.05 \i¥ 125 V. -
10 pF ΊΟ/ο 250 V.

it π ·

ft I I

tt 11

It tt

TBv 650 18/74d

m 500/2 .5 /12 5

B 3101

DN 500/2.5/125

B 3101

DN 100/2.5/125

B 3101

B 3 705

DN 5/1/500 3101
Kf 410/2 Roeder-

stein (5 )

B 3705

I» It !l

If fl II

Bypass 1600/250B

370'

Kf 3 5 0 /1 Roeder-

stein (5 )

Rd Elit B 3712

745Ea

46

1

R 210 ,
R 211 j

R 1

R 2
R 212 1 R 3
R 213 1

L 209 |

R 4

L 1
L 210 ,L 2
L 211

V 203a‘T 1

V 203b1

T 2

1201 LA1
SW201

8 ,3 - MFLIFIER_SEGTI0'N-___(STAGES^8__~__9_-_10 — - i3_and_14)

Carbon Film Resistor

j? it » | W /

J? I I 1?

11 If 1 1

Oscillator Coil II
Anode choke

L 3

Kathode choke

2nd <.0 sc. Tube
0sc«and buffer stage,

Indicating lamp for

S1 2

frequency inter-polat

100 ΚΩ +10$ 0 .5W.
220 ΚΩ +1C$ 0.5W.

1 ΚΏ + 10$ 0.5».
10 ΚΩ + 10$ 0.5W.

Funk bv empf 115M6

tt ti 115 M7

11 it 1)

ECC82/12AU7

7V/0.3A

•

SBT Vitrohm (3 )

ti It

ft π

tl ft

Siemens

Osram L.Nr 3341(4)

(1) References on diagram 4*9»4*

: (2 ) References marked on components.

C30 1 } C 1

1

C 30 2*0 2

G 30 3 j C 3

R 301iR 1

R 302* R 2
R 3 0 3 1 R 3

i

v 301, T 1

Paper Capacitor

)

1! ' tl

Π M

Carbon Film Resistor

M If π

H t ! II

IF amp1.tube for A1

0 .025/250V oMinityp

85

0.005/250V. " "

0 .1 / 1 2 5 V. ' 0

1 ΚΩ + 10$ 0.5 w.
68 ΚΩ + 10$ 0.5W.

150 ΚΩ + 10$ 0.5W.

EF 93/6BA6

Kf 325/2 Roeder-

stein (5 )

Kf 2 5 0 / 2 ”
Kf 4 1 0 /1 11

SBT Vitrohm (3)

Siemens

STAGS 9

G 305iC 2

j

G 306ΊC 3

1

■C 4

G 3071c 5

i

C 30 8 IC 6

0 309Jc 7

C 3 10 J C 8

t

G 31-1 |C 9

C 312IC10

Plastic Foil Capacit

Paper Capacitor

,500 pF 2.5$ 125 ¥

500 pF 2.5$ 500 V

500 pF 2*5$ 500 V.

0.03 μF 2.5$ 125 V.

0 .0 1 6 μ¥ 2 .5$ 125 V.

500 pF + 2.9$125V.

0.025 μΡ 12 5 V
Minityp 85

0,1 μΡ 125 V. id.

m 500/2 .5/1 25B

310 1

BN 500/2.5/500B "

310 1

DN 500/2.5/500B

310 1

HNO.03/2.5/125B

3107

M O . 016/2.5/125B

3101

m 500/ 2 .5/ 1 2 5B

310 1

Kf 3 2 5 /1 Roeder-

stein (5 )

Kf. 410/1 · " :

SAIT

313

31 4-

R 304
R 305

R 306
R 307

R 308
R 309

h 301

L 302

303

304

L 305

L 306
SW301a

SW30n
SW302aj

G11

C12

R 1

R 2

R 3
R 4
R 5

R 6

L 1
L 2

L 3

L 4

L 5

L 6
S') a

STb

S2a
SW302tj S2b
SW304a, S4a

Paper Capacitor

Plastic Foil Capa

citor

Carbon film Resistr

Anode Coil )
Circuit Coil II )

Coupling Coil l/ll)

Circuit Coil III )

Grid Coil '

Coupling Coil ΊΠ ./Έ )
Bandwidthswitch 1cbk

”■ 1 st deck
" 2nd »

« 2nd «
!l 4th

0.05 μΡ 250V. id.

