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Tuning lnstructions for CT 7060
Signal source
Equipment
setting
Signal source setting
Connection of
measuring Instrument
Item to be tuned
Tuning, Remarks
FM oscillator
108 MHz
DC voltmeter
to TP 1
L 10
8.3 V DC ± 0.2V
87.5 MHz
Check: 2.0 - 2.5V DC
FM IF, Input circult
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
Harmonic detector
oscilloscope to
AF output
T 101
AF maximum
T 102
T 103
AF and harmonic distortion
minimum
90 MHz
Tune to approx. 90 MHz
L 1/L 2, L 3/L 4, L 5
AF maximum
105 MHz
Tune to approx. 105 MHz
TC 1, TC 2, TC 3
Repeat input-circuit tuning
FM IF (fine tunIng)
Antenna to
75-ohm
antenna input
Receive strong
FM transmitter
at its nominal
frequency
DC voltmeter to:
TP 2 - TP 3
T 103
Determine DC maximum and
DC minimum
T 103
Adjust power mean
T102
OV±1 mVDC
Repeattuning
Pilot frequency 76 kHz, channel separation
FM signal generator to
75-ohm
antenna input
Frequency with-
out transmitters
approx. 98 MHz
Waveguide
shutter key: OFF
Tune to approx. 98 MHz,
Shift ± 40 kHz,
Mod. 1 kHz, 1 -2 mV,
without pilot tone
Frequency counter
to TP 5
VR 301
76 kHz ± 50 Hz
with 19-kHz pilot
AF voltmeter,
oscilloscope to
AF output
VR 302
Maximum channel separation
Suppresslon of residua pilot frequencles (19 kHz)
FM signal generator to
75-ohm
antenna input
Frequency with-
out transmitters
approx. 98 MHz
Frequency without
transmitters
Tune to approx. 98 MHz
1 -2 mV, 19-kHz pilot
ON
AF voltmeter,
oscilloscope to
AF output
T 302 (left channel)
Minimum
T 301 (right channel)
Search threshold, FM signal Indicator
FM signal generator to
75-ohm
antenna Input
Frequency with-
out transmitters
approx. 98 MHz
Tune to approx. 98 MHz,
Shift ± 40 kHz,
Mod. 1 kHz 10 µV
Check the display
VR 101
"TUNED" display must light up
VR 102
Eighth signal bar must light up
AM oscIllator
522 kHz
DC voltmeter to
TP 1
T 201
0.65V DC ± 0.05V
1611 kHz
TC 203
9.0 V DC ± 0.4V
153 kHz
T202
1.6 VDC±0.05 V
279 kHz
TC 204
5.4 V DC ± 0.4 V
AM IF, Input circult
AM signal generator to
75-ohm
antenna input
999 kHz
20 µV - 1 mV, 1 kHz
Mod. 30%
999 kHz
AT voltmeter,
oscilloscope to
AF output
T 203, T 204
Maximum
594 kHz
594 kHz
AM ferrite-rod
antenna
1404 kHz
1404 kHz
TC 201
162 kHz
162 kHz
LW ferrite-rod
antenna
252 kHz
252 kHz
TC 202
AM Signal indicator
AM signal generator to
75-ohm
antenna Input
999 kHz
100 µV, 1 kHz
Mod. 30%
999 kHz
Check the display
L
VR 201
Eighth signal bar must light up
3
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