c) AM-IF Alignment 2 MHz
Alignment Sequence
Signal Generator
coupled to
Alignment Indication
Alignment
L 211
MP 202
Output Meter
(XII) Put Out
IF-Filter 7, 6 and 5
MP 202
(VIII), (IX) and (X) for maximum
IF-Filter 4
MP 201
(XI) for Maximum
L 211
MP 201
(XII) For Minimum
2. AM-Oscillator, Filter and Aerial Circuit Alignment
Band
Range
Oscillator
Aerial Circuit
Input sensitivity at 30%
modulation 400Hz 1W
Image
Rejection
Oscillator voltage in mV
pin 13/14 IC 401 or 201
6 db
26 db
1 W
db
LW
160 kHz
(1) Maximum
(3) Maximum
3,2
7
49
350
290 kHz
(2) Maximum
(4) Maximum
3
6,5
47
MW
560 kHz
(5) Maximum
(7) Maximum
0,6
1,2
53
320
1450 kHz
(6) Maximum
(8) Maximum
0.6
1,3
35
K 1
1,7 MHz
(9) Maximum
(11) Maximum
6,5
75
20
34
280 - 300
3,4 MHz
(10) Maximum
(12) Maximum
1,8
23
7
29
K 2
3,7 MHz
(13) Maximum
(15) Maximum
4,5
60
5
32
260 - 280
7,2 MHz
(14) Maximum
(16) Maximum
1,5
20
2
29
K 3
8 MHz
(17) Maximum
(19) Maximum
2
28
2,5
32
210 240
11,8 Mhz
(18) Maximum
(20) Maximum
1
16
2
28
K 4
13 MHz
(21) Maximum
(23) Maximum
2
24
3
36
220 - 250
17,8 MHz
(22) Maximum
(24) Maximum
1,5
18
3,5
27
K 5
18,7 MHz
(25) Maximum
(27) Maximum
1,5
24
4,5
27
220 - 240
23 MHz
(26) Maximum
(28) Maximum
1
16
3,5
23
K 6
24 MHz
(29) Maximum
(31) Maximum
1
16
3,5
27
210 - 230
27,6 MHz
(30) Maximum
(32) Maximum
1
16
4,5
20
Remarks: The order of the oscillator adjustment is arbitrary.
The ferrite antenna is installed in the order LW, then MW over frame
men (90 cm) matched. Sensitivity values at LW and MW in
mV, at KW in uV.
With the KW pre-circuit adjustment, the signal generarators over 20 pF
at the base of the telescopic antenna. Vibration voltage at the 2nd
oscillator (V1): 290 mV.
3. Adjustment of Field Strenght Meter on
AM
With the AM adjustment completed, adjust the reading on the meter
at f= 1.7 MHz (K 1) and an input voltage of 30 uV to “1” with R 514 and
at an input of 100mV "9" with R 512. The setting must be repeated at
least once.
4. Control of the 2
nd
oscillator in connection
with the counter
Feed in 6.200 MHz to K2 with approx.. 100uV at the base of the
telescopic antenna, ground St V 801
(4)
and set the receiver to 7.740
kHz with the tuning knob. At this frequency there must be maximum
deflection on reader, otherwise adjust with C 459 or L 405. After
removing the ground bridge, the counter must show 6.200 MHz
(tol2 kHz).
5. Adjustment of the SSB Section
Oscillator Alignment
Set BFO/SSB switch to off, "middle" position. On K2 at 7.2 MHz, with
a modulation frequency of around 400 Hz, adjust the receiver very
accuratelly for maximum reading either on the output meter at low
level or on the field-strength mater at higher level.
Set trimmer C 711
(36)
optically to center position. Set BFO/SSB
switch "down".
With the trimmer C 709
(38
)
not connected in circuit and the core of
the SSB-Variometer 19415-010.00
(37)
turned to the right side,
After locking the core, adjust accuratelly with C 711
(36)
. Then
connect on trimmer C 709 (3...15 pF) (SSB switch "up"), turn fine tune
to the left. Stop and adjust for zero beat again with C 709
(38)
. The
frequency deviation of the SSB variometer is approx. ± 1 kHz.
Because of the ceramic oscillator and the ceramic filter 19203-
023.97, the SSB section may be aligned only when fitted in the
complete chassis. The oscillating voltage at the emitted of transistor
T 703 is approximately 60-70mV.
V. FM Matching
Unless otherwise specified, it occurs in the mono switch position,
with AFC and muting off and with a correspondingly low HF level in
each case in order to prevent limitation and thereby avoid incorrect
adjustment.
1. Setting the tuning voltages
At MP 302, on slider S of the tuning resistor R 349 (19701-037.03)
with the FM button pressed, and with the FM pointer at the right
end of the scale, adjust the voltage with R 341 (10Kohm) to 30 V
±0.1 V. And with the FM pointer at left side of the scale, set R 348
to 2.1 V ± 10 mV.
Then press a station button (e.g. FM 1) and set a voltage of 2.1 V ±
10 mV with R 346 at point A MP 301 of the tuning controller 19703-
024.01.