100 pF 2.3 % 125 V.

22 ΚΩ + *10$ 0.5 W.

15 0 ΚΏ + 1 Ci f, 0 .5 W.
1 m ± % 0 .5 w.
1 ΜΩ +. % 0 .5 W.

22 Ω + 10$ 0.5 W.
22 Ω + 1C^ 0.5 W.

Funk by empf 115V.1

Funk by empf 115V.2

Range switch A9

Μ I I

<745Ea

47...

£f 35^/2 Roeder-

stein (5 )

DN 100/2.5/125 B

. 3101

SBT Vitrohm (3 )

(
^4 Kreisfilter

(

(

Pa, Mayr. (7)

!T It

11 tl
ft tl

II

»t

jv 302 1 T

i

STAGE 1_0_

315 I 0 1

I

I

316

Ί C

I c

317

1

318 1 C 4

1

319 1 C 6
320

1 C 7

1 C 8

321

1 C 9

322

! C10

323

, G1 1

324

! C12

325

l

326

I C13

1 Cl 4

.,327

J

_______

IP ampf.tube for

A2/A3

Paper Capacitor

Plastic Foil Capa

citor

Paper Capacitor .

i.

Plastic Foil Capa

citor

tl M 11

Paper Capacitor

Plastic Foil Capa»

citor

Paper Capacitor

EF 93/6 BA 6

5000pP 250V M%>8 5

0.025/250V » «

600/2 .5f 12 5 V.
0 .0 2 5 pf 1 2 5 V.":,»

600 pP 2.5$ 125 V.

10 0 pp 2 .5$ 12 5 V.

300 pP " »
300 pP ,f "

0.01 μΡ 125 V.

300 pP 2.5$ 125 V.

0.05/125 V.Minityp

85

0 .5 / 1 2 5 V.. " "

0.01/125 V. » "

Siemens

Kf 250/2 Roeder- .

stein (5 )

ft II II

DN 660/2 .5 / 1 2 5

B 3101

Kf 325/1 Roeder

■ stein (5 )

DN 6ΟΟ/2 .5/1 25B

3101

DN 100/ " ” "
DN 300/ » » "
DN 300/ ” " «
Kf 310/1 Roeder-

stein (5 )

m 300/ 2 .5 / 12 5 B

3101

Kf 35 0/V Roeder-

stein (5 )
Kf 4 5 0 /1 «
Kf 3 1 0 /1 »

745Ea 4δ

328

lci5
ι

Ici6

329
330

,017
4 Cl 8

331

i

it 310 R 1

3 311

3 . 312

} 313

ϊ 314

3. 315^ iR 6

* 316

ϊ 317

^ 3 1 8

* 319

1 320

1 32 1

X 322

1 323

3. 324
* 325 ,

t
I

I

R 2

Jr 3

fR 4
iR 5

|R 7

I R 8

IR 9

1R1 0

JR11

1R1 2

1 R13

'.R14

,R15

. R16

R 326 |R17

R 327 Ρ1δ
R 328 £19

R 329 iR20
R 330 iR21

R 331 SR22
R 359 1R23

L 307 |L 1

L 308 ,L 2
SW303a S3a

Electrolytic Capa

citor

Paper Capacitor

H It Π

Plastic Foil Capa

citor

(3 )

I!

If

If

1t
II
If

If

11

If

11

II
11
If

tl

II

11

tl

' tl

11

tt

11

fl

. 11

11

potentiometer
Carbon Film R«

sistoi

Potentiometer
Potentiometer

Carbon Film Resistor

11

II
It
II

If
II

II

It

Bandfilter Coil A $ .

tl tt

Class of emission)

switch 3rd deck )

25 μΡ 35 V

Elko 25 μϊ1 35 V

B 4177-1

O.I/I25 Y.Minityp85KX 410/1 Roeder-

stein (5)

300 pF 2.5^ 125 V»

i m ± ic$ o»5 w,

tt

t<

tt

11

It

tl

tl

11

tl

neg.log.6

1 Cyfo 0 .5

SI

2.2ΚΏ

56 ΟΚΩ

51 ΚΏ
330KQ

150ΚΏ

39 KQ,
820ΚΩ

1 ΚΩ
100ΚΏ

100ΚΩ

10ΚΏ +

100ΚΩ "

ΜΏ pos.
?„2ΚΏ + 1<
t m "

100 ΚΩ "

5 1 ΚΩ "

150 ΚΏ "

1 KQ 11
220 ΚΏ "
510 ΚΩ "

5*6 ΚΩ n

It

11

!f

n

It

tt

It

tt

log.

ffo 0-5 W.

DN 300/2.5/125B

SBT Vitrohm (3)

It
tl

It

If

11

1!
tl

11

11

11

Funk empf 115T 22^

SBT Vitrohm (5 )

ft 1»

Funk empf

SBT Vitrohm (3)

11

u

If

tl

tl

tl

t!
tl

II

ft

It

tl

tt
tt

It
tt

^Funk bv empf 115V!

A 9

Fa. Mayr (7 )

3101

fl

tl

tt
tl

It

11

11

It

tf

tl

tl

<1

II
tf

tt.

it

SW304d S4d

ι

SW305 1 s 5

1

V 303ε* T 1
V 303b T 2

V

304^

T 3

STAGE 11

c 332, c 1

Class of emission)

switch 4*k d.eck )

AVC diode . )

Deiaod. A2/A3 ; )
AF~stage -

paper Capacitor

A 9

EB 91 /6A1 5 ·

ECC82/12 AUT

0 .0 2 5 μΡ .250 v,

Fa. Mayr (7 )

Siemens

Siemens.

Kf 325/2 Roeder-

stein (3) ..

STAGS 1.1

c

332

0 1

c

c
c

c 336
c

c 338

c
c
c

c

c

c
c

c
c

c 348

c

G
R

R

R
R
R 336
R
R 338
R
R

R 341

R

c 2 Plastio Foil Capacitor

333

C 3

334

C 4

335

c 5

C 6

337

C 7 Paper Capacitor

C 8

339
340

C 9 Plastic Foil Capacitor

C10

341
342 C11

C12

343

344 C13

C14 Ceramio Soldering

345

346

C15

C16

347

C17
C18

349

C19

350

R 1

332

R 2

333

334 R 3

335

R 4
R 5

R 6

337

R 7
R 8

339
340

R 9
R10

342

R11

S¥303b S3b

Paper Capacitor

r? n rt

11 n iv

Paper Capaoitor
Ceramio Soldering

Lead-through Capaoitor

Electrolytic Capacitor
II II It

Yariable Capaoitor

Paper Capacitor
Ceramic disc Capacitor
Lead-through Capacitor

tt >C tt

Paper Capacitor

ir

Plastic Foil Capacitor
Paper Capacitor

Carbon Film Resistor
(V IS 18

es U yi

« n n
t? Jf 1 9
<v n tt

It 14 it

tt 11 tf

TV It tf
K fl If
II If If

Class of emission

switch 3rd deck

0.025 uF 250 V,
1000 pF 2.5$ 100 V.

500 pF 2.5^ 125 7.
500 pF 2.556 125 7.

0*025 uF 125 7.
2500 pF 250 7.

5000. p? 250 7.

4 uF 350 V.

100 pF 20 5$ 125 V.
150 pF 2a j f i 125 V.
100 pF AC

0 a 025 11F 125 V»
2,5pF 5007.± 0«4pF

2500 pF 35C V.
2500 pF 350 7.

5000 pF 250 7*

O0O25 uF 125V0

Minityp 85

1000 pF 2,57S 500 V*

0,025 uF 250 V.

2.2 kohm + 10# 0.5».
820 ohm ± 105» 0.5 ¥.
10 kohm ± 1Cψ 0.5 ¥„

2,7 kohm + 1035 0.5 ¥

100 kohm + 10$ 0,5 fl

33 kohm ±~10$ 0,5 W.
10 kohm ± 1056 0.5 V.

22 kohm ± 10^ 0.5 W.

4«7 kohm ± 10$ 0„5 ¥

1 Kohm ± 105& 0.5 ¥.

1 Kohm i -10$ 0.5 ¥,

A 9

745Ea

49

Kf 325/2 Boeder-
stein (3}

BN1000/2.5/500B3101
BN 500/2.5/125B3101
BN 500/2.5/125B3101
Kf 325/1 Roeder-
etein (5)
Buko 2500/350 B3705

Kf 250/2 fioeder-
etein (5)
Elko 4/350 B4371-5 S

BN 100/2. 5/125B3101
BN 150/2.5/125B3101
L.Nr«,210 Fa. Hopt (8)
Kf 325/1 Roeder-
etein (5)

SEE 2/2.5/B20 Stettner
Buko 2500/350 B3705

Buko 2500/350 B3705
Kf 250/2 Roeder-

stein (5)
Kf 325/j Roeder-
stein (5) ·

ΒΝ1000/2»5/500 B3101

Kf 325/2 Roeder-
stein (5)

SBT Yitrohm (3)

Fa. Mayr (?)

I» 309 L 1 Anode Coil}IF band-

L 310 L 2 Grid Coil )filter A1

L 311 I» 3 Grid Coil )Oso.coil

L 312 X» 4 Anode Coil ) A1
7 305a T 1 Mixer tube for A1)
7 305b T 2 Osc.tube for A1 }
V

306 T 3 Tuning indicator tube

Funk bv empf 115V 3

Funk bv empf 1157 4

ECC 82/12 AU?

EM 34/6 CD 7

Siemens

Siemens

745Ea 50

STAGS fg

C 351 C 1 Electrolytic Capacitor

C 352 C 2 Paper Capacitor
C 353 0 4 Electrolytic Capacitor

C 354 C 5 Paper Capacitor

0 355 C 6 Electrolytic Capacitor
C 356 C 7 Bleotroly ;ic Capacitor
S 343 R 1 Carbon Film Resistor

R 344 R 2 " "
R 345 R 3 M

R 346 R 4 Potentiometer
R 347 R 5 Carbon Film Resistor

R 348 R 6 ”
fi 349 R 7 M

R 350 R 8 ” ” "
R 351 R 9 "

R 352 R10 " V v
7 307a T 1 Boise limiting diode;

V 30Tb T 2 Boise limiting diode)

2 uF 3507.

0.025 uF 250V.

0.5 uF 350V. 385

0.025 uF 125 V.
2 uF 250 V.

2 u? 250 V.

100 kohm ± 10$ 0.5W.

100 kohm ± 10# 0.5^

10 kchm t W fo 0.5^

5 kohm lin 0,. 2 V.
68 kohm ± 10$> 0.5^

330 kohm ± 10/o 0.5W

56 kohm t. 105^ 0.5W

1 Mohjn ί 10J& 0.5W

2.2 kohm ± 10£ 0.5W

10 kohm — 10fo 0 ,y n

SB 91/6 AL 5

V 304b T 3 AF-stage contained

in V 304a

STAGE 13
C 35? C 1 Electrolytic Capacitor

C 358 C 2 Paper Capacitor
R 353 R 1 Carbon Film resistor

R 354 R 2 "
R 355 S 3 " "

R 356 R 4 "
R 357 R 5 "

V 308 T 1 Final stage tube

2 uF 350 V.

0.01 uF 250 V.
100 kohm ί 10^ 0.5^

10 kohm + 10^ 0.5^

330 kohm ± 10^ 0.5»
270 ohm ± \6fo 1 W.

51 kohm ±10$ 0.5W

EL 90/6 AQ 5

3S&GE 14

C 359 C 1 Paper Capaoitor

R 358 R 1 Carbon Film Resistor
R 359 R 2 "

R 360 R 3 M "
TR301 Tr.l Output transformer

LS301 Lspl Loudspeaker

5000 pF 1000 V.
560 ohm i I09S 0.5W

4.7 kohm ± 10# 2 W
5 ohm ± 2 *rf.
6 Zub Bv 714055/20

PM 95/19 CT Trop.

