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Tuning Instructions CT 3560
Signal source
Equipment
setting
Signal source setting
Connection of
measuring instrument
Item to be tuned
Tuning, remarks
1) FM oscillator
87.5 MHz
DC-Voltmeter
to VCO FM/MW
Air coil L 3
1.6V DC ± 0.05V
108 MHz
Check
ca. 8V DC
2) FM IF input circuit
FM signal generator
to 75 ohm
antenna input
Frequency with-
out transmitters
approx. 98 MHz
0-1 mV, Shift ±
40 kHz, Mod. 1 kHz
Tune to approx. 98 MHz
Harmonie detector
oscilloscope to
AF output
T 1, T 202
AF maximum
T 201
AF and harmonie
distortion minimum
approx. 90 MHz
Tune to approx. 90 MHz
Air coils L 1, L 2
AF maximum
3) FM IF (fine tuning)
Antenne to 75 Ohm
antenna input
Receive strong
FM transmitter
at its nominal
frequency
DC voltmeter
to TP M and N
T 201
Determine DC maximum and
DC minimum
T 201
Adjust power mean
T202
OV± 10 mVDC
Repeat tuning
4) Mono-stereo-switching, scanning treshold, channel separation
FM Signal
generator to
75 ohm
antenna input
Frequency
without
transmitters
approx. 98 MHz
Mono key: OFF
Tune to approx.
98 MHz, Shift ± 40 kHz,
Mod. 1 kHz
19 kHz pilot ON
5 µV
Check the display
VR 202
"STEREO" display must
light up
1 mV
AF voltmeter,
oscilloscope
to AF output
VR 301
Maximum channel
separation
5) Suppression of residual pilot frequencies (19 kHz)
FM Signal
generator to
75 ohm
antenna Input
Frequency
without
transmitters
approx. 98 MHz
Tune to approx.
98 MHz
1-2 mV,
19 kHz pilot ON
AF voltmeter,
oscilloscope
to AF output
LPF 301 (RC)
Minimum
LPF 302 (LC)
6) AM oscillator
AM 522 kHz
DC voltmeter
to TP: VCO FM/AM
L 105
1.6V DC ± 0.05V
AM 1611 kHz
TC 103
8.3 V DC ± 0.1 V
LW 146 kHz
DC voltmeter
to TP: LW
L104
7.5 V DC ± 0.1 V
LW 290 kHz
TC 104
18VDC± 0.2V
7) AM IF, Input circuit
AM signal
generator
to AM antenna input
AM 999 kHz
20 µV-1 mV, 1 kHz
Mod. 30%
999 kHz
AF voltmeter,
oscilloscope
to AF output
T 101
Maximum
AM 603 kHz
603 kHz
L103
AM 1404 kHz
1404 kHz
TC 101
LW 164 kHz
164 kHz
L102
LW 254 kHz
254 kHz
TC 102
Repeat tuning
3
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