Teac T-X150 - General Notices; Measuring Equipment

-X150
4 ALIGNMENTS
4-1 GENERAL NOTICES:
1. As for indicating antenna input voltage in dB, 0 dB is referenced to 1 nV
unless otherwise specified.
2. Make sure that the T-X150 is properly set for the voltage in your locality.
3. In the alignment procedure charts, the instruction in the SETTING column
at each step is continued from the previous step unless otherwise
specified.
4-2 MEASURING EQUIPMENT
FM signal generator (SG)
Stereo modulator
AM signal generator (SG)
Test loop antenna
lmpedance-matching network
Frequency counter
AC voltmeter
DC voltmeter |
A differential voltmeter is preferable.
Oscilloscope
Distortion meter
a
a
4-3 FM SECTION
NOTES ON TEST SETUP AND ALIGNMENT PROCEDURE CHART
The relationship between output level indication (dB) of FM SG (signal
generator) and tuner's antenna input power (dBf) under the condition shown
in Fig. 4-1 is as follows: —
A. When the FM SG level indicator shows the open-end output voltage (dB)
dBf = FM SG level indication (dB) — 6.8 dB
FM SG level indication (dB) = dBf + 6.8 dB
STEREO
MODULATOR
FM SIGNAL 750 IMPEDANCE-MATCHING
GENERATOR NETWORK
FM ANT
B.
When
the
FM
SG
level
indicator
shows
the
matched-end
output
voltage
(dB)
dBf
=
FM
SG
level
indication
(dB)
=
0.8
dB
FM
SG
level
indication
(dB)
=
dBf
+
0.8
dB
The
FM
section
chart
applies
the
principle
stated
in
A.
For
example,
if
the
antenna
input
power
of
the
tuner
(dBf)
is
65
dBf,
the
FM
SG
level
indicator
will
read
71.8
dBf
=
72
dBf.
AC VIVM
75Q (EUROPE)
3000 (Others)
OUTPUT
TUNER
:
aoe
OSCILLOSCOPE
DISTORTION
METER
Fig. 4-1 Test setup for FM section alignment
Initial tuner settings:
FM/AM function selectors: FM
‘ MONO
ADJUSTMENT POINT
4-3-1 FM MONO ALIGNMENT
ITEM SETTING -
1 FM tracking Roe
MONO/ST
e Stereo modulator
Modulation frequency: 1 kHz
Modulation level: 100% (75 kHz)
OUTPUT MODE sw: MONO
¢ FM SG:
Freq.: 98 MHz
Modulation level: 100% (75% kHz)
2 FM sensitivity
and distortion
e T-X150:
Connect DC voltmeter
between P3 and P4
Level indication: 72 dB (Tuner ANT input: 65 dBf)
IFT-302 Between P3 and P4
MEASURING POINT
No adjustment required.
DC voltmeter: OV