1732

Elko 2/350 B4371

Kf 325/2 Roeder

stein (5)
B 4371-1

Kf 325/1 Roeder-

stein (5)

Elko 2/250V.B4371-5

Elko 2/250V.B4371-5

SBT Vitrohm (3)
H II

»» ft

Funk empf 1 15 ^ 228

SBT Vitrohm (3)

II St
II 11

II It

I» »·

H It

Siemens

Elko 2/350 B 4371-5
Kf 310/2 Roeder-

stein (5)

SBT Vitrohm (3)

It M
II tl

ABT "
SBT "
Siemens

Kf 250/l0 Boeder-

stein (5)
SBT Vitrohm (3)

BBT ”

Zub wd 4c 41404

Kigo

[tfoetwieA-l

STAGE 15

Ϊ 401
I» 401

Tr1

I 3

Beet.401 Beotl
Beet .402

Beot.403

c 401

C 402
c 403

G 404
c 405

" 2

" 3

c 1
C 2

σ 3

c 4

C 5

C 406 C 6
I 401

Ϊ 402

LAI
LA2

I 403 LA3
Ϊ. 404 LA4

B 401

B 402
B 4p3

E 404

EW1 Osrara balast resistor

Th1
B 1

B 2

Si1

401
7 401 Bo1
ACCESSOBIES

r 401

Si1

745Ea

Power transformer 6 Zub.Bv 724 102/35/2468

Power ohok* .
Plat rectifiers

6 Zub.Bv 734 065/27/999

B 250 C -150 Trop.

Bectifier B 250 0 85 Trop.
Bectifier

E 15 C 250 Trop.

Electrolytic Capacitor 500 uF 12/15 V.

η h

« M

32 -v 32 uF 350 7.

contained in 0 402

Electrolytic Capacitor

ft ft

16 + 16 uF 350 7.

contained in C 404
Paper Capacitor :0.05 uF 500 7.

Scale lamp main scale 7 7. 0.3 A.

it t> II tt
tl Tt It IE
tt ft ft It

7 7. 0.3 A.
7 7. 0.3 A.
7 7. 0.3 A.

(double-ended tubular

form with "blade contact).

Thernewid Basistor

Wire wound resistor

A32 3/400 OB 1/600

4 kohm 4 Wo ± 10$

with clamp
Carbon film resistor 3,. 3 kohm 1 W ± 10$

Fuse for 220 V.AC
Stabilizer tube

Fuse for 110 7. AC

0.6 mar 41571

150 C2/0A 2

0*8 DUf 41571

51

Siemens
Siemens
Siemens .
Elko If 500/12
B 4101
B 4373-5

B 4373-5S

Kf 350/10 Boeder-
stein (5)

Osram (4)L.
Kr. 3341

tt tt

It It

tt tt

Caps Osram (4)

Siemens
Zub.wd.240g.

ABT 7itrohm (3)
Fa.Wiokmann (10)
Siemens

Fa..Wickmann (10)

ii*

Mm

Am -AMR

m-

fai

•i -V.i .v-;V.

' Rf StAGi ' M M M fim t

: ; ,EF93. ·.

1

/W»

• ΜΖ' Ι'ίΙ».·

.ffs?

t f t >

. . .

JF S m e IslMmSIAGi

: ■ E F93

f b f ►1

; CAL \0 $C

■ if 9 1

■ jsm i

r.i lo a m s ' cmmstr wha m

m mum mu main m i
m mm wim rmm/iNimuem

. ISd(S) .

1
| 1st OSC1 . ■ vt

1

1

:■ •A ‘ ca?

1

, ζΛ ..

1

i .
t

mi til M Si YW H Ml

I6 3 F SI

l
t

r

...

L

if a

m mixm sm i ' fum

nm

:;$\ws

Fig. 4 Functional circuit diagram for band 4

If!

sn m m m f.. ifm

mm mnjm

A:'AS avcwe

Ai s - A MPL

If2

fUS C

N

mmmom

wotjAmm .

im io m m s

tssisi

π

\ M0SC |

ww moms

. WH A M F ROM

motomws

mm

■ 4 W

h

r)

Aw A VC WS

I P

Jt

Am - D I M !

A i - A V C m

A znAVC VUS

A’ ■ DF M

mo m m
muMiw F/m sm

fKTfi? «4 Λ

» ϊ ί

tmmsAi s

AUDIO AMPtl f l FR
A NO UM t m F I NAL S JA 6F

ICC 82 IAA 91

»Ή

pA' J7 K8A L 5l

fl»

-

c>

16 A0 S>

a 90

-l

o

(SMSt

he

--

m

φ

I»

m f M

Fig. 5 Functional circuit diagram for bands 6 to 12

200mf 20 jH

1- L

i'/i-eoii

Fig.-$- CCiR dummy antenna .

— J—

Β0δ_

>ϊ > -Avc m m

Hi

w s m ist M m s m

£m

I6BA6*
CAl\0SC

. £F 93

.. 0

1 6 BA Cl

n x loo kc/s commsiy.wmf

rp s m ■ istM im s m m m p ijm m m

i f 33 .

[* 90

-

► !

1

16 BE 8)

1
11 si O SC 1 i

1 ψ ν

1
t
! !/
L

___

Λΐ;?Αϋ·)

ooubuf' ■ o m um m o m

sonc/s

Fig. 2 Functional circuit diagram for bands 1 and 2

• 2ndMlf Df

1 0G H C /S

Λ ’- Am-AMPi

(f93

SM6t

n

A i'i- D M l

Ai-AVCVhlB

Am-AVCVU6

AUMA M M M

m rn rn

[CC 82 EAA 91

fm sm

a x

cH ±

IBJHJ7 USAS'

AU DIO AMPUmH

A W 1 3M l M fiHAl STA6E

HAQS)

D>· '

=B

f P r .

(6 BAS! 1
CAl OS C ! Is

iF33

■

D>

l.

USA 6 . 1

wo m s m m o m w m ti

Fig. 3 Functional circuit diagram tor bands 3 and 5

Fig.7 Dummy antenna for the shortwave bands

Ai- AMPl

if 33

>

>6 BA 6 1

A.! ,■ 3 A v c m

-

At DEM

tCC82

[ » ^

UZAU7)

Drw. 4.9.2.

• ·ν ■

; · -y. - ν.:>·ί - ? · · ' . >

Fig. I Control knob for the Index of the mam scale

Nr

MODIFICATIONS

USED FOR

.S J lJ,T - r^ u r - S io A s T y p s . . '*£&>).

S-A u. T.CajasnJcs. Ty//> e / * £ . (.4:Sj£3)-

SVL/CJ7! Cazz-'i&teji. Z//> e 2... J .- 4 .ΛH i)

SJ[ J T. jC o riso J ’c-X -Tfe ? . A t£ C &

Date

Nr

DESIGNATION

Stock Nr

Main Rg c ei v e r

Control Knob and

Block nianrams of Receiving_BajTds_

Material

Drawn

€ .& . ώ'/

i tt aafl a a n v r ' Γ \Ί

Nbr.of pieces

Checked

Replaces

FILE n:

OWO.N*.

Replaced by

6 - 3 0 4

20. 9 2 1

Λ&Χ 'Ϊ :

W e h M ^ \ELEC-

§ε$ /6 Ν ::φ ΰ Ο Ε

TTUBEJ

W s z t

2 TUBEr

EE 93]

3 TUBE 1

EX 90

k TUBE 1

-EPC82

ME A S VAL UE Q

l Ik (3 .2 k)

ET 168 k ( > 10 0 M )

EJWk(>100M}

6 68k (> 100 M)

>10 0M

7 TUBE fit

ECC82

8 TUBE 1

EE93

Α1-ΑΪ13

9 TU B E l

EE 93.

AT-Α213

10 TU BE 1&

EB91

1 Ϊ T U B E 1/2

- ECC 8 2

AT-A 2/3

PIN MEASVALUEQ

>WO M

900k’22h

ITEM -·'
'DESIGN.

11TU8E3

IM S ’*

ID TUB E 3

12 TUBES

-ECC82

1 2 T UBE 7]^

ΈΒ91

13 TUBE 1

EL 90

MEAS VALUED

si !No,pushbuttonypr0Ssed, ET: Calibrating butt g rossed . . ‘ ,

MEAS VALUEV

y jU B E i
0 E 9 3 :>·}

J-TUBE I

fB JU B E t

W~TUBE' ;l
%ECE!82::

[SzW B Et.
iW s o t ;

■6 TUBE 7;

PIN. MEAS VALUE V

220(200)

7JU B E 1/2

• ECC82

8 TUBE 1

EE 93'

9 TUBE 1

' EE 93

10 TUBE m

EB91

11 TUBE 1/?

ECC82

MEAS VALUEV

11 TUBE 3

ξ'Μ3ϊ ;

10 TUBE 3

12 TUBE 3

EEC 82 .

12 TUBE J/P

EB9T

13 TUBE 7

EL 90

HEAT

REG

:'eh 90 ;

ra^; ίϊ"' Cl th ^ f RF ϊηρ^9

^ ^ I p ! : s i g n a 1 ί?ΐ··;·.: v ·; · ■ ■ ’·,··'.·'·* ’ ’ ;

A d * ' " '· < '/? , i ' · . ' ■> .

MODIFICATIONS Date Nr RESIGNATION

USED FOR

SJjJJ~-£azt3o fc i T fe r „Z * ,C .4 jd i»££3~l·'

y 4 r 7-/7' t -Γι'· fc * 7\/H~ ( ^ ^Sl i L L

slAJ?JZL&zasui/e*.-7%b * //& .£Λ-·'ϊΛ $ί-

Main

V Q l t a g g a n d R e s > i s f e n c g ^ ^ t U g ^

A-v^in; Trouble - S h o o t i^ M i

Material

Drawn

Nbr.of pieces

Checked

Replaces

'/M M l

4 1 irffeg.

Replaite^by^

W-

S?ffeW&flitf

W h
m m /
ι W 20t

W aI.

\

^ \-H

- \ L.

\

m is E c rm

— +-1

&?MC M

10 V DC

63 m

4150V RE6

—

4230 V

— **

- m v

— #►

0

CON VERT ER SECT ION

EB E5 E3

□

El

Ik

— 1 / T U a RELB

BAUDS 11:

50KC/S

i

^ — ► BANDS tANDSW 12:

t j 5

BANDkREl D/E

S T 1 . ..5 BANDS 1 T05:RElDIE

Mb

/

RELDiE

S11

$

JVNiVO MISSION JtiNIW lOUdlV S&W3-J0‘SSV13 MW .

NC

Power supply u nit .

Right-hand view of receiver chass is.

R507 C300 CSA6 R503 C53I W06

C 577

C589 C590 C578 C599 C 5S3

6-304

T R £01

'mm

ewwWK

TR 301 C 353 R245

Annexed Fig. 1

/V>. PP . 0 7 1

R 210

L 210

C 24 7

C 241

C 240

08

: 22\

R 21 2

r. τ 3:

C?o 6

κ?η

R 2)0

C7:'jr

7

CP 48

L2U

C??3
C 2 2 ’
R 205
C 220
R205

C 227

R20S
C 212

R 204

R 124

C 207

R 203

C 205

R 202

C 205

C 204

CiOb R 106 R 107 C 108 R 103 C203

R 334

C34 7/C33S

C 344
C343

6 -3 0 1

jr3

✓ firfa

R338

R 340

C 33Θ
C302

C 313

C339

C301
R 306

C 309

C 308

3C6/C307

R 301

H 304

R 303

• /

w

sfi

C332
C 303

R302

C323

C 327

C330

R 351/ R 35 0

C328 /C35 1

R 353
C35 8
C3 53/ C35 6

c* m

R.34 7
R3 45

C3 5 7

R 3 43

R 352
R3S 4

C 31 8

C314 R35QR305 C312 C3I6 Λ3Π C322 C33I R3IP/14 C3?0 R3I6

C31) C 315 R307 C350 R3I0 R322 R3 28 R315 C u b R318

Bottom view of receiver chassi s Annexed

R329

R330

R376 R 331

C533

C 532

C5 K

C 520

C 515

C525
C 52 6

C 516
C 521

C 5^2

C 51 7

C 527

C 518
C528

C 523

C52A

C 519
C 529

C 105
C 103

R 101
R 121

6-304

C 553

C 558

C 554
C 55 5

C 559

C 5GO

C 56!

C 116

C 562

C IK

C 104

R 123/ 12 5

R 118/ 119

C l23 ft 109 R 110

R1I6 R 126

R 111

R1KR115 C134 R 122

Input section

Annexed. Fig. 3.

m i s

m

%

m m

l l f e f i l i

« 8 msm,

m x U .......

. .

' '?·’■'' '■ '■'

.

M S IB S m M ··. :·: '■•■ifr·'-·

w m m m &

< 1

< 1
< i

:< 1
.3,5

;2>5·

p y ·;

10

' ■V; : -· '

;ν ΐ ;·'. · ' > , i··. , ;·:.

.^1/;V'.lOi||F-'93V'

. : ;·.''. ■· .'vi^fe ' - V· :· ' ', ■ - ’. - .

Fr e quenay'Volt.

■;"ό^τβ&

■ * « 1

• ‘ ■■? , '■ V-.C, '

,'τ;·1 ? 0 ^

.-; ν·27ό|

4 55 pl·

2400 ^

·:",490θί
Ϊ8400Ϊ;

13 0 0 0 ?

t e

i # |

^rfsT

Λ

lit t

A

» £

:Type;

ficps
i i f :

&&Kfc:K

I

ccin'

z c y m t

,C CIR _

P P | h |

i l l

I I P

^reiuene^·
" I N M ;

V

IK

v 'f - ’svV

eruia

Volt ivt

t w )

Jra;

13 <|

270·

iTifO;
I2400 '·

ιϊ V i* v' *·: ■' ·*

,’;■· , "A‘ - ': ';:'. ·’·.-,'

1 8 4Q0';
ii3obo

·· Limiter "Off";' full volume; HP mam

frequency' interpolator "Off"; signal gem

,Gf / V2Q1/EK-90

Frequency Volt.

(kc/a)

50

50

U O

HV

Cuv) ■

; ■· 3

■. 3

■; 6
7,

5 4'

6,5

v 10

G 3 / V 104 / EK 90,

Frequency·Volte

(μν)#·

18

I3O.

: 276

• 5 5 °

1160

2400
4900

.8400

13 0 0 0

55 0

•380

400

50

45 0

50.
50

60

70

25

25

a/ras,·

,·^

g g

S f i

M ' '

m

w m m

lift·

m

ι;7|οό
? 2 ? 0 0 : ;

2^300

^Measuring conditions: Noise limiter "Off"; full volume; coupling c

ν<φ· :-; **■'} v v 5-fi resistor, corresponding· to 3 mff into hes

ο ΐν e η ί:;: -1 ;

" n^coniroi^R323:.:';-'^

i-uencjr

w%.%

• ;>.Vqlt;ag

flip;

I S · -

w M M

\ 6 ;'

’"■7.".

:· i ': ·

'32.

Λ 7 TOO ' ; Λ

22700;

27 3 00 ■

r. ·.

^ 6

.; 7 . .

--'5 ■

17700

22700

273 0 0

0^/ V30Aa/ECC-8^

F r e q u e n c y

(c/s)

1000

70

65

65

Vlt

(m v

28

f

I l f ®

manual gain control off; RF voltages for audio output power ^0 mw S 0,5 7 acrosa * 0
generator 2^ « 60 Ω; coupling capacitor 10,000 μμί · .

90
Lt.

0 .

G3/V202/E

. Frequency

(kc/s)

5

5

-

- 1180

-

r

-

-
1180
1180
1180

1180

K*9Q

Volt.

(μν )

0,9

0,9

0,9
0,9
0,9

G-J / V 301/ε

Frequency

(kc/s)

100

K-93.

Volt.

(μ ν ).

0,8

Gj/V 30 2/E

Frequency

(kc/3)

IF 93 '$

Volt. .

( μν)

Notes :’. < ·

Bandwidth control at

HA1”; signal generator

* unmodulated?· BFO set . ·

•

100

-

~

- ' - ..

-

-

-

0,8

- 100

- 100

-

100
100

100
100 ·

100

40 v
40

.. 40

40 ■ 'V':v i;. ·^··
40
4 0 '
40

for about 1000 o/s S'·’

s

;ν·· .;·; ..‘- ν’.

Bandwidth control at; ,
"A2/A3 Narrow”, f , f :·

Signal · generator : ’· ·' ·
1000 o/s; 30 $ inodu-\!‘;«y}

lation ^ , /

’1

-

-
~ 1180

rig capacitor 0 ,1 μί; audio voltages f o r' 50 niw £ 0,5 v across' internal loudspeaker--dir

headphone jack with 10 ~kR load ·

1180
1180

Frequency

(o/s)·

1000

0,9
0,9

0,9

1 V304 b / ECOS2

-

-

Vltg

- 100 40

-

-

(nnr)

270

100
100

*

•40 ■

40 J

G, / V 308 / EL-90

Frequency

(c/s)

. -1000

i., ·· '

vitg

(nnr)

. : -i§QQ;·' [ '/ -' X

LE V EL . Pt AM Annexed Fig, 